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sending emails

My "Send" emails being blocked in both Thunderbird and Apple Mail.

Thunderbird returns the following message:

An error occurred while sending mail. The mail server responded:  5.7.1 Message contains spam or virus or sender is blocked : sound79_8c1949861721. Please check the message and try again

I have checked the message for virus using Malware and AVG, neither show virus.

What to do?

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