IMAP/POP3 forwarding to specific pools

Hi, I am new to irule and I am looking for some feedback or help with regards to an issue. I have two domains, going through an f5 vip, to the same email server pool to look for email. So both user@abc.com and user@def.com is currently loging into email server pool 1. I am planning to have a separate email server pool for each domain. So @abc.com goes to server pool 1 and @def.com goes to server pool 2. Is there a way f5 can log the user login domain and route the traffic to the respective pool?

Any help appreciated. Thanks