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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https://bugs.launchpad.net/bugs/1917341
Title:
Thunderbird 78.1 cannot send mail
Status in thunderbird package in Ubuntu:
Invalid
Bug description:
I ran update-manager on28 Feb 2020 and rebooted my laptop. Since then
I am unable to send mail. Another machine that is still running
Thunderbird 68.10 has no problems with exactly the same server
settings.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: thunderbird 1:78.7.1+build1-0ubuntu0.20.04.1
ProcVersionSignature: Ubuntu 5.4.0-66.74-generic 5.4.86
Uname: Linux 5.4.0-66-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
BuildID: 20210203182138
CasperMD5CheckResult: skip
CurrentDesktop: XFCE
Date: Mon Mar 1 17:40:31 2021
DefaultProfileExtensions: extensions.sqlite corrupt or missing
DefaultProfileIncompatibleExtensions: Unavailable (corrupt or non-existant
compatibility.ini or extensions.sqlite)
DefaultProfileLocales: extensions.sqlite corrupt or missing
DefaultProfilePrefErrors: Unexpected character ',' before close parenthesis @
/usr/lib/thunderbird/omni.ja:greprefs.js:732
DefaultProfileThemes: extensions.sqlite corrupt or missing
InstallationDate: Installed on 2018-02-09 (1116 days ago)
InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64
(20160719)
Profiles:
Profile1 (Default) - LastVersion=None/None (Out of date)
Profile0 - LastVersion=78.7.1/20210203182138 (In use)
SourcePackage: thunderbird
UpgradeStatus: Upgraded to focal on 2020-10-09 (143 days ago)
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