 | E-MailRelayE-MailRelay is a simple SMTP proxy and relay MTA, written in C++, for Linux and Windows. |
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E-MailRelay Description
E-MailRelay is a simple SMTP proxy and relay MTA, written in C++, for Linux and Windows. E-MailRelay is a simple SMTP proxy and relay MTA, written in C++, for Linux and Windows. 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, oftenonly 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 V3.Quick startTo 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 /tmpAnd then to forward the spooled mail to "smarthost" run something like this: emailrelay --as-client smarthost:smtp --spool-dir /tmpTo 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:smtpFor 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:smtpIf 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/addsigTo run E-MailRelay as a POP server without SMTP use "--pop" and "--no-smtp": emailrelay --pop --no-smtp --log --close-stderrThe "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 --verboseDocumentationThe 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 releasesSource code documentation will be generated when building from source if "doxygen" is available.ConfigurationsRecent releases were developed on Ubuntu Linux 7.10 using:· linux 2.6.22· gcc 4.1.3· autoconf 2.61and on Windows NT4 SP6 using:· MSVC 6.0 SP3The 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 2.52and on Windows 98 using:· MSVC 6.0Versions 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 3.4.2What's New in This Release:· Speed optimisations (as identified by KCachegrind/valgrind in KDevelop).· Build-time size optimisations (eg. "./configure --disable-exec --enable-small-exceptions ...").· Build-time options to reduce runtime library dependencies (eg. "./configure --disable-dns --disable-identity").· New switch to limit the size of submitted messages ("--size").· New semantics for "--poll 0", providing a good alternative to "--immediate" when proxying.· SMTP client protocol emits a RSET after a rejected recipient as a workround for broken server protocols.· SMTP client protocol continues if the server advertises AUTH but the client has no authentication secrets.· When a message cannot be forwarded the offending SMTP protocol response number, if any, is put in the envelope file.· A warning is printed if logging is requested but both stderr and syslog are disabled.· A cross-compiling toolchain builder script added for running on mips-based routers ("extra/mips").· New example scripts for SMTP multicasting and editing envelope files.· Improved native support for Mac OS X (10.5) with graphical installation from disk image.· Compatibility with gcc 2.95 restored.
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