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Help with Mailsleuth

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I have installed Mailsleuth from the Mozilla Add-on website and when I right click on the email in the inbox the email that is to be sent to Mailsleuth I get the following message:

An error occurred while sending mail. The mail server responded: 5.1.8 - Invalid email domain for: trace-request@mailsleuthonline.com [R0109008].

Please check the message recipient "trace-request@mailsleuthonline.com" and try again.
I have installed Mailsleuth from the Mozilla Add-on website and when I right click on the email in the inbox the email that is to be sent to Mailsleuth I get the following message: An error occurred while sending mail. The mail server responded: 5.1.8 - Invalid email domain for: trace-request@mailsleuthonline.com [R0109008]. Please check the message recipient "trace-request@mailsleuthonline.com" and try again.

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Mailsleuth
Total of 7 reviews for this add-on. First 4 dated in 2011, 2012 and 2013 were 5 star 'raves?', but the last 3 indicate that the users were having problems.

Links to the developer's site are not working. He may have closed his site down.

https://addons.mozilla.org/en-US/seamonkey/addon/mailsleuth/

TB-38.3 Win10-PC