Mozilla multiple e-mail setup problem

[Arnb]

Using Avast 4.160, Mozilla 1.5Beta with multiple e-mail addresses and  bumped into a minor conflict.

I have two e-mail addresses say: xxxx@yyyy.net and xxxx@wxyz.net

Problem is when I attempt to set server name for both of these addresses to 127.0.0.1 in Mozilla, it presents a duplicate e-mail address message(both are now xxxx@127.0.0.1) and refuses to make the change preventing me from scanning my incoming e-mail from one of the addresses.

Any chance Avast can listen on additional addresses besides 127.0.0.1 or is there some other way around this without changing one email address
 

[Arnb]

After looking at some of the other posts about multiple e-mail accounts I have incoming mail scan working in Mozilla.(For the record I've not setup or tried outgoing scans)  

In Mozilla's Mail and Newsgroup Account Settings-->
Server setting for each email account

Server: pop.example.com  ->  127.0.0.1
Username: yourname  ->  yourname#pop.example.com