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>> $ host 18.104.22.168
>> 22.214.171.124.in-addr.arpa domain name pointer Lanyon.com.
> but they don't match:
> host Lanyon.com
> Lanyon.com has address 126.96.36.199
> 188.8.131.52.in-addr.arpa domain name pointer
Ah, right, I see.
> why not just use something like 'ob.lanyon.com', in your HELO, FQDN, and
> make sure that both FWD and RDNS match?
This is mail that I am receiving and trying to whitelist, not mail
that I am sending.