[Dovecot] Denying authentication

[Romer Ventura]

Hello,

 

                I've been running dovecot for over 3 years now and it works
with no problems. I have it setup so that it authenticates users against
Active Directory via LDAP and so far no problems.

 

                What I would like to know is if there is any way that I
could deny access for users trying to access email via cellphones or email
clients outside the company. I can close everything since there are a few
users that need to get emails from outside the company via cell phone of
email clients.

 

                I was thinking if there was a way to lets say create a group
in AD named: "remote-email" that will allow connection and authentication
from any network, any user not in that group will only be able to
authenticate if the source is 192.168.xx.xx/24.

 

Is this possible?

 

Maybe not with Dovecot, but maybe someone else has any ideas..?

 

Thanks

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Romer Ventura