Delivery According to ACLs' "post" Privilege

[ms419 at freezone.co.uk]

In one area I have had trouble using Cyrus IMAPd: Delivery.

After considerable effort - and help from others - I believe I've 
arrived at the fundamental problem: I wish for users to be able to 
filter mail using arbitrary user level programs, but I don't wish for 
users to be able to deliver mail to any and every mailbox.

For users to be able to filter mail using arbitrary user level programs 
- run with the users' privileges - delivery must be possible with the 
users' privileges. As I understand it, however, allowing a user to 
deliver - either using filesystem permissions or as an LMTP admin - 
means allowing a user to deliver to any mailbox.

I also understand, however, that it is possible to authenticate to the 
Cyrus LMTPd through TCP/IP using SASL, but that "... Only LMTP admins 
can deliver to LMTPd through TCP/IP sockets." Can someone explain why 
it is not possible for users, once authenticated, to deliver to only 
those mailboxes whose ACLs grant them "post" privileges?

Thanks!

Jack

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