[Asterisk-Users] "Defragmenting" mailboxes

[Adam Williams]

>The current pthreads based locks don't work across mutiple
>servers so something needs to be done once you move out of
>the small office environment. The maildir design would work
>for up to a few thousand users
>I like DBMS based designs as they make web based interfaces
>easy to implement and would scale to unlimited size, say to
>someone like Verizon with a few tens of million of users.

Maybe a backed that stores the mail message via LMTP into an actual 
mailbox?  Servers like Cyrus have solved this problem a long time ago.  
Only question would be how to "play back" the message,  but you could just 
store the IMAP message id (always unique).