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A comment on How to set up a mail server on a GNU / Linux system. Parent comment

Re:How to set up a mail server on a GNU / Linux system by nacs on Sunday November 17, 2013 @04:13PM (#6750899)
Mail servers are made to attempt redelivery if a mail is undeliverable. Most mail servers will attempt redelivery for multiple days before disposing of it so it shouldn't be an issue.
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Re:How to set up a mail server on a GNU / Linux system by dingaling on Sunday November 17, 2013 @05:03PM (#6751171)
Furthermore, to address the 'server on fire' issue. If you build the mail server and its ancillaries up in a VM ( or number of VMs ) then you can sync VM to another host on a schedule, or even live.

Set-up a heartbeat ping and the alternative host can bring-up its copy of the mail server VM in a few seconds.

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