Exchange 5.5 Internet Mail Not sending to a certain domain!

[RWoods]

This is a similar one to others listed here...
When I try to send a message to a specific internet address, I get " Unable to deliver the message due to a communications failure". NSLOOKUP resolves the domain, TELNET on port 25 works, external email (from home) to the domain works. Email to other external domains work. My domain is not blocked by that domain.
I have processed an email using outlook express, using the exchange server as the SMTP server -haven't received the results yet, but I didn't receive any errors this time.
I suspect something in Exchange is preventing the process of email to this domain. @tampabay.rr.com, @rr.com, @austin.rr.com,... are the domains that fail.
ANY IDEAS WOULD BE HELPFUL!!!!
Thanks in advance...RW

[RWoods]

It seems that I get answers in other locations before I get any replies here. Here is what I found... After setting up the Administrator mail box to an active mail box, checked all notifications to go to that mailbox. I found that I was indeed on a Blocked list. This was due to relay was enabled. This has been resolved, and soon I should be removed from the list.


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RWoods at 10/17/01 12:01:22 PM

This is a similar one to others listed here...
When I try to send a message to a specific internet address, I get " Unable to deliver the message due to a communications failure". NSLOOKUP resolves the domain, TELNET on port 25 works, external email (from home) to the domain works. Email to other external domains work. My domain is not blocked by that domain.
I have processed an email using outlook express, using the exchange server as the SMTP server -haven't received the results yet, but I didn't receive any errors this time.
I suspect something in Exchange is preventing the process of email to this domain. @tampabay.rr.com, @rr.com, @austin.rr.com,... are the domains that fail.
ANY IDEAS WOULD BE HELPFUL!!!!
Thanks in advance...RW