[clug] Single MX, multiple A records
Alex Osborne
aosborne at nla.gov.au
Fri Aug 1 02:07:42 GMT 2008
Michael James wrote:
> What is the standard behaviour
> when a DNS name returns multiple A records?
>
According to this guy, it varies from implementation to implementation.
http://readlist.com/lists/postfix.org/postfix-users/12/62249.html
From what I've seen, DNS servers will usually return multiple A records
in a random order each time they're queried. So likely even if the
client host always just picks the first one, if the first delivery
attempt happens to hit the dud server, the second or third attempt will
hit the working server. So I guess normally (unless you're particularly
unlucky) the mail will just have a chance of being delayed a while.
Alex
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