search for: ucem

...;> doesn't behave as mail server (thus never comes for re-delivery, >> and definitely doesn't try backup MX which real servers always >> do even before attempt of re-delivery). > > I'm not convinced. Spam is big business and trying a 2nd MX is cheap. > Much spam/ucem is deliberately sent directly to the lower priority MX host from the outset on the assumptions that: 1.) the secondaries will be less well configured to detect SPAM to begin with; and 2.) once mail is routed though an officially recognized secondary host then the primary is less likely to treat suc...

...ng in DNS to aaaaa.com? When I set up secondary MX services in Sendmail (and Postfix) then I always use the direct address feature of the domain routing table and avoid looking up MX RRs altogether. After all, if the mail arrived here it is a good bet that the main MX is off-line (or this is SPAM/UCEM but that is another issue). So assuming that the primary MX host is mx10.example.com and the secondary is mx40.something.else then with Sendmail the file /etc/mail/mailertable on mx40.something.else should contain something like this: example.com. esmtp:[mx10.example.com] .example.com. esmtp:[mx1...