[Dovecot] Per user based protocol access and pause after failed login?

[Mart Pirita]

Hello.


Tried search, no luck, sorry, if this is already answered, but I'm still 
looking a solution using pam_auth how to define in dovecot which user 
can access which protocol, for example, default is:

protocols = pop3 pop3s imap imaps

I'd like to use something like this:

exclude_using_pop = user1, user2, @group
exclude_using_pops = user1, user2, @group
exclude_using_imap = user1, user2, @group
exclude_using_imaps = user1, user2, @group


The idea is security and also preventing imap user by accident logging 
in using pop3 and downloading (clearing inbox for imap) all inbox.

And also some throttling, for example the adjustable time to pause 
access after failed login etc would be great.

-- 
Mart