@lbutlr wrote: > Linda Pagillo wrote: > > I want to set up Postfix as a backup MX for a few of my > > Windows-based mail servers. I have never done this before so I > > have been researching to see what I could find. > > Reconsider.
+1 to this. Back in the days when systems were not directly connected and the network was a friendlier place then relays were very useful. But these days with a globally connected Internet with every system being able to directly connect to every other system there is no need for relay systems like this anymore. > Backup MX servers are fiddly to maintain I would not describe them as fiddly. But there are a few important points that are absolutely critical. One critical item is that the relay_recipient_maps must be kept in sync across all of the systems. This is a problem that is okay if handled but even better if one avoids the need to handle it at all. You can't break what you are not using. > and work best when they are configured EXACTLY like the real server, > including with the exact same spam settings and backend data and > blacklists and firewalls. That is a very difficult thing to do, > especially if you're on a different platform (Windows vs Ubuntu). Strong agreement! For example I am not sure how one would even be able to synchronize relay_recipient_maps *from* a Windows server. > In general, a backup MX becomes nothing more than a server that is > constantly being spammed. It's definitely a target for spam. Which must be repelled. As spammers routinely target lower priority MX relays expecting to find them less well maintained than the highest priority one. Bob
