Thunderbird issue after update 78.9.0
I am facing problem after updating my thunderbird to 78.9.0.The issue is When I send an Email to a contact Group which I created, if one mail box full all the other mails also returned and not sent. Its not happened earlier Versions.
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Maybe this website will help you: - https://www.uslsoftware.com/go-back-to-the-older-version-of-thunderbird/ or: - https://support.mozilla.org/de/kb/probleme-senden-und-empfangen-nachrichten but this side is in German.