sendmail/procmail

About

Instructions which actually worked for configuring sendmail to deliver through procmail are here. Note the following:

• "dnl" at the end of a command is optional, if there are no comments following it (it apparently means "delete from here to the start of the next line")
• The "FEATURE(`local_procmail',`/path/to/procmail')dnl" line must go before the existing "MAILER(`local')" line
• Be sure to restart sendmail after applying the change. (If not using Webmin to do the editing, also be sure to rebuilt the sendmail.m4 file.)

Notes

From the mailers documentation:

This is designed to be used in mailertables. For example, a common question is "how do I forward all mail for a given domain to a single person?". If you have this mailer defined, you could set up a mailertable reading:

host.com	procmail:/etc/procmailrcs/host.com

with the file /etc/procmailrcs/host.com reading:

:0	# forward mail for host.com
! -oi -f $1 person@other.host

This would arrange for (anything)@host.com to be sent to person@other.host. Within the procmail script, $1 is the name of the sender and $2 is the name of the recipient.

If you use this with FEATURE(`local_procmail'), the FEATURE should be listed first.

Of course there are other ways to solve this particular problem, e.g., a catch-all entry in a virtusertable.

Links

• Invoking procmail from sendmail: this seems to be about how to forward mail to procmail on a shared server, rather than how to configure sendmail to filter all mail through procmail
• PROCMAIL_MAILER_PATH parameter
  • MAILER parameter
  • features: see "local_procmail" parameter
• FAQ: Version 8 issues seems to have some procmail examples