Debian LTS: DLA-1657-1: debian-security-support enigmail end of life
Summary
While Enigmail is still available on addons.mozilla.org, we do not
recommend that package is used, as downloads and executes arbitrary
binaries from the internet without the user's knowledge. It also doesn't
respect's Debian commitment to free software, in that it is not
buildable from source.
We instead recommend you upgrade workstations needing Enigmail to Debian
stretch where proper updates are available.
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
Package :debian-security-support