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why is only this domain failing?

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why is only this domain failing? - 23.Jul.2004 8:11:00 PM

Carl Parker

Posts: 89
Joined: 16.Jul.2003
From: Houston, Tx
Status: offline

I have a user that tries to send mail from @exwlogistics.com to this mail address but it keeps failing

<sales@freightswift.force9.co.uk>:
212.159.11.36 does not like recipient.
Remote host said: 550-Verification failed for <rstclair@exwlogistics.com>
550-It appears that the DNS operator for exwlogistics.com
550-has installed an invalid MX record with an IP address
550-instead of a domain name on the right hand side.
550 Sender verify failed
Giving up on 212.159.11.36.

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RE: why is only this domain failing? - 23.Jul.2004 11:37:00 PM

RonStewart

Posts: 133
Joined: 28.Jun.2004
From: Vancouver, Canada
Status: offline

Sounds like they're doing reverse DNS lookup, which a lot of companies don't because it creates extra traffic and slows things down (plus it doesn't do you any good in Exchange; they must be using another mail system).

Have you checked your DNS server's external MX records for the problem the message indicates?

(in reply to Carl Parker)