[imp] Full Sent folders

[Rick Romero]

  Quoting Art Stephens <astephens at ptera.com>:

> Would be nice if we could treat Sent folders the same way as Trash
> folders.
>
> Customer Sent folders are taking their accounts over quota.

Not an IMP issue, but if you're using Dovecot on the backend you could
include Sent in quota ignore:
http://wiki2.dovecot.org/Quota/Configuration

There should also be a quota warning email autogenerated (for users to
ignore - but then they can't say they didn't know).

Rick