nginx as pop3/imap proxy

[Andrea]

Hello,
I'm using with satisfaction nginx as pop3 and imap proxy of 4/5 mailservers.

I have just one problem:
when one server is down, nginx can't authenticate the user and the user
mail client request the password as if it's wrong.
Without nginx, if one server is down, the user just can't connect to it,
but there's not an authentication problem.

So, my question is:
is it possible to configure nginx to manage in some different way this kind
of situation? Best, but maybe not implementable, would be nginx to simulate
a fake connection even if the server is down, so when it comes up again the
user just see a delay with the received mails.

Thanks
Andrea
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