If I remember right, you should never make an MX record direct to a CNAME, for reasons that I can't remember right now.
All the same, you are right, I could just make my MX be the PTR and most MTAs would be happy.
Unfortunately, the record does not exist, so no help there.
Chris Wagner wrote:
But does a PTR record exist? The double reverse lookup should succeed so long as there is a valid A <-> PTR pair. Regardless of whether it was launched into from another A or CNAME or IP. Unless I'm way off base here, it goes presented name -> IP lookup -> PTR lookup -> IP lookup. If the two IP lookups match, the test is passed.
At 07:35 PM 7/08/03 -0400, Jesse Molina wrote:
I have similar problems with mail servers that do reverse DNS SMTP session checking. Short of paying for a T1 at $800 USD a month, there is no way that I can get an IP allocation with reverse DNS delegation so that I can make my mail server's MX record match up with the PTR record.
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