Thunderbird – Sending of message failed

thunderbird-error-01После очередного обновления Fedora некоторые пользователи Thunderbird наткнулись на сообщение:

Send Message Error
Sending of message failed.
The message could not be sent using SMTP server smtp.***.com for an unknown reason. Please verify that your SMTP server settings are correct and try again, or contact your network administrator.
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