I do something similar, maybe it will help. Go to Settings->Accounts and Imports There you can configure other POP3 enabled mail systems and retrieve mail as

I do something similar, maybe it will help. Go to Settings->Accounts and Imports There you can configure other POP3 enabled mail systems and retrieve mail as well as send email as if it were from that system. In that way google (and the gmail repository) becomes your single mail interface. I have five email addresses (the limit for free gmail) configured this way including work email, home email, other domains etc.,