[Dovecot] Per-user IMAP enable - is it possible?

[Gedalya]

On 3/20/2012 1:28 AM, Alexander Chekalin wrote:
> Just wonder if it is possible to enable/disable IMAP4 on Dovecot 
> (2.0.x as far) on per-user basis?
>
> The deal is simple: our policy is not to store a lot of mailing on 
> mailserver (the user should store it locally), thus the 'use POP3' 
> approach, but for a vary few users it is permitted to use IMAP4. But 
> users sometimes simple miss the point that some mail clients (e.g. TB) 
> 'prefer' to use IMAP4 first, and afterward I see mailbox full of 
> mailings and no local store of it on user's workstation.
>
> Sound too complicated, but setting up two Dovecots is not something 
> I'd love to do as well.
>
> Thank you for any ideas,
>   Alexander
There would be various ways to do this, the specifics would depend on 
what kind of passdb you use.

If you happen to be using a SQL database, you could do something like 
this: Add an allow_imap column, and change the password_query in 
dovecot-sql.conf.ext to something like this:

password_query = SELECT password FROM user WHERE username = '%n' AND 
domain = '%d' \
   AND ('%s' != 'imap' or allow_imap=1)

This would make the user appear to not exist when trying to log in via IMAP.

http://wiki2.dovecot.org/Variables