I feel it's worth to impart:

Our uncomplicated mail server which keeps on Coda all of its mail-related
binaries, the configuration and also the mailboxes was cut off its Coda
servers for about 4 hours.

During this time the users could not see any updates on the mailboxes
but otherwise no influence was noticed. The logs show the incoming mail
being accepted and delivered (becoming visible for the users when the
connection was reestablished).

This is of course not any kind of a scientific experiment, it was
forced upon us by the random forces of the nature, but the outcome was
as expected and quite pleasant.

Thanks Satya and all Coda developers for implementing the right kind
of concept!

Rune