Christopher Chan wrote:
Fajar Priyanto wrote:
On Friday 04 January 2008 10:30:32 Ugo Bellavance wrote:
AFAIK, redundancy for mail server seldom uses linux-ha/any other
failover
stuffs. It is most common to use 'backup MX' in DNS settings. So, when
the main server in unreachable, the sender mail server would try to the
secondary MX through DNS query.
That's the easy part, but where do you store the e-mail once you have
accepted it? If the pop/IMAP server is down for a while, people won't
be able to retreive their e-mail...
The secondary MX will temporarily store the mails. And when the
primary server is up again, it will get all the mail from the
secondary. Yes. there will be a down time in terms of mail service for
users.
Maybe others can recommend a better best practice for this.
Yes. No backup mx. You ought to have a cluster of mail servers to accept
mails for your domain if you need HA. Otherwise, let incoming emails
queue at their sending hosts as setting up a 'backup' mx that will only
hold the email and then pass them onto the 'primary' is really pointless
and only serves to 1) delay delivery of mail and 2) delay notification
of mail delay to the sending party. It is no longer acceptable today to
wait for a week before notifying the sender of non-delivery. The idea of
a backup mx no longer fits today's communications.
I agree, and I don't want to have any client not being able to contact
the pop/IMAP server for more than 15 minutes.
Ugo
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