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From: jeffe@sandino.austin.ibm.com (Peter Jeffe 512.823.4091)
Newsgroups: comp.mail.sendmail,comp.mail.misc
Subject: Re: How can I restrict/refuse an incoming SMTP connection?
Message-ID: <3343@awdprime.UUCP>
Date: 31 Aug 90 22:32:39 GMT
References: <4005@rex.cs.tulane.edu>
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In article <4005@rex.cs.tulane.edu> mb@rex.cs.tulane.edu (Mark Benard) writes:
>I have a problem with one particular host that is making SMTP connections
>with us and then just hanging on, eating up lots of CPU time and eventually
>making multiple connections which block our local sendmail from running the
>queue.  Is there anything I can set in sendmail.cf or elsewhere to cause
>connections from this host to be refused or to limit the time length of an
>incoming SMTP session?

I can't think of any way to restrict connections from that host (without
hacking the code), but you can certainly use the r option to set the read
timeout.  E.g., doing "Or5m" will timeout the server's read after 5 minutes
and cause it to die.  Look for the timeout syslogs to tell you when it
happens (and with whom).

-------------------------------------------------------------------------------
Peter Jeffe   ...uunet!cs.utexas.edu!ibmaus!auschs!sandino.austin.ibm.com!jeffe
        first they want a disclaimer, then they make you pee in a jar,
                   then they come for you in the night