Thanks for posting this information! I'll give it a try soon as I ran into this with a friend who runs Thunderbird 60.9.0 on Windows 10.tanstaafl wrote:In tools -> options -> advanced -> general press the config editor button and then type mail.strictly_mime in the search field. What does it say that setting is set to? Changing that from false to true has solved similar problems when sending accented characters with yahoo/ymail/aol/verizon SMTP servers. Those SMTP servers claim they support 8BITMIME but actually just support UTF-8.
Thanks!
EDIT: Ok, so I made the change and it worked perfectly! Thanks again!
Peace...