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If you want to email someone whos email is down and they have no backup mail server then, no. Other than setting it to send later you're fucked.
We run a backup mail server on our system but it's just to insure that mail is still received. If the primary webmail client goes down our users cannot actually see that email until it comes back up (unless they are able to handle configuring a desktop client or another webmail service to connect via POP / IMAP and check their mail).
We ran into this very issue recently after a failed update. Our mail was still working, our users just couldn't see it. I'm working on a backup webmail solution now as a result.
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-= Software / Systems Architect and Server Geek =-
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