common/session.c in Claws Mail before 3.17.6 has a protocol violation because suffix data after STARTTLS is mishandled.
https://security.gentoo.org/glsa/202007-56
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00013.html
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00051.html
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00060.html
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00002.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00090.html