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ZMailer relaying problem


I was surprised to find out our mail servers are listed as open relay
by ordb.org and orbz.org.

Upon close examining the smtpserver log, I came across the following:

== Begin ===

17595LASKr	MAIL FROM:<spamtest@jupiter.scs.ryerson.ca>
17595LASKw	250 2.1.0 Sender syntax Ok
17595LASKr	RCPT TO:<"marvin@ordb.org"@[]>
17595LASKw	250 2.1.5 Recipient address syntax Ok
17595LASKw	354 Start mail input; end with <CRLF>.<CRLF>
17595LASKw	250 2.6.0 S27257AbRJPSPg message accepted
17595LASK#	S27257AbRJPSPg: 1113 bytes
17595LASKw	221 2.0.0 jupiter.scs.ryerson.ca Out

== End ===

How can I stop 
RCPT TO:<"marvin@ordb.org"@[]>
from passing through our mail server?

One mail server is running zmailer 2.99.52 on Enterprise 450 with
Solaris 7, and the other zmiler 2.99.55 on sparc 1000 with Solaris 7.


Grace He			
Ryerson University - School of Computer Science	
Voice : (416) 979-5000, ext. 6697
Fax   : (416) 979-5064
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