Postfix and reject_unknown_client parameter question

[gw1500se]

I am using reject_unknown_client in my smtpd_helo_restrictions. I have one legitimate email server that is being rejected as unknown. However, a dig -x yields a correct hostname. The only difference I can see between this mail server and other servers is that the address resolves to 2 hostnames instead of one. Is this the reason postfix says it is an unknown hostname? If so why? If not where might I look to see why postfix thinks it is unknown even though it does resolve? TIA.

[miasme]

multiple host names in DNS shouldn’t confuse postfix.

have you verified that postfix is using the correct hostname?
go to the server that is being refused, and run a:
postconf -n

look for the “myhostname” line.
does it match what you want it to be?

could you use a “mynetworks” entry as a work around or alternate acceptance method for your servers?

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