My mail could not be delivered HELP

[Olivier Nicole]

> My mail server has 2 static IPs. Just I use Dual view Domain RRs. Can that
> be the cause? 

Then there is an issue there, because the rDNS problem is on
91.103.27.98 (see error message) and the IP fro your machine are .90
and .97

Anyway, your machine has no rDNS.

Olivier