The Anti-Spam SMTP Proxy (ASSP) Server project aims to create an open source platform-independent SMTP Proxy server which implements auto-whitelists, self learning Hidden-Markov-Model and/or Bayesian, Greylisting, DNSBL, DNSWL, URIBL, SPF, SRS, Backscatter, Virus scanning, attachment blocking, Senderbase and multiple other filter methods Postal provides an HTTP API for easy integration with web applications, and an SMTP server for integration with existing applications and systems. Run on your own hardware Postal is free and open source. Download the source code and run it on your own Linux servers Sentrion is not for everyone, but if you are using open source email for a large complex environment and need an enterprise platform that will enable your messaging roadmap for years to come (virtualization, consolidation, cloud migration, etc.), speak with a specialist to see if Sendmail Sentrion is right for you Your James server can also be used as Mail Transfer Agent, by enabling only SMTP or as a IMAP Mail Delivery Agent.. james general architecture using james as smtp relay using james as an imap server Click here to see how-tos for some James features James is a living Open Source project (all developments and implementations are based on open technical standards), any function which is not.
There is a lot of open-source SMTP servers available in the market. But to find a free SMTP server is kind of hassle. Personally I have used some of them. I have mentioned below, you can check their scalability: Pepipost: 30,000 emails for the first month for free. MailJet: 6,000 emails/month for free. SendinBlue: 9,000 emails/month for fre Postal is a complete and fully featured mail server for use by websites & web servers. Think Sendgrid, Mailgun or Postmark but open source and ready for you to run on your own servers. Postal was developed by aTech Media to serve its own mail processing requirements and we have since decided that it should be released as an open source project for the community Hedwig Mail server . An open source IMAP, SMTP server written in Java, designed with ease of installation and configuration in mind. Hedwig enables storage of mail message headers in a relational database (MySQL) and mail messages in a file system. Download. MachiNET Mailserver . Machinet mailserver is primarily meant for a small enterprise mail server using standard GPL components. Download. SMTP parameters to find your SMTP server address. An SMTP server is the machine that takes care of the whole email delivery process: that's why to send your messages with an email client or software you need first of all to configure the correct SMTP settings - in particular, the right SMTP address you're using. (For instance, Gmail's is smtp.gmail.com) Famous Open Source SMTP servers. Exim. Exim has been out since 1995, and growing in popularity ever since. The biggest strength of Exim is it's almost infinite level of customization. Exim supports the ability for a server administrator to create a custom ruleset that handles incoming and outgoing emails in any particular manner. For instance, it is easier with Exim to create a custom rule.
Most popular free SMTP server list to use a public SMTP server to send emails. SMTP server required while you send personal emails or business emails and email marketing. On the internet there are a lot of companies offer free SMTP servers, few of them are very famous like gmail.com, yahoo.com, hotmail.com, outlook.com, aol.com, zoho.com, mail.com, gmx.com, etc Some of the most popular open source email server which you can use to send or receive emails are as follows: 15 Best Free Open Source Software To Set-up Email Server For Windows 1. Open-xchange . Open-xchange comes in a variety of versions but the community version is the one which is free for all users. There are various other servers such as hosting and server edition as well as there is a. All such figures are necessarily estimates because data about mail server share is difficult to obtain; there are few reliable primary sources—and no agreed methodologies for its collection. Surveys probing Internet-exposed systems typically attempt to identify systems via their banner, or other identifying features;  and report Postfix and exim as overwhelming leaders, with greater than. Alternatives to Microsoft SMTP Server for Linux, Mac, Windows, BSD, Web and more. Filter by license to discover only free or Open Source alternatives. This list contains a total of 13 apps similar to Microsoft SMTP Server. List updated: 4/19/2018 3:01:00 P I got that working and enabled SMTP through my provider. I can send a test email with:./console swiftmailer:email:send -from firstname.lastname@example.org -to email@example.com -subject Test -body Test -mailer mailer_# I receive the Test email in my inbox almost immediately, but when I create a user agent or click forgot password, I get NO emai
hMailServer - Open Source Mail Server for Windows with POP3, SMTP, IMAP, AntiVirus/AntiSpam and more Introducing hMailServer, an Open Source Mail Server for Windows with POP3, SMTP, IMAP, AntiVirus/AntiSpam and more. August 15, 2018 - by Dark - Leave a Comment 2.8K . Share Tweet Pin It Share. Table of Contents. Overview; Installation. Choose the Database; Connect hMailServer to the Database. Open relay means the SMTP server is routing both messages from external sources and internal server mail, while closed relay only routes messages generated on the internal network or server. By its nature, open mail relay is more expansive, but it can also be more vulnerable to spam abuse Hedwig Mail Server - The Open Source IMAP/SMTP/POP3 Server for Java. Hedwig is an open source IMAP, SMTP, POP3 server written in Java, designed with ease of installation and configuration in mind. Hedwig enables storage of mail message headers in a relational database and mail messages in a file system. Currently MySQL and Oracle can be used as. A full-featured mail server solution based on Postfix and Dovecot: The right way to build your mail server with open source softwares. It Works on Linux and *BSD family of operating system. You can setup mail server in several minutes. End users are forced to use mail services through secure connections (POP3/IMAP/SMTP over TLS, webmail with.
