Get error message that reads: An unknown error has occurred. Account: 'shawmail', Server: 'shawmail.tb.shawcable.net', Protocol: SMTP, Server Response: '554 Your access to this mail system has been rejected due to the sending MTA's poor reputation. If you believe that this failure is in error, please contact the intended recipient via alternate means.', Port: 25, Secure(SSL): No, Server Error: 554, Error Number: 0x800CCC6F Have asked IP for help. No response.

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Sounds like you have your outbound SMTP settings incorrect.  

I've never seen an ISP have their customers connect to the mail server on port 25. 
 Port 25 is used for public e-mail across the internet.  Usually the e-mail clients 
their customers use will connect to a different port.

You better read the help information to get the proper settings for that provider.

This is on every outbound e-mail you try to send correct?  And, this is an error 
while performing the send/receive, as opposed to an actual returned mail error received 
later on?

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Shawmail has a blacklist history. http://www.google.com/search?q=shawmail+blacklist Sometimes mail will make it through other times it won't. You should keep after your IP (try mailing direct to postmaster) and/or get a savvy friend to help you route your outgoing mail through an open relay. I use my own mail server and if a mail bounces it gets routed through Comcast.

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