[Simply Computers] Rebounded Mail

 

I tried to send a message to an email address, as follows: courses@commsupport.co.uk

I got a rebounded notification:

----- The following addresses had permanent fatal errors -----
<courses@commsupport.co.uk>
(reason: 550-Your IP address is on the RBL blacklist! Sending denied. )

----- Transcript of session follows -----
... while talking to mail.commsupport.co.uk.:
<<< 550-Your IP address is on the RBL blacklist! Sending denied.
<<< 550-For further information and delisting procedure,
<<< 550 please see http://www.spamcop.net/w3m?action=checkblock&ip=216.200.145.36
554 5.0.0 Service unavailable

What is a "RBL blacklist", and can somebody tell me what this message means, or why my attempt to send it failed

Thanks
Andre Li

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