Enigmail is a security extension to Mozilla Thunderbird and Seamonkey.
It integrates the renowned OpenPGP standard provided by GnuPG.
Sending and receiving encrypted and digitally signed email gets just
simple using Enigmail.
Thunderbird 78 from pkgsrc's 2020Q3 branch, which is supposed to
integrate Enigmail (but maybe not quite fully yet) does not work at all
for me, and Thunderbird 68 is still there anyway. This therefore
re-imports Enigmail for this version.
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