Why am I suddenly receiving the message: 5.1.0 - Unknown address error 501-"5.1.8 Bad sender's system address" I am only getting it for Mozilla Thunderbird

In the past three days, whenever I send a message, it does not go through. Instead, I get the message: 5.1.0 - Unknown address error 501- "5.1.8 Bad sender's system address". I tried downloading the newest version of Thunderbird but it did not work. I do not receive this message when using other software.

I had the look that you suggested. As far as I can tell there are no problems with the user name. Maybe I should check with my email company, Cogeco?

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