Tests have been done under Linux with the Debian and the Red Hat distributions, both for the i386 platform, using 2.0.x and 2.2.x kernels. I have used sendmail 8.9.3. The Mail User Agent used for tests is mutt . Incoming mail is downloaded from the POP3 server using fetchmail and then dispatched to the appropriate folders by procmail . The latter is much more readable and editable than sendmail.cf .
Some lines deserve an explanation.
Lines 3 and 4 instruct sendmail to disable warnings emitted when the local mail queue cannot be flushed. Line 6 sets procmail as the mail delivery agent for incoming messages. Line 9 disables any special processing of UUCP addresses. Line 10 says that all the outgoing messages must be masqueraded to appear as sent by the host tin.it . Line 5 tells sendmail to rewrite the envelope sender of a message according to the rule activated by line 10.