(Looking to avoid 200 PTR records on that one IP..
don't ever do that, because the 512-byte DNS packet returned by the
ansewring DNS will be truncated, with truncated, "tc", bit set.
Use only 1 PTR per IP for MTA IPs.
If possible, and with IMail it's apparently not always possible:
1. official host domain name owns the A record for the IP a.b.c.d
imail-ohn.domain.tld. A a.b.c.d
2. reverse domain for the IP owns the IMail official host name:
d.c.b.a.in-addr.arpa. PTR imail-ohn.domain.tld.
If you don't succeed in matching PTR + A records, many, most?, MTAs will
reject your IP as having no PTR record.
The above DNS records have NOTHING to do with MX records nor HELO hostnames.
Len
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