Hi all,
I need to reject unknown 'local' users on my mx backup server (with
no local delivery). Spamers try to send spam to mx backup servers
directly, as they assume that those servers do not have as good
protection as primary mailservers.
They are right ;-)
Do yo have any suggestion how to implement this check in courier?
Mmmmmmmm, easier said than done. I think it can be done, but not very easily.
How about this. Make the secondary a primary as well, but the delivery instructions send it on to the real primary. Now you only need to replicate your userdatabase, but there are mechanisms for that.
Alternatively, make your domain a hosteddomain on the secondary. Regularly extract userdatabase, send over to secondary, convert to aliasdatabase. Alias all real users from <user>@domain.tld to <user>@mx1.domain.tld so they get sent on to the real primary.
A completely different solution that more and more people use is not have any backup MXen! Make all mailservers primary (same prio) and have them all on site. If any of them fails you're covered, another will take over. If your Internet connection fails, the sending server will hold the mail for just as long as a backup MX normally does, 4 days. People even use this scenario with only one primary mailserver and no others. On the outside this looks like a badly thought out strategy ("What? No backup mailserver?") but if ou cannot affort multiple primaries it is a good choice.
Mmmmmmmm, must try that myself real soon now to see how it works.
HTH,
M4
--
Courier-mta rocks!
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