Use your smartphone to choose a subdomain and install the email server app on the Raspberry Pi 3. Server applications (such as email servers) are broken into multiple containers, which can only communicate with the outside world and each other in declaratively specified ways, using fine-grained isolation to improve security. For example, incoming SMTP, SpamAssassin (anti-spam platform. In order to connect your WordPress site or email client to the SMTP server, you need to enter a specific SMTP port. There are four common SMTP ports: 25; 587; 465; 2525; Port 25 is commonly used for SMTP relay, but you should not use it for SMTP submission because most providers block it. If you want to configure your WordPress site or email client to use SMTP, you should start with port 587. Popular free Alternatives to Microsoft Exchange Server for Linux, Windows, Web, Self-Hosted, Mac and more. Explore 20 apps like Microsoft Exchange Server, all suggested and ranked by the AlternativeTo user community The author selected the Free and Open Source Fund to receive a donation as part of the Write for DOnations program.. Introduction. Postfix is a mail transfer agent (MTA), an application used to send and receive email. It can be configured so that it can be used to send emails by local application only. This is useful in situations when you need to regularly send email notifications from your.
I am planning on spinning my own mail server at home. I hope setting it up will help strengthen my linux skills and i just want to host my own domain mail server instead of entrusting it to Bluehost. In your experience, what is the best Linux mail server that one can spin at home? This is for a home lab, where i experiment a lot I will show you in this video. how to create a free SMTP server to send unlimited bulk emails from your own server for free using an open-source free SMTP ma.. An open source SMTP server can be used as a standalone server to process mail for a network, or it can be a single part of a larger application or server setup. Not all SMTP servers can be easily integrated with other applications, and that ability is important to look for if it is required. Certain open source servers have support for plug-ins or have source code available that is easily. SMTP, as you might know, stands for Simple Mail Transfer Protocol which is a protocol used for sending and receiving emails over the network. So how SMTP works is that when you send an email, its server breaks it down into its relevant parts. This helps move it from your email client to your recipient's email client
Simple Mail Transfer Protocol (SMTP) allows your Magento 2 store to send email through a specific third-party mail SMTP server. You can configure your Magento store to use your Gmail, Amazon, Microsoft or any other mail server account to send all your emails. All you need is to configure the mail server settings in our Magento extension. Extension Support. Like all other open source projects. When running your own mail server you have complete control over its performance and reliability. Here is how to get started with an open-source mail server on AWS EC2. Related: How to install a web server on AWS EC2 and set up a website from scratch on a domain of your choice. Running a mail server on AWS EC2 is not quite as easy as it sounds. Open Source email server. Regain your independence and protect your privacy by installing your own email server. It takes less than 10 minutes! Know more Create your mail server for free in less than 10 minutes with Modoboa. When it comes to create a mailbox, you generally have several solutions: use the services offered by Internet providers (Orange, Vodafone...) of infrastructure providers. Then right click the email account in Thunderbird, click Settings menu item. Then click the Outgoing Server menu item in left panel, and add the python built-in smtpd server in right panel like below. And set it as the default outgoing server Open Source Home @Mail Server - @Mail can help streamline your business messaging solutions, provide your customers an improved Webmail platform, and offer you a reliable and stable email-server infrastructure. Provide your customers an improved Webmail interface for their existing POP3/IMAP account. Offer more then the standard open-source or simple Webmail interface that any ISP can provide.
