limit user access to certain IP addresses?

[Tomasz Chmielewski]

It it possible to limit POP3/IMAP access for chosen users only to 
certain IP addresses?

For example, I'd like to allow some users only access from 127.0.0.1 
(or, Squirrelmail running on the same address as Cyrus); those users 
shouldn't have public access to POP3/IMAP from the whole Internet.

At the same time, though, I would like to allow access for some other 
users via POP3/IMAP as well.


Is it somehow possible with Cyrus? If it is, it would be great if it 
could be used to limit access to SMTP as well. As SMTP is different than 
what Cyrus does, this would perhaps suggest some additional PAM library?

Any ideas?


-- 
Tomasz Chmielewski
http://wpkg.org