Updated enigmail packages has been released for Debian GNU/Linux 10 after it turned out that the newer version of Thunderbird (DSA 4571-1) was incompatible with the old package.

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Debian Security Advisory DSA-4571-2 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
November 24, 2019 https://www.debian.org/security/faq
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Package : enigmail

DSA 4571-1 updated Thunderbird to the 68.x series, which is incompatible
with the Enigmail release shipped in Debian Buster.

For the stable distribution (buster), this problem has been fixed in
version 2:2.1.3+ds1-4~deb10u2.

We recommend that you upgrade your enigmail packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/