Pour configurer les paramètres SMTP authentifiés utilisés par les clients POP3 et IMAP4, suivez les étapes suivantes : Configurez le nom de domaine complet sur le connecteur de réception « Server name frontal du client ». Configurez le nom de domaine complet sur le connecteur de réception « frontal du client <Server name> » hMailServer - Mail Server open-source per Windows con gestione POP3, SMTP, IMAP, AntiVirus/AntiSpam e altro 17 Dicembre 2015 15 Agosto 2018 - by Ryan - 1 Comment 5.5K Share Tweet Pin It Shar
. how to create a free SMTP server to send unlimited bulk emails from your own server for free using an open-source free SMTP mail server called postalhq iRedMail is a fully fledged, full-featured mail server solution. It uses open source packages like Postfix, Dovecot, Apache, MySQL, OpenLDAP, Amavisd, RoundCube etc to provide this solution. email email-solution mail-server smtp pop3 imap software-bundle webmail Postfix - Mail Server. C; Postfix is mail server that started life at IBM research as an alternative to the widely-used Sendmail. Creating your secure mail server is not always easy It's easy to miss a setup and turn your server into an open SMTP relay for the world, or get spammed over. So be sure to follow this tutorial precisely and then monitor the system logs to make sure that you are the only one doing the actions that are happening on your server Postfix SMTP server. Introduction . Postfix, being an open-source MTA (mail transfer agent), has gained a lot of attention after Sendmail. The functionality of both is the same — they are used. SMTP Extension for Magento 2 helps the owner of store simply install SMTP (Simple Mail Transfer Protocol) server which transmits the messages into codes or numbers. Through it, messages will be delivered directly and automatically to the chosen customers. SMTP For Magento 2 Features : Send email through virtually any external SMTP server from your Magento store. Easily configure Magento 2 SMTP.
this is an easy to use extension that works well with relaying email through a 3rd party SMTP mail server. Initially, I tried it with Gmail, although it works, using Gmail for Magento store isn't optimal, so I switched to using Mailchimp's Mandrill paid service, it works a lot more reliably, and emails no longer gets filtered as junk mail. Thank you for the wonderful extension. Jerry-Verified. Yandex Mail SMTP Server for WordPress allows you to configure and send all outgoing emails via a Yandex SMTP server instead of PHP mail(). This will guarantees delivery of your emails also prevent your emails from going into the junk/spam folder of the recipients. * Note yandex mail account required
E-Mail-Client und News-Reader, erlaubt das Anlegen mehrerer E-Mailkonten und Verbindungen über SSL über POP3, SMTP, IMAP4rev1 und NNTP Lizenz: Open Source The author selected the COVID-19 Relief Fund to receive a donation as part of the Write for DOnations program.. Introduction. A little-known feature of Gmail and Google Apps email is Google's portable SMTP server. Instead of having to manage your own outgoing mail server on your DigitalOcean Droplet or Kubernetes Cluster, you can configure Google's SMTP server settings with whatever script. They provide open-source libraries in 7 languages, and a clear set up to help you send emails right away. You can access Email templates with HTML rendering and conditional formatting with testing previews. Get results in real-time to catch address typos present in-form, bounce fewer emails, and improve on your email sending reputation-Email Validation. Also Read: Pepipost SMTP V/S Sendgrid. G Suite allows you to use Google SMTP servers to send out emails which means you can set up an email account for your WordPress site and then use it to send WordPress emails. However, it is only suitable for small business websites and blogs because it can only send 2,000 messages a day. For details see our article on how to set up a professional email address with G Suite. Pricing: Starts.
