[Dovecot] LDAP Filter

Dear All, All my users reside in ldap and i am using filter to restrict access to imap and pop service which is working good but as my webmail also uses the imap service, restricting imap will also cause my users to login to webmail. I am looking for a way to bypass the same for a particular ip or loop back ip.

Hoping to get answer ...

Thanks Regards

Piyush Joshi