On 14 Aug 2004, at 10:06, Christine Quiriy wrote:

>
>> On Sat, 14 Aug 2004 00:21:48 -0400, Christine Quiriy
><[log in to unmask]>
>> wrote:
>>
>> >Err First Last  Address
>> >--- ----- ----- -------
>> >  1 08/12 08/12 Zazu Friberg <[log in to unmask]>
>> >                Last error: Mailer mail.podzerone.com said: "553
>> >sorry, that
>> >                            domain isn't in my list of allowed
>> >rcpthosts
>> >                            (#5.7.1)"
>> >
>> >Can anyone explain in layman's terms what is happening here?
>>
>> The domain pitts.com is dead, no longer exists.  Delete the user.

Probably an anti-spam block.  From RFC1893:

       X.7.1   Delivery not authorized, message refused

          The sender is not authorized to send to the destination.
          This can be the result of per-host or per-recipient
          filtering.  This memo does not discuss the merits of any
          such filtering, but provides a mechanism to report such.
          This is useful only as a permanent error.