Quels sont les serveurs web open source Technologie : Ils sont indispensables à la réussite de vos projets web. Voici 5 serveurs web qui valent la peine, à tout le moins, d'être essayés. .2). The Zimbra Open License Community Zimlets Code is released under the Common Public Attribution License, version 1.0 (CPAL v.1). Versions prior to version 8.5 will remain under the Zimbra Public License 1.4. By moving to OSI-approved licenses, Zimbra hopes to increase contributions from. Zimbra Collaboration Open Source Edition provides great features for administration and to the end users. It has an excellent 'web' version. Many people find it their favorite way to use email after trying it for awhile, even if they were used to another program like Outlook or Thunderbird other than its features like a calendar and task function to help coordinate schedules and plan meetings etc Some of the mail servers, including mail.rsilsware.com, support PIPELINING. It means that the SMTP mail server will wait until the DATA command is issued before responding to any other commands after the EHLO command. Enter the MAIL FROM, RCPT TO, and DATA commands before waiting for a response in this case. Try Mailtrap for Free. Online services for testing SMTP servers. For the beginning. Outlook.com SMTP server settings are needed to set up your Outlook.com account in an email client on your smartphone, tablet, or another computer. SMTP settings provide instructions to the mail program on how to send mail from your Outlook.com account
unlimited smtp smtp server open source smtp for sale smtp scanner local mail server smtp server freeware smtp domain vps with cpanel smtp send mail vps hosting free. Search: Recent Posts. Fedex Account with perfect money; Apple Account with perfect money; Alibaba Account with perfect money; USA RDP Windows Server 2008,2012 with perfect money ; AU RDP Windows Server 2008,2012 with perfect money. It's an SMTP server written in Go, for the purpose of receiving large volumes of email. It started as a project for GuerrillaMail.com which processes millions of emails every day, and needed a daemon with less bloat & written in a more memory-safe language that can take advantage of modern multi-core architectures
iRedMail 0.7.0: Open Source Mail Server With Postfix, Dovecot, Amavisd, ClamAV, SpamAssassin, RoundCube On Debian Squeeze (Debian 6.0) iRedMail is a shell script that lets you quickly deploy a full-featured mail solution in less than 2 minutes. Its object is to make a Linux mail server installation and configuration simple, painless and easy to use. Most components used in iRedMail are. hmailserver est un serveur de messagerie open-source et gratuit pour windows. il supporte tous les protocoles d'email communs (imap, smtp, pop3) et fournit une librairie com qui peut être utilisée pour l'intégration avec d'autres applications. il supporte également les noms de domaine virtuels, les listes de distribution, le scan antivirus, antispam, alias, domaines distribués et beaucoup.
Debug mode emulates the work of the email SMTP server and keeps a detailed log. If any mistakes occur you will see them in the log and make the necessary changes without reconsidering all the settings. When everything works correctly, you can clear the log manually or it will be cleared automatically after a certain period of time (in days). Log With Detailed Email Content. The extension keeps. 3rd Party Open Source Code; Product Downloads; Support; Progress Notifications ; More. How to configure SMTP e-mail in IIS 8. Apr 16, 2020 • Knowledge. Article. Title. How to configure SMTP e-mail in IIS 8. URL Name. How-to-configure-SMTP-e-mail-in-IIS-8. Article Number. 000191763. Description. How do I configure SMTP e-mail in IIS 8? Solution. When you need to add a SMTP server to the. . So far, though, it's choking on authentication with yahoo pop server, despite it claiming to have TLS support ABOUT SMTP DIAGNOSTICS. This test will connect to a mail server via SMTP, perform a simple Open Relay Test and verify the server has a reverse DNS (PTR) record. It will also measure the response times for the mail server. If you don't know your mail server's address, start with a MX Lookup An SMTP server that works as an open relay, is a email server that does not verify if the user is authorised to send email from the specified email address. Therefore, users would be able to send email originating from any third-party email address that they want. The checks are done based in combinations of MAIL FROM and RCPT TO commands. The list is hardcoded in the source file. The script.
SMTP Server Settings for Yahoo Mail . The SMTP server settings apply to outgoing mail, so they're the same whether POP or IMAP is used for incoming email. In most cases, enter the SMTP settings in the Settings section of the client interface when you add the Yahoo account to it SMTP POP3 IMAP SMTP sur TLS POP sur TLS SSL Webmail Base de données Système de fichiers Oui Apache James Oui Oui Oui Oui Oui Oui Oui ? Non Non Oui Oui Non Open Source/ASLv2: BlueMind Oui Oui Oui Oui Oui Oui Oui Oui Oui Oui Oui Oui Oui Open Source / AGPL v3: ContactOffice Oui Oui Non Oui Oui Oui Oui Oui Oui Oui Oui Oui Non Propriétaire Courier Mail Server Oui Non Oui Oui Oui Oui Oui Oui Oui. 7 Free SMTP Server Solutions to Use with WordPress in 2020. Here are the free SMTP providers that we'll cover - keep reading for more detail on each tool: Gmail SMTP Server. You probably already know Gmail for its free email offering. However, Google also lets you use Gmail as an SMTP server to send emails from your website This article outlines ways to determine the source of spammers abusing the server. DETAIL. If someone abuses the server by relaying spam through it, whether they have guessed a users password, or the relay configuration allows it, the following will likely give an indication of this: SMTP and MTA log sizes will be a lot larger than usual SMTP outgoing mail queue full of messages waiting for. Ebitec's JMS Mail bridge is a software product that interfaces between traditional e-mail protocols (SMTP, POP) and a JMS server. The Ebitec Mail Bridge is independent of JMS server vendor and therefore easily integrated into your existing systems. Advanced features are included such as processing different types of e-mail with multiple attachments, encode e-mail into XML, and support for.
