E-MailRelay Readme ================== Abstract -------- E-MailRelay is a simple SMTP proxy and store-and-forward message transfer agent (MTA). When running as a proxy all e-mail messages can be passed through a user-defined program, such as a spam filter, which can drop, re-address or edit messages as they pass through. When running as a store-and-forward MTA incoming messages are stored in a local spool directory, and then forwarded to the next SMTP server on request. Because of its functional simplicity E-MailRelay is easy to configure, typically only requiring the address of the target SMTP server to be put on the command line. E-MailRelay can also run as a POP3 server. Messages received over SMTP can be automatically dropped into several independent POP3 mailboxes. C++ source code is available for Linux, FreeBSD, MacOS X etc, and Windows. Distribution is under the GNU General Public License. Quick start ----------- To use E-MailRelay in store-and-forward mode use the "--as-server" switch to start the storage daemon in the background, and then trigger delivery of spooled messages by running with the "--as-client" switch and the address of the target host. For example, to start a storage daemon listening on port 10025 use a command like this: emailrelay --as-server --port 10025 --spool-dir /tmp And then to forward the spooled mail to "smarthost" run something like this: emailrelay --as-client smarthost:smtp --spool-dir /tmp To get behaviour more like a proxy you can add the "--poll" switch so that messages are forwarded continuously rather than on-demand. This example starts a store-and-forward server that forwards spooled-up e-mail every hour: emailrelay --as-server --poll 3600 --forward-to smarthost:smtp For a proxy server that forwards each message as it is being received, without any delay, you can use the "--as-proxy" mode: emailrelay --as-proxy smarthost:smtp If you want to edit or filter e-mail as it passes through the proxy then specify your pre-processor program with the "--filter" switch, something like this: emailrelay --as-proxy smarthost:smtp --filter /usr/local/bin/addsig To run E-MailRelay as a POP server without SMTP use "--pop" and "--no-smtp": emailrelay --pop --no-smtp --log --close-stderr The "emailrelay-submit" utility can be used to put messages straight into the spool directory so that the POP clients can fetch them. Note that by default E-MailRelay will always reject connections from remote machines. To allow connections from anywhere use the "--remote-clients" switch, but please consider the implications if your machine is connected to the internet. For more information on the command-line options refer to the reference guide or run: emailrelay --help --verbose Documentation ------------- The following documentation is provided: * README -- this document * COPYING -- the GNU General Public License * INSTALL -- build & install instructions (including the GNU text) * AUTHORS -- authors, credits and additional copyrights * copyright -- main copyright and GPL reference * userguide.txt -- user guide * reference.txt -- reference document * ChangeLog -- change log for releases Source code documentation will be generated when building from source if "doxygen" is available. Configurations -------------- Recent releases were developed on Ubuntu Linux 7.04 using: * linux 2.6.20 * gcc 4.1.2 * autoconf 2.61 and on Windows NT4 SP6 using: * MSVC 6.0 SP3 The code was originally developed on SuSE Linux 7.1 using: * linux 2.4.10 * gcc 2.95.3 * glibc 2.2.4 (libc.so.6) * autoconf 2.52 and on Windows 98 using: * MSVC 6.0 Versions of the code have also been built successfully on: * MacOS X 10.3.9 * FreeBSD on Intel hardware * Linux on Alpha hardware (Debian 2.2) * Linux on Sparc hardware * Linux on RS6000 PPC hardware * Solaris 8 using gcc on Sparc hardware * Solaris 8 using WorkShop 5.0 * Linux using intel c++ 6.0 * Windows NT 4.0 using MSVC 6.0 * Windows NT 4.0 using Cygwin (DLL 1.3.22) and gcc 3.2 * Windows NT 4.0 using MinGW 2.0.0 and gcc 3.2 * Windows XP using MinGW 3.1.0 gcc 3.4.2 Feedback -------- Please feel free to e-mail the author at "mailto:graeme_walker@users.sourceforge.net" or the SourceForge mailing list "mailto:emailrelay-help@lists.sourceforge.net".