I have just tested with Thunderbird 52.9.1 (64 bit) on Mac OS 10.13.6 and the same issue exists there, so this is not unique to Ubuntu. I have just reported this to Mozilla at <https://bugzilla.mozilla.org/show_bug.cgi?id=1477357>.
** Bug watch added: Mozilla Bugzilla #1477357 https://bugzilla.mozilla.org/show_bug.cgi?id=1477357 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to thunderbird in Ubuntu. https://bugs.launchpad.net/bugs/1677335 Title: Outgoing mail is always windows-1252 encoded by default Status in thunderbird package in Ubuntu: New Bug description: Thunderbird 45.8.0 Ubuntu 16.04 When composing or replying in Thunderbird, the default encoding is Western (Windows-1252) regardless of the setting of Edit -> Preferences -> Display -> Advanced -> Text Encoding. It doesn't matter that the setting for Outgoing Mail: is "Western (ISO-8859-1)" or "Western (Windows-1252)", either way the outgoing message is windows-1252 encoded. If the setting for Outgoing Mail: is "Unicode (UTF-8)", then the outgoing message is utf-8 encoded, so that works. It is only "Western (ISO-8859-1)" that doesn't work. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1677335/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
