[cobalt-users] Raq550 Sendmail

[Brian Rahill <cobalt@xxxxxxxxxxxxxxxxxxxxxxx>]

Hi all,

Every once in awhile I'll get a "connection closed by foreign host" error 
when trying to send mail through my Raq550.
A restart of sendmail takes care of it immediately and often it takes care 
of itself within a few minutes.

After getting this error today, I did a ps auxfw and saw this:

23585 ?        S      0:00 sendmail: accepting connections
23587 ?        S      0:00  \_ sendmail: q1/h2DMFOx26020 
return.gamblersnewsnetwork.net.: user open
23588 ?        S      0:00  \_ sendmail: q2/h2DMFDx25987 
return.silverplatterspecials.net.: user open
23589 ?        S      0:00  \_ sendmail: q3/h2DMFQx26034 
return.rexrecommends.net.: user open
23590 ?        S      0:00  \_ sendmail: q4/h2DMFRx26037 
return.silverplatterspecials.net.: user open

No my guess is that this is just spam in the sendmail queue being returned 
to the spammers but I wanted to be sure.
The "user open" part I don't like very much although I've checked and I'm 
not an open relay.

Can someone help decipher these logs and give me some pointers on why 
sendmail might be flaking out on me occasionally.
The server is lightly loaded at all times.

Thanks.

Brian