Not receiving emails from some domains

5 pts.
Tags:
Email
Telnet
I have a customer in Austria, they have recently changed their MX records to a new IP address. I can send them emails which they receive no problem, when they send me an email, I don't receive it. They send over 20,000 emails a week to other countries all over the world, including our own, and we seem to be the only ones having a problem, I have run message tracking in Exchange, but it does not find any emails from this domain. I can telnet onto their mail server and send an email to our Exchange server and we receive it. Please help?

Answer Wiki

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Do you have a whitelisting service, SPF (sender policy framework) or some other sending domain validation? SPF is supposed to validate a sending server as authoritative for the “FROM” domain. The SPF record will need to be setup for the sender’s domain.

An example SPF record would look like:

example.com in TXT “v=spf1 a:mailserver mx:example.com ip4:5.4.3.2 include:hostdomain.com ~all”

Where
a:mailserver is the A record name for the authorized server sending mail on behalf of example.com
mx:example.com says that all of the MX records are authorized servers sending on behalf of example.com
include:hostdomain.com means that the ISP for hostdomain.com can also send on example.com’s behalf – BUT hostdomain.com must also have SPF records
~all means that the list above are all of the authorized sending servers for example.com

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