>rejection may be related to content with spam-like characteristics

do you run anti-spam and anti-virus on your outbound mail?

>  or
>IP/domain reputation problems.

>How can I get even a glimmer of evidence to help me track down the
>spammer. And any ideas how to get my ip address removed.

do you run SAV? if so, they may be deciding that your SAV is sending 
to many bad recips.

Look in past maillogs to see if SAV has been rejected mail from those domains.


Len


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