Patches used at FastMail.FM

[Rob Mueller]

> but this is in conflict with the the idea that in a large installation of 
> people who don't know each other the 'anyone' permission doesn't make 
> sense.
>
> what is really desired for + addressing is to say that messages that 
> arrive via the lmtp interface are allowed to write to all folders (not 
> just the inbox folders) without allowing other users on the system to 
> write arbatrary data to other people's folders via the IMAP interface.
>
> at least if it's arriving via the lmtp interface you have reason to 
> believe that it's been (somewhat) validated by your MTA.

That's really what the "p" permission is all about:

   p - post (send mail to submission address for mailbox,
       not enforced by IMAP4 itself)

So setting "anyone p" means that email via LMTP can be put into any persons 
folder by the delivery agent, but that folder isn't visible or accessible 
via any IMAP commands.

At least that how I believe it works, and what we've observed. Maybe Ken can 
clarify?

Rob