Ethereal-users: [Ethereal-users] display filter for pop3?

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From: Agryppa <agrypa1@xxxxxxxxxxxxxx>
Date: Mon, 6 Mar 2006 10:46:39 +0100
Hi,
I only want to see those pop3 transmissions that have some payload in it and 
see the USER field, too. So I did this in display filter:

pop contains USER and pop contains RETR

It doesn't work, though. The two statements work separately bu not togather.
How to make it work?

thanks for any hints
-- 
Agryppa