What kind of bandwith usage do you see? I'm not sure I'd be brave enough to try this anyway, but one thing I worry about is exceeding bandwith quotas and ending up with a large bill.
Also, do you just have one server or a backup as well?
Also, do you just have one server or a backup as well?
Using postfix + dovecot(imap) + thunderbird. 1 user, set to check mail every 9 minutes. Not even sure if I have IDLE on my server (unless it's on by default).
The SolusVM control panel shows 15-30 bytes/second (in+out) when it's idling. Now add how much your email weights and you got your bandwidth.