On Monday 31 October 2011 05:38:16 Robert Schetterer wrote:
> Am 31.10.2011 11:35, schrieb Amira Othman:
> > I was checking postfix maillog and I found something strange in
> > it
> > 
> > from=<>, size=4794, nrcpt=1 (queue active)
> > 
> > Oct 31 12:22:36 mailserver postfix/smtp[24079]: connect to
> > smtp.icom.com[64.224.110.142]: Connection timed out (port 25)
> > 
> > Oct 31 12:22:36 mailserver postfix/smtp[24079]: ED0466E68594:
> > to=<r...@lmrs.net>, relay=none, delay=47406,
> > delays=47385/0.02/21/0, dsn=4.4.1, status=deferred (connect to
> > smtp.icom.com[64.224.110.142]: Connection timed out)
> > 
> > 
> > 
> > Is this normal to appear in my log file or it must be denied as
> > it is from <> (what does this mean??)
> 
> <> is the mailer daemon address no need to worry
> guess it wants to send some bounce etc

On the contrary, this is almost always a sign of trouble. Why was a 
bounce sent?

Common causes: backscatter, spammer exploit, open relay ...
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