. If you want more latest PHP projects here. This is simple and basic level small project for learning purpose. Also you can modified this system as per your requriments and develop a perfect advance level project. Zip file containing the source code that can be extracted and then imported into notepad++. This. The attached open source C# .NET library is an SMTP client implementing implicit SSL and OAuth2 protocols. The library answers the question: how to send email message using Gmail as a server. Or, how to send email message using email server that implements implicit SSL and port 465 SeaMonkey is another free open source email client software for Windows, macOS, and Linux. This email client comes with all in one internet application suite. In it, you can find all essential email client functions like compose mail, inbox, draft, outbox, etc. Plus, it is also quite simple to use. The main problem with this software is its interface that looks quite dated Libres & Open Source OpenOffice & LibreOffice Projets J'arrête bien SMTP et le démarre bien toujours depuis Operation Navigator Mais quand je fais la commande : WRKACTJOB JOB(SMTP*) je n'ai rien qui tourne Avec la commande WRKACTJOB (QMSF) j'ai bien un travail qui tourne pour le Mail Server Framework Quelqu'un peut-il m'aider ? Merci Répondre avec citation 0 0. 12/11/2008, 21h34 #2. It uses a POP3 or IMAP servers as the mailstore and sends mail through a SMTP server. It is very simple to configure (only a few settings in the web.config file). You can compose HTML messages, search your inbox, read complex mime messages, have multiple address books and much more. webmail web-mail smtp mail-client pop3 imap mail-store K-9 Mail - Advanced Email for Android. Java; K-9 Mail.
Without an SMTP server, your email wouldn't make it to its destination. Once you hit send, your email transforms into a string of code that is then sent to the SMTP server. The SMTP server is able to process that code and pass on the message. If the SMTP server wasn't there to process the message, it would be lost in translation. Additionally, the SMTP server verifies that the. The email provider also gives you access to fast email delivery and detailed analytics to monitor your open and click-through rates . account to deliver personalized transactional emails through an SMTP email server. While Mandrill doesn't have a free plan, there's a transactional email demo you can utilize to send automated emails. The SMTP relay server also has a vast knowledge base. To send email reliably, you must use the SMTP server assigned to that email. If Post is unable to connect to the right SMTP server, you may have to ask your host to open the ports, or create a new email account managed by your host, or switch hosts! The Connectivity Test utility will tell you which ports are open and the actions available to you
The Mail server group installs Postfix (SMTP), and the excellent Dovecot for POP3 and IMAP4, which is a stout foundation for an on-site email server. Then add whatever additional services you want, such as a Webmail server, calendaring, shared contacts, discussion boards, file shares, and so on. Or you can install a prefab groupware suite on it an Open Source SMTP Server writen in C#. The goals are to be as high performance as possible, and allow for easy extensibility. Tags. No tags have been added In a Nutshell, SharpMail SMTP Server... No code available to analyze. Open Hub computes statistics on FOSS projects by examining source code and commit history in source code management systems. This project has no code locations, and so. Host: Host name or IP address of the remote mail server. This is the server to which the Enterprise Gateway forwards incoming SMTP commands (for example, stmp.gmail.com).You can also specify a mail server running locally on the same machine as the Enterprise Gateway using an address of localhost or 127.0.0.1 Mail (mailid) It will ask the subject. Enter the content you want to send. After completing, exit and end the mail by using a dot (.) Now your mail server is ready to deliver mails as per your needs. Also, you can use SMTP relay to allow a multifunction device, printer, or an application for sending e-mails by using Office 365 and Exchange Online The short names are used as username while authenticating with SMTP server. It should only contain letters, numbers, and hyphen. Once the organization is created, you will be asked to create a new mail server. Provide the name, short name, and mode of the email server. In Live mode, all emails are routed and delivered normally but in.
