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Groups > comp.os.linux.networking > #2001

Dropping connection attempts to port 25

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	Somebody keeps trying to connect to my sendmail server, without 
success, but filling my logs in the process. Since, according to the 
sendmail logs, the connection seems to be coming from a specific IP 
address <ip>, I added the following IPTables rules:

	iptables -A INPUT -s <ip> -j DROP
	iptables -A OUTPUT -d <ip> -j DROP

However, I can still see further connection attempts in the sendmail logs.

	Any ideas on how to get IPTables to drop such attempts before 
they get to sendmail?

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Dropping connection attempts to port 25 Clark Smith <noaddress@nowhere.net> - 2013-03-11 14:48 +0000
  Re: Dropping connection attempts to port 25 Richard Kettlewell <rjk@greenend.org.uk> - 2013-03-11 14:58 +0000
    Re: Dropping connection attempts to port 25 Clark Smith <noaddress@nowhere.net> - 2013-03-11 15:12 +0000
      Re: Dropping connection attempts to port 25 Richard Kettlewell <rjk@greenend.org.uk> - 2013-03-11 16:24 +0000
      Re: Dropping connection attempts to port 25 Octothorpe <Octothorpe@invalid.com> - 2013-03-11 16:38 -0400
        Re: Dropping connection attempts to port 25 Richard Kettlewell <rjk@greenend.org.uk> - 2013-03-12 10:16 +0000
  Re: Dropping connection attempts to port 25 Dale Dellutri <ddelQQQlutr@panQQQix.com> - 2013-03-11 14:58 +0000
    Re: Dropping connection attempts to port 25 Clark Smith <noaddress@nowhere.net> - 2013-03-11 15:15 +0000
  Re: Dropping connection attempts to port 25 David Hough <noone$$@llondel.org> - 2013-03-12 07:29 +0000
  Re: Dropping connection attempts to port 25 Joe Beanfish <joebeanfish@nospam.duh> - 2013-03-12 13:21 +0000

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