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I need help to send emails again.

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I keep getting this message: An error occurred while sending mail. The mail server responded: 5.7.1 <unknown[68.204.200.133]>: Client host rejected: Access denied.

Please check the message recipient...and try again. 

Thunderbird will save emails I want to send in my draft folder but I cannot send them.

I keep getting this message: An error occurred while sending mail. The mail server responded: 5.7.1 <unknown[68.204.200.133]>: Client host rejected: Access denied. Please check the message recipient...and try again. Thunderbird will save emails I want to send in my draft folder but I cannot send them.