[Bug 1917341] Re: Thunderbird 78.1 cannot send mail

[Olivier Tilloy]

This appears to be a known issue, where some servers don't support the
minimum TLS version requested by this new version of Thunderbird. See
https://support.mozilla.org/en-US/questions/1295861 for details. TLDR:
in the configuration editor, change "security.tls.version.min" to "2".

** Changed in: thunderbird (Ubuntu)
       Status: New => Invalid

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Title:
  Thunderbird 78.1 cannot send mail

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