550 administrative prohibition error

[Godfrey]

Outlook returns the error :
Your message did not reach some or all of the intended
recipients.
The following recipients could not be reached:
"recipients name" on "time"
550 administrative prohibition,
could somebody please tell me what causes this error.

 

[neo [mvp outlook]]

This might mean that the receiving server will not accept the message
because the connecting host or the originating host sending the message is
on a realtime blackhole list.

 

[Godfrey]

Any clue on how to resolve this ? I'm still learning how to
administer exchange 2000. Please help..

 

[Jeff Stephenson [MSFT]]

You might try setting Outlook up to authenticate to the outgoing server
(done on the "Outgoing Server" tab).

 

[neo [mvp outlook]]

Well, I have good news and bad news for you...

Good The server with IP address 209.212.100.99 is not on any realtime
blackhole lists.

Bad new: Your mail server with an ip address of 209.212.100.99 doesn't pass
a reverse resolve test.

You may wish to open a web mail account with yahoo or hotmail and send an
inquiry to the site (their postmaster) that is rejecting the message with a
550 and ask if your server must reverse resolve. If the answer is yes, add
a pointer record to your public dns space and wait a bit for the world to
catch up with the change (could be anywhere from 15 minutes to 7 days
depending on how folks cache dns entries)