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See https://www.thunderbird.net/en-US/thunderbird/68.10.0/releasenotes/ Fixes https://www.mozilla.org/en-US/security/advisories/mfsa2020-26/ Note that even if thunderbird 78 is being released soon, our port will only be updated to the 78 branch when upstream reaches 78.2 and encryption is enabled by default, superseding enigmail.