SV: Sendmail issues with MAIL/EXPN/VRFY/ETRN

[Anders Andersson, IT]

> -----Ursprungligt meddelande-----
> Från: Mike Kercher [mailto:mike at CAMAROSS.NET] 
> Skickat: den 19 augusti 2004 19:16
> Till: MAILSCANNER at JISCMAIL.AC.UK
> Ämne: Re: Sendmail issues with MAIL/EXPN/VRFY/ETRN
> 
> MailScanner mailing list <> scribbled on Thursday, August 19, 
> 2004 10:26 AM:
> 
> > HI
> > Sorry to bother you but after 2 hoours on the net and 
> complaint from 
> > usersyou are my last resort before a downgrade of sendmail Running 
> > Fedora C2 with sendmail sendmail-8.12.11-4.6
> >
> > Im getting loads of this in my log and cant figure out why:
> > Aug 19 17:16:47 ns2 sendmail[30108]: i7JEGk4c030108:
> > host-207-254-243-131.classicnet.net [207.254.243.131] did not issue 
> > MAIL/EXPN/VRFY/ETRN during connection to MTA
> >
> > If it only was spam senders I wouldnt mind but even 
> companies that I 
> > would excpect to have a correct MTA get it. We still managed to 
> > recieve about 7000 mail today so Im very confused who to 
> blame. I cant 
> > figure out if its me or fedora c2 thats screwed or if its 
> some of the 
> > companies that dont follow some RFC....
> >
> > I cant find anything to help me on the web so if anyone got 
> a clue pls 
> > help or I just have to downgrade my sendmail
> >
> > /Anders
> > (http://www.jiscmail.ac.uk/lists/mailscanner.html).
> 
> This can happen if a host connects to port 25, but does not 
> issue any commands.  This may just be a probe to see if port 
> 25 is open.  They could be looking for a sendmail server < 
> 8.12.9 or issuing a HELO/EHLO and then disconnecting.  If 
> your legit email is coming through without issue, I wouldn't 
> worry about it.

Well, thats just the problem, some legit mail wont get threw because of this
and some do. Ive found some references towards saslauthd on a page and
turned that one on. 
I also found ppl talking about this behavior when they tried to run TLS.
Since Ive never had TLS running before so I really dont know if that could
be the isue

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