Free open source POP3/SMTP mail server with anti-spam and SSL support AfterLogic XMail Server is a free open source e-mail server. Supports ESMTP, TLS/SSL secure connections, SMTP authentication, account and domain aliasing, anti-spam features (IP-based and e-mail address based),mailing lists, logging, remote administration, Finger protocol, filters, custom mail processing, simultaneous multi. Bonjour, Dans la documentation Orange, il est dit: Compte de messagerie: Orange/Wanadoo adresse de messagerie: orange.fr / wanadoo.fr Serveur sortant: smtp.orange.fr Port sortant: 465 Envoi sécurisé: SSL Envoi authentifié**: OUI* *En mode authentifié, pour le choix du mot de passe pour le serveur sortant, sélectionnez dans votre application de mail mêmes identifiants que serveur entrant. Send mail via SMTP servers. The default mail command on the Linux terminal, uses the local smtp server (mta) on port 25 to send emails. However at times you need to specify an external smtp server to use for sending mails. For example you have just setup an smtp server, like Postfix or Exim, then you would want to test it out to check if it is receiving and relaying emails properly or not. Source: WP Mail SMTP. So you just go to the Settings page, choose a built-in mailer or Other SMTP if you use another provider. If you are going to send emails with one of the integrated providers, you will need to to your account and configure the minimum settings. When using an alternative server, you will have to enter: your SMTP hostname; SMTP port; encryption method ; username. Test SMTP Server. Setting up a new mail server?, Need to test that your SMTP server is configured correctly?. Use this tool to send a test email message directly to your mail server - it will log the full SMTP conversation in real-time, revealing any errors or exceptions raised by your SMTP server
Now, let's have a look at online tools you can efficiently test your SMTP server with. MX Toolbox - a simple service indicating such things, as SMTP Reverse DNS Mismatch, SMTP Valid Hostname, SMTP Banner Check, SMTP TLS, SMTP Connection Time, SMTP Open Relay, and SMTP Transaction Time for free. Note that it doesn't allow you to detect the. The steps to setup and configure an SMTP Server or mail relay on (127.0.0.1) relay permissions it means that only the server itself can relay mail. Conversely, it prevents the SMTP server from being an open relay and being used to send unsolicited spam email by other computers on the internet, which could lead to the SMTP server being blacklisted. 18. Next, go to the Messages tab. Here you. Every recent mail server is capable of doing the job with that minimal requirements you provide. You are sending only 800 mails per hour. This can be done in 5 minutes without pain. So check the server that fits your requirements. Any of Sendmail, Courier, Qmail, Exim or (my favorite) Postfix can do what you want. Without any problem. Edit Courier mail server's IMAP server, webmail server, and mail filter are available as independent packages that can be used with other mail servers (as long as the other mail servers store mail in maildirs). These sub-packages are assembled from the same source code tree. The only difference is the top level makefile. Note: the independent builds are not always in sync with the main th
This SMTP server can work as a mail relay service that should receive and send SMTP emails from various devices in the organization (for example, senders, scanners, access control devices, etc.) and applications (web apps, SQL Reporting Services, SharePoint), which should be able to send mail using the SMTP protocol. Such a relay can send messages to your Exchange servers or to public email. In order to do some mail processing before it ever gets to the mail client, we plan to implement a POP3 proxy solution. Ie, POP3 mail client would connect to the proxy instead of the actual POP3 mail server, and the proxy would do the actual connection to the mail server, process the incoming messages a little bit, and stream them to the mail. EmailArchitect Email Server. Platform: Windows 2000 or later (32bit/x64) SMTP, POP3, IMAP4, HTTP, Web Mail, SSL, TLS, DKIM, SDK. A full featured Windows Email Server which supports SMTP, POP3, IMAP4, LIST, SSL, HTTP, Ajax Webmail, RBLS, Anti-Spam, Anti-Virus, Greylisting, DomainKeys, DKIM, IDN, Archive and Plus Addressing. It provides you a. The SMTP protocol is used to send emails from a server (in this case, that of Online.net) to another (your destination). This protocol can be used to send mails, it can also be used to send SPAM. Because of this, some internet providers (for example: Orange, Free, and others) are therefore blocking the connection on port 25 to any SMTP server except their own