I am working on setting up a backup mx mailer for domain. It will be our first debian system we will be using for a main production system. I have read through the documentation, and it appears I have everything configured correctly. I am planning to set it up as a relay for an exchange server and a sendmail server. My original plan is to have it as a very high mx number like 99 and just verify it appears to be working on the few MTA's that attempt to relay through it. Am I missing any additional items I need to configure to keep addresses carrying over correctly to their destination machines?
I really appreciate any feedback you can give on items I might be overlooking. If you can think of ANYTHING I am overlooking, let me know. As you well know when the mailserver for 800 people stop working, people get ugly. I have read existing documentation on setting up a mail hub. If you know of any documentation you think I might find useful, then let me know. Ignore additional security items such as: dnsvalid/ipvalid,connection_throttle,bad_recip_throttle as I am aware of them. mailterable and sendmail.mc listed below: /etc/mail/sendmail.mc generated using sendmailconfig in sendmail stable. divert(0)dnl # # Copyright (c) 1998-2002 Richard Nelson. All Rights Reserved. # # This file is used to configure Sendmail for use with Debian systems. define(`_USE_ETC_MAIL_')dnl include(`/usr/share/sendmail/cf/m4/cf.m4')dnl VERSIONID(`$Id: sendmail.mc, v 8.12.3-6.6 2003-09-17 18:35:09 cowboy Exp $') OSTYPE(`debian')dnl DOMAIN(`debian-mta')dnl LOCAL_CONFIG FEATURE(`nocanonify')dnl LOCAL_CONFIG Cwtraffic.cs.montana.edu FEATURE(`use_cw_file')dnl FEATURE(`use_ct_file')dnl FEATURE(`nouucp', `reject')dnl FEATURE(`mailertable')dnl FEATURE(`smrsh')dnl FEATURE(`mailertable')dnl INPUT_MAIL_FILTER(`mimedefang', `S=unix:/var/spool/MIMEDefang/mimedefang.sock, F=T, T=S:1m;R:1m') include(`/etc/mail/dialup.m4')dnl include(`/etc/mail/provider.m4')dnl MAILER_DEFINITIONS MAILER(local)dnl MAILER(smtp)dnl LOCAL_CONFIG ## Custom configurations below (will be preserved) include(`/etc/mail/tls/starttls.m4')dnl define(`confLOG_LEVEL',`13')dnl define(`relay_hosts_only')dnl I have configured mailertable entries: FEATURE(`mailertable')dnl define(`relay_hosts_only')dnl /etc/mail/mailertable xxx.montana.edu esmtp:[xxx.montana.edu] xxx.montana.edu esmtp:[xxx.coe.montana.edu] /etc/mail/relay-domains xxx.montana.edu xxx.montana.edu -- --Luke CS Sysadmin, Montana State University-Bozeman
