>If power failure occured or imail server down...
>can imail transfer all the imail system or file to another server...
>i mean something like clustering......
>
>or is there any other way???
The easiest and probably cheapest way is to use the mail reliability
features built into DNS and SMTP protocols: use 1 or more mail servers as
secondary, backup mail servers, so that when the primary is not
"reachable", then mail senders send the mail to the 2nd, 3rd, 4th backup
servers. The backup servers receive the mail in a store-and-forward /
relay role and immediately take over the task for delivering the mail to
the primary mail server.
Very easy to implement in DNS:
@ IN MX 5 1st-mail.domain1.com
@ IN MX 10 2nd-mail.domain2.com
@ IN MX 15 3rd-mail.domain.3.com
The priority numbers 5, 10, 15 determine the order, lowest to highset, used
by sending mail servers when trying to deliver the mail.
Preferably, the backup mail servers are off-site and off-backbone from the
primary mail server.
Len
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