From owner-freebsd-questions  Tue Mar  5 12:34: 4 2002
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Date: Tue, 5 Mar 2002 15:26:24 -0500 (EST)
From: Mike Bertsch <questions@radioactivedata.org>
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To: Raja Velu <raja@micronetusa.com>
Cc: <freebsd-questions@freebsd.org>
Subject: Re: Sendmail - MX record resolution error
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Howdy,

To check if there's an MX record for a domain, try:

  nslookup -q=MX <domainname>

Not all companies use mail.<domain> as their mail server--some use
smtp.<domain> or other random names, so as you surmised, pinging
mail.<domain> won't always work.  Even if the server does exist, the
company may not have an MX record pointing to it.

   HTH,
  -Mike

On Tue, 5 Mar 2002, Raja Velu wrote:

>
> Hi,
>
> What does this error mean?
>
> reject=450 4.7.1 <user1@company1.com>... Can not check MX records for
> recipient host company1.com
>
> Does it mean that the domain "company1.com" does not have a mail server
> associated with it?
>
> If so, how do I check if there exists an MX record for a particular domain.
> I used to ping to mail.<domainname> and see if it resolves. That apparently
> is not the right approach as the emails sent to a user today, generated the
> above error even though I'm able to ping mail.<domainname> for his email
> address.
>
> Thanks for your time.
>
> Rgds,
>
> Raja Velu
> Senior Software Engineer
> MicroNet USA, Inc.
> 847 593 3639 x 112
>
>
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