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Thunderbird has started giving me error messages when I try to send some emails. My server (Comcast) settings are correct.

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sospanyol
sospanyol
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I've been using Thunderbird email without problem for about a year. Suddenly, Thunderbird has been giving me error messages when I try to send SOME (not all) emails. My server (Comcast) settings are correct and haven't been changed. I don't even understand the error message!

I've been using Thunderbird email without problem for about a year. Suddenly, Thunderbird has been giving me error messages when I try to send SOME (not all) emails. My server (Comcast) settings are correct and haven't been changed. I don't even understand the error message!
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Matt
Matt
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Duplicated here https://support.mozilla.org/en-US/questions/1249595