TMDA Pre-Configuration

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1. > |  | ### TMDA Pre-Configuration You may need to make some system-wide configuration changes to your MTA software depending on which one you are running (in order of ease): [ qmail/Courier | Postfix | Exim | Sendmail ] #### MTA Configuration (qmail and Courier) No changes need to be made to your configuration in order to use TMDA. #### MTA Configuration (Postfix) Enable the recipient_delimiter parameter in Postfix's main.cf if it isn't already. The Postfix default is `+` but `-` is an acceptable value as well. Just make sure it matches RECIPIENT_DELIMITER in your tmda/config. #### MTA Configuration (Exim) Edit your Exim run time configuration file as follows: ##### MAIN CONFIGURATION TMDA uses sendmail's `-f' option to set the envelope sender address on outgoing messages. By default this option is only available to Exim's "trusted users". You can also add untrusted_set_sender = true to your Exim configuration which allows untrusted users use of the -f command line option. It is recommended that you enable this option or become a trusted-user, or else the client side of TMDA becomes much less functional. ##### DIRECTOR/ROUTER CONFIGURATION TMDA is heavily based on user "extension addresses" (e.g, username+extension@domain.dom), and your Exim must be able to understand them. It doesn't by default. Both `+` and `-` are an acceptable values for the suffix, just make sure it matches RECIPIENT_DELIMITER in your tmda/config. Add the following lines to both the userforward and the localuser directors if they are not there already:
   >     suffix = -*
   >     # or "+*" if you prefer "user+suffix" addresses
   >     suffix_optional
2. > NOTE: If you are running Exim version 4.x, use local_part_suffix and local_part_suffix_optional instead. ##### TRANSPORTS CONFIGURATION TMDA receives much of its information about the envelope of an incoming message from environment variables set by the MTA. Most importantly, SENDER (the full envelope sender address), RECIPIENT (the full envelope recipient address), and EXT or EXTENSION (the recipient address extension). Exim currently sets only the first, so you must set the other two using the environment pipe option. You must also have Exim add a Return-Path: header to the message which it doesn't do by default. Do this by enabling the return_path_add transport option. Set return_path_add and environment as follows under the address_pipe transport:
   >     address_pipe:
   >       driver = pipe
   >       return_fail_output
   >       return_path_add
   >       environment = EXTENSION=${substr_1:$local_part_suffix}:\
   >                     RECIPIENT=$local_part$local_part_suffix@$domain
> #### MTA Configuration (Sendmail) TMDA receives much of its information about the envelope of an incoming message from environment variables (usually set by the MTA). Most importantly, SENDER (the full envelope sender address), RECIPIENT (the full envelope recipient address), and EXT or EXTENSION (the recipient address extension). The main difficulty with using TMDA under Sendmail, is that Sendmail does not provide such variables as the other three supported MTAs do. In fact, it does not provide any envelope information to commands run from a .forward file. In order to be reliable, TMDA needs these real sender and recipient values. It can't rely on what might be in the To: or From: headers. So in order to use TMDA, you need some way to obtain the necessary envelope information and set the above mentioned environment variables. It matters not how you do this, just as long as these variables are properly set by the time TMDA sees the message. TMDA expects these variables to be in the following format:
>     SENDER=sender@domain.dom
>     RECIPIENT=recipient@domain.dom
>     EXTENSION=foo
1. > That is, just the e-mail address or recipient address extension, with no trailing or leading whitespace, or any other extraneous characters. If your Sendmail installation is using procmail as its local mailer, the necessary information is passed as a command line argument to procmail, typically introduced by the "-a" flag. Your .procmailrc will then be able to construct the environment variables from this argument. The necessary Sendmail configuration changes are covered below, and a sample .procmailrc is given in the next section. Make sure procmail is installed on your server, and then add the following rule to your sendmail.mc file if it is not already present (most Linux distributions already define this!):
   >     FEATURE(`local_procmail', `/usr/bin/procmail')
Now run sendmail.mc through m4 to produce your new sendmail.cf file, and restart Sendmail so the changes will take effect.