Mailinglist Archive: opensuse-security (195 mails)

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sendmail -- sender domain must resolve
  • From: Chrissy LeMaire <chrissy@xxxxxxxxxxxx>
  • Date: Tue, 21 Mar 2000 10:06:47 -0800
  • Message-id: <>
Hey All,
I'm running sendmail 8.9.3 and pretty much left everything default. The spam stoppers are in full effect..

I have a question about the following:

Mar 20 14:39:25 xxx sendmail[18726]: OAA18726: ruleset=check_mail, arg1=<xxx@xxxxxxxx>, relay=[], reject=451 <xxx@xxxxxxxx>... Sender domain must resolve

So i do a bit of digging:

# nslookup


*** can't find Non-existent host/domain

> set type=mx
Address: ipaddyhere

Non-authoritative answer: preference = 0, mail exchanger =

Authoritative answers can be found from: nameserver = AUTH02.NS.UU.NET nameserver = nameserver = internet address =
AUTH02.NS.UU.NET internet address = internet address = internet address =

By looking at this.. I concluded that MX records aren't looked at when deciding if a domain resolves or not. So.. I do the some testing with (which doesnt resolve but has an MX record) and it worked..

So. Am I right when I assume that's ns servers were most likely down for a period of time? is huge.. and 3 nameservers all go down at the same time? This doesnt seem right.

Any suggestions?

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