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[afnog]strange POP3 logs in maillog- Help



Hello Afnog,
I have began observing strange logouts for POP3 on my mail server. I cant see the 
login log. Here is what the log looks like.

Oct  9 09:45:00 myserver ipop3d[31147]: Logout user=??? host=leased.line.server 
[ww.xx.yy.zz]
Oct  9 09:45:59 myserver ipop3d[31226]: Logout user=??? host=leased.line.server 
[ww.xx.yy.zz]
Oct  9 09:47:02 myserver ipop3d[31300]: Logout user=??? host=leased.line.server 
[ww.xx.yy.zz]
Oct  9 09:48:00 myserver ipop3d[31361]: Logout user=??? host=leased.line.server 
[ww.xx.yy.zz]
Oct  9 09:49:00 myserver ipop3d[31429]: Logout user=??? host=leased.line.server 
[ww.xx.yy.zz]
Oct  9 09:50:00 myserver ipop3d[31520]: Logout user=??? host=leased.line.server 
[ww.xx.yy.zz]
Oct  9 09:51:00 myserver ipop3d[31647]: Logout user=??? host=leased.line.server 
[ww.xx.yy.zz]
Oct  9 09:52:01 myserver ipop3d[31803]: Logout user=??? host=leased.line.server 
[ww.xx.yy.zz]
Oct  9 09:53:01 myserver ipop3d[31889]: Logout user=??? host=leased.line.server 
[ww.xx.yy.zz]
Oct  9 09:54:04 myserver ipop3d[31988]: Logout user=??? host=leased.line.server 
[ww.xx.yy.zz]
Oct  9 09:55:03 myserver ipop3d[32085]: Logout user=??? host=leased.line.server 
[ww.xx.yy.zz]

myserver, leased.line.server and ww.xx.yy.zz are not real. My question is who is ??? 
and when did they login. my server runs Redhat Linux 9.0.

Please help

Regards

David
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