>How can I determine what the real domain or IP is a recieved email address?
>I have recieved spam that I want to block but no domain is listed.

look in your logs:

12:12 00:00 SMTPD(3F7B0174) [212.73.210.73] connect 212.73.210.75 port 2603
12:12 00:00 SMTPD(3F7B0174) [212.73.210.75] HELO mgw1.MEIway.com
12:12 00:00 SMTPD(3F7B0174) [212.73.210.75] MAIL 
FROM:<[EMAIL PROTECTED]>
12:12 00:00 SMTPD(3F7B0174) [212.73.210.75] RCPT TO:<[EMAIL PROTECTED]>

The "connect" ip is the sending machine, your best item to 
block.  Assume ehlo/helo hostname, "mail from: sender@senderdomain" 
to be bogus.

Len



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