Courier MTA alternatives and similar software solutions
Based on the "Mail Transfer Agents" category.
Alternatively, view Courier MTA alternatives based on common mentions on social networks and blogs.
9.2 8.2 Courier MTA VS Postal✉️ A fully featured open source mail delivery platform for incoming & outgoing e-mail
4.7 7.9 L2 Courier MTA VS OpenSMTPDThis is official OpenSMTPD Portable repository. Forks, pull requests and other contributions are welcome!
1.1 0.3 Courier MTA VS LightmeterLightmeter uses GitLab, not GitHub -- find repos at: https://gitlab.com/lightmeter
* Code Quality Rankings and insights are calculated and provided by Lumnify.
They vary from L1 to L5 with "L5" being the highest.
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Courier Mail Server
The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open commodity protocols, such as ESMTP, IMAP, POP3, LDAP, SSL, and HTTP. Courier provides ESMTP, IMAP, POP3, webmail, and mailing list services within a single, consistent, framework. Individual components can be enabled or disabled at will. The Courier mail server now implements basic web-based calendaring and scheduling services integrated in the webmail module.
The Courier mail server's source code should compile on most POSIX-based operating systems based on Linux, and BSD-derived kernels. It should also compile on Solaris and AIX, with some help from Sun's or IBM's freeware add-on tools for their respective operating systems.
How to build
This is a shared repository by all Courier-related projects. Each project is in a separate subdirectory. Some additional setup is needed before hacking on the source code. All projects also pull a shared repository that contains modules that are shared by multiple Courier projects. If you want to hack the "courier" project, you must pull the shared repository into the courier/libs directory. Additionally, clean and smudge filters must be set up in order to properly support sysconftool-based configuration files.
To set up a project directory, run this script with two parameters:
- A) the project directory to set up.
- B) The URL to the shared library module git repository.
sh INSTALLME courier http://www.example.com/courier-libs.git
The URL for the shared library module is purposefully not given in this INSTALLME in case it changes in the future. If you're reading this INSTALLME, you should already know what it is.
Copyright 1998-2013 Double Precision, Inc. This software is distributed under the terms of the GNU General Public License. See COPYING for additional information.
How to debug
If you want to debug login troubles a nice trick is to save the "imaplogin" binary to "imaplogin.save" and replace it with a shell script: (debian path examples)
#!/bin/sh env >/tmp/imapd.environ DATE=$(date) echo "new imapdlogin $DATE from $TLS_SUBJECT_CN" >> /tmp/imap_chat_in.txt echo "new imapdlogin $DATE from $TLS_SUBJECT_CN" >> /tmp/imap_chat_out.txt exec tee -a /tmp/imap_chat_in.txt | usr/lib/courier/courier/imaplogin.debug "[email protected]" 2>>/tmp/imaplogin_errout.txt | tee -a /tmp/imap_chat_out.txt
Make sure your imaplogin process is executable and has write access to these files.
*Note that all licence references and agreements mentioned in the Courier MTA README section above are relevant to that project's source code only.