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521 Mail rejected - you are listed in Open Relay D
  Posted by  . .  on Friday, March 28, 2008 at 11:14:50 AM (EST)
HI I migrated my mail server to new hardware and now my client can connect via outlook, but I get this error message

521 Mail rejected - you are listed in Open Relay Database (Open Relays) [FREE] - http://www.ordb.org/

what is this and how do i fix it

When i use outlook to connect directly it works

Please help urgent
  Posted by Robert Smith  on Friday, March 28, 2008 at 2:26:11 PM (EST)
The ORDB DNSBL has been closed for some time now, and it was removed, but now it's been put back into service and is actively rejecting mail. You can read something about this on Slashdot:

http://it.slashdot.org/article.pl?sid=08/03/25/2124224&from=rss

Instructions for removing the ORDB entries can be found in the Knowledge Base: http://support.software602.com/kb/view.aspx?articleID=1020

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