How can I have 2 or more pop3 email addresses in gnus please?

I've tried this, but it didn't work, 

--8<---------------cut here---------------start------------->8---
(setq mail-sources '((file :path "/var/spool/mail/boudiccas")
(pop :server "mail.plus.net" :user "foobar" :password "foofoobar")
(pop :server "mail.plus.net" :user "foobar2" :password "foobarfoo")))
--8<---------------cut here---------------end--------------->8---

It also seemed to pose problems with possibly some emails not actually
moving away from my computer. But I'm not too sure of that.

Thanks
Sharon.
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