Windows server 2003 SMTP (comcast email only) getting  stuck in que folder

Posted on 2016-11-04
Medium Priority
Last Modified: 2016-11-08
All email but comcast and emqarc are going through. These emails get stuck in the que folder.

Any advise would be greatly appreciated. Let me know what else to post as far as details that will help in troubleshooting.
Question by:Ron Hartpence
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Expert Comment

by:Austin Texas
ID: 41874461
How much mail are we talking about? Could you have triggered their anti-spam policies?

Any messages in the event log?

Author Comment

by:Ron Hartpence
ID: 41874506
We do a listserver to parents and about 1,000 were stuck in our smtp que folder.

We created a test group with about 8 and same thing only comcast were stuck.

Ive contacted Comcast Customer Security Assurance Department and they said our public IP and email our not blocked.. not sure what is going on..

Author Comment

by:Ron Hartpence
ID: 41874552
Event viewer isn't telling me much: Just in DNS I see this: 10/20/2016
'The DNS server has encountered numerous run-time events. To determine the initial cause of these run-time events, examine the DNS server event log entries that precede this event. To prevent the DNS server from filling the event log too quickly, subsequent events with Event IDs higher than 3000 will be suppressed until events are no longer being generated at a high rate.
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Author Comment

by:Ron Hartpence
ID: 41874580
Message delivery to the host '' failed while delivering to the remote domain 'comcast.net' for the following reason: An SMTP protocol error occurred.

Accepted Solution

Austin Texas earned 2000 total points
ID: 41875804
Can you telnet to that IP address on port 25? You may need to install the telnet client.
Something like...
telnet 25
HELO mail.domain.com
MAIL from: <sender@domain.com>
RCPT to: <recipient@comcast.com>
Subject: Test message
This is a test message.

Open in new window

Another solution would be to use an SMTP smart host (I recommend this) where you send your SMTP traffic through your ISPs SMTP server.

Author Comment

by:Ron Hartpence
ID: 41877270
Thank you! I think that lend me to the correct answer. BL00010 error which means :

"Your email could not be delivered because your email provider is listed on the Cloudmark Sender Intelligence (CSI). CSI is a list of IP addresses which have been detected as sending spam. Comcast uses this list to protect its subscribers from receiving spam."

Hopefully that is it and I will get confirmation we have been removed. Then I will close and mark you as best solution.

Thanks again!

Author Closing Comment

by:Ron Hartpence
ID: 41877331
You're the man! Thank you!

Expert Comment

by:Austin Texas
ID: 41879121
Glad I could help!

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