> Does  the  "X-RCPT-TO:  <>" indicate a message with a BCC? or to the
> postmaster?

The latter.

>  Is  there anyway to tell who these messages were sent to if it is a
> BCC?

The  RCPTs  of  every  message are in your logs, and a recipient whose
name  does  not  appear  in  the headers will have X-RCPT-TO: added to
their individual copy of the e-mail.

> those  that  do  include  the  "X-RCPT-TO:  <>" are delivered to our
> postmaster account.

The  NULL  address is a synonym for the postmaster account, so this is
appropriate.

> I'd like to quit receiving these messages, but need to know what to ask the
> client to change.

Tell them to stop spamming your postmaster.

-Sandy


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