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[cobalt-security] Domain of sender address does not resolve
- Subject: [cobalt-security] Domain of sender address does not resolve
- From: loptson@xxxxxxxxxxxx
- Date: Mon, 28 Jan 2002 21:41:41 -0500
- List-id: Mailing list for users to address network security on Cobalt products. <cobalt-security.list.cobalt.com>
I'm seeing a lot of these types of messages in my logcheck output. We've noticed a slow down in the server as well. I have a couple of questions:
1) are these anything to worry about?
2) will the attempts by the server to resolve the unresolvable slow things down?
3) if the answer to 2 is yes, is there a way to turn off the check and is that advisable?
The background is that I think I tweaked some settings that had to do with making sure that when folks said they were coming from a particular place that they really were. Unfortunately I neglected to take good notes so I don't know what I tweaked (some TCP file where you set the contents to 0 or 1 strikes a bell). The server is very slow and I wanted to see if we could speed things up a bit.
Thanks,
Paul
Jan 28 18:01:12 www sendmail[12952]: g0T017U12952: ruleset=check_mail, arg1=<kujarek@xxxxxxxxxx>, relay=[213.134.143.66], reject=451 4.1.8 <kujarek@xxxxxxxxxx>... Domain of sender address kujarek@xxxxxxxxxx does not resolve
Jan 28 18:01:20 www sendmail[12953]: g0T01FU12953: ruleset=check_mail, arg1=<kujarek@xxxxxxxxxx>, relay=[213.134.143.66], reject=451 4.1.8 <kujarek@xxxxxxxxxx>... Domain of sender address kujarek@xxxxxxxxxx does not resolve