v4.0.0pre3

• now requires at least Thunderbird 78
• fixed incompatibility with Thunderbird 78 (#199)
• removed option to show DKIM result in the statusbarpanel
• Authentication-Results header: fixed parsing of version

Changes since v4.0.0pre2:

• Sign rules now work (some limitations still apply)
• Fix parsing of from header (#218)

Known issues:

• Storing of DKIM keys not implemented
• Sign rules: DMARC heuristic not implemented
• Sign rules: Special treatment of outgoing messages not implemented
• DKIM action in the header not implemented

Removed:

• Option to show DKIM result in the statusbarpanel