esmtpacceptmailfor,esmtpacceptmailfor.dat- lists domains whose mail we accept.
esmtpgreeting - what smtpd announces as its
esmtphelo - what to announce in my HELO command.
Defaults to me.
esmtppercentrelay.dat - a GDBM database file. If
<user%foo@bar> is given, foo must be
in percenthack as the key. Which is then rewritten by smtpd as
<user@val>, where val is the value of that key
in the GDBM file, which can be created by makegdbm.
esmtproutes - If the host being delivered to is
found in this file, the value will be used instead of looking up
MX or A records. The value is a space/tab separated list of IP
addresses or hostnames.
esmtptimeout - general STMP timeout, in seconds.
Both smtpd, and the output module will stop after waiting the
specific amount for a response from the remote server.
rewritedel- if domain is of the form foo@bar, accept delivery for host bar, user foo@bar.
esmtp - compile-time options may be used to
specify various kinds of behavior when envelope recipient is
being rewritten by submit, including: check for mailbox validity
- this involves simply locating any loaded rewritedel function,
and failing otherwise (!); or forking and running an external
courieresmtpd is typically invoked by couriertcpd to handle incoming connections. courieresmtpd is a full-fledged ESMTP server. courieresmtpd reads ESMTP commands and runs submit to process incoming messages.
courieresmtpd reads BOFHNOEXPN and BOFHNOVRFY environment variables to disable the EXPN and VRFY commands.
The output module reads esmtproutes to check for any hardcoded smarthosts.