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Bob,

I don't think the POP servers are used at all for mail relay. They're just used for receiving and storing mail "destined" for your domain. Which begs the question, why run the POP service at all? Are you providing full-service email to your IBM i users? Or are you only using the IBM i SMTP server to send outgoing email? If so, then don't start the POP servers.

Mail relay restrictions are a SMTP configuration option, and for the past 6 years or more, email has been restricted by default for IBM i.

If you do chose to activate POP, then be prepared for spammers, they will try over and over again to send email to your server with random, often nonsensical account names.

-Nathan



________________________________
From: Bob Cagle <bcagle@xxxxxxxxxxx>
To: midrange-l@xxxxxxxxxxxx
Sent: Monday, April 1, 2013 12:30 PM
Subject: Is my 520 being hacked?

Sensational subject line, I know.  We run a small 520 with less than 10
users.  I just had an instance where users complained the system was
slow.  I checked WRKACTJOB and CPU was at 98%, very, very unusual for
us.  I narrowed it down to a bunch of QTPOP* jobs.  I was able to
correct the issue by stopping and restarting the POP TCP/IP server.



I have never seen this before.  Any know what might have caused these
jobs to get out of hand?  My first concern was that someone discovered
how to use me as an open-relay...



We are on 7.1 with all PTFs current as of December 2012.



Thanks



Bob Cagle

IT Manager

Lynk, Inc.




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