> 550 5.7.1 Connections not accepted from servers without a valid sender
> domain.flph840 Fix reverse DNS for 66.171.0.45

$ host 66.171.0.45
45.0.171.66.in-addr.arpa domain name pointer outbound.eastex.net.
45.0.171.66.in-addr.arpa domain name pointer eastex.net.

It should have exactly one.

https://datatracker.ietf.org/doc/html/rfc1912#2.1

I wouldn't reject messages based on that, but there you have it.

-- 
Atro Tossavainen, Chairman of the Board
Infinite Mho Oy, Helsinki, Finland
tel. +358-44-5000 600, http://www.infinitemho.fi/
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