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I'm successfully using a Barracuda spam filter in conjunction with our 2010 Exchange server.  Our MX record and our rDNS record point to, which is also the Hello response from our Exchange server.  Now that the Barracuda is in line and working, it is responding with a Hello of  I've added an A record for the Barracuda response, and MX Toolbox passes everything, but I'm concerned that eventually they will get black listed because the MX record and rDNS don't match the Hello banner.

I'm considering changed the MX record, and the matching rDNS record, to  But this has been up and running for a while and I don't want to create an issue where one doesn't exist.

Thoughts please??  Thanks!!
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Dr. KlahnPrincipal Software EngineerCommented:
... eventually they will get black listed because the MX record and rDNS don't match the Hello banner ...

Very possible.  Good spam filtering software checks to see if the HELO/EHLO FQDN matches both the MX record and the RDNS lookup.  If it doesn't, then one of two things will occur:

  • Immediate rejection.  Less likely than below, but strict sites do ahere to this policy.
  • The spam probability for the message will be increased several notches, making it more likely that any other issue will cause the email to be rejected.

MX, HELO/EHLO and RDNS should all match to produce the maximum probability of mail going through.

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Jeff GloverSr. Systems AdministratorCommented:
We've been using a Barracuda for years with no issues like that. Although we did set the default domain under Basic>IP configuration to match our main domain. THe host name is not as important as the domain matching.
Seth SimmonsSr. Systems AdministratorCommented:
No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I have recommended this question be closed as follows:

-- Dr. Klahn (https:#a42386606)
-- Jeff Glover (https:#a42387777)

If you feel this question should be closed differently, post an objection and the moderators will review all objections and close it as they feel fit. If no one objects, this question will be closed automatically the way described above.

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