Just guessing, but the PTR should match an A record. The PTR for the MX is dantor.com. That is a domain, not an a record. Even if you had a wildcard A record like *.dantor.com, I do not think that counts as appropriate.
that's a decent guess, but it's not the case:
# dig -x 67.29.153.2
;; ANSWER SECTION: 2.153.29.67.in-addr.arpa. 3600 IN PTR dantor.com.
# dig dantor.com a
;; ANSWER SECTION: dantor.com. 1058 IN A 67.29.153.2
For domains known to have matching A+PTR records (all the big ISPs, and a list of "frequently forged sender domains", IMGate can reject A + PTR don't match.
Len
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