Fixing ORDB Blacklist (ordb.org) Bounce Back Problems – Exchange

If you are encountering problems with mail referencing
ORDB.org on your Microsoft Exchange 2003 or 2007 server, or mail being blocked with a return message stating that the
sender’s IP was on relays.ordb.org, please ensure that you do not have
relays.ordb.org entry configured in the IMF settings. You MUST restart the SMTP Virtual Server to release this setting.

microsoft exchange ordb removal 

The ORDB was an open relay data base which listed open relays which has recently closed its doors. Most RBLS (real time blacklists) when they wish to dissolve will commonly blacklist the entire internet in order to get the attention of those people using them to stop attempting to contact their IPs.

For more information please see the ORDB Problems page on our support site.
 

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