[Dovecot] Migration questions...

[pod]

Richard Hobbs <richard.hobbs at crl.toshiba.co.uk> writes:

>   19. Once everything is working perfectly, send an email to the entire
> company instructing them what to do after the outage and arrange an
> outage and do the following steps as soon as the outage begins:
>
>     a. Unplug DMZ switch from firewall to make delivered mail wait at
> the sender.
[...]
>     i. Plug DMZ switch back into firewall and begin monitoring exim logs
> to check that mail is being delivered.

If I'm not misunderstanding the steps between 19.a -- 19.i are going to be
done while not network connected?  I'd be slightly concerned that these
steps may involve anything some that needs to do DNS lookups or the like
at which point they may hit long(ish) timeouts or just fail completely.