- Thunderbird will now prompt to compact IMAP folders even if the account is online
- Complete fix of the EFAIL vulnerability: 1) Removing some HTML crafted to carry out an attack. 2) Optionally: Not decrypting subordinate message parts that otherwise might reveal decryted content to the attacker. Preference mailnews.p7m_subparts_external needs to be set to true for added security.
- Fixed various problems when forwarding messages inline when using "simple" HTML view
- Various security fixes
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