Can't send unencrypted mail in Thunderbird 78.4.0
Since updating to Thunderbird 78.4.0 Some of my emailaccounts won't send unencrypted emails even though I have specified "don't encrypt" in the server settings.
Gekose oplossing
Thunderbird has debug logging, which might help.
https://wiki.mozilla.org/MailNews:Logging
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Gekose oplossing
Thunderbird has debug logging, which might help.
Thanks for your suggestion. However, the problem turned out to be with my mail server. It happened coincidentally with the software upgrade.