>If I stop my primary mailserver then my secondary correctly stores the mail.
ok
>But I have a DSL customer that runs his own mailserver (not MS Exchange).
>His DNS looks like this (just like all the others):
><snip>
>eurovat.com. IN A 63.209.65.120
>eurovat.com. IN MX 10 dsl-64-32-19-102.dsl.netwood.net.
>eurovat.com. IN MX 20 linus.netwood.net.
></snip>
>
>When I got a DNS error and our DNS servers could not resolve his hostname
>(dsl-64-32-etc...) then the mail bounced back to the senders.
>
>Why didn't it get stored in the backup mailserver?
Whoa, wait a min. If DNS is not resovling his hostname, then it's
not returing ANY MX records so where the hell is the sender supposed
to send the mail?
A lookup failure (no MX records) is always fatal for mail delivery.
A lookup success (got MX records) with an MX machine failure triggers
the attempted delivery to backup MX's.
Len
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