dovecot reports:
2019-12-16

Mail with group address as sender will cause a signal 11 crash in push notification drivers. Group address as recipient can cause crash in some drivers.

CVE-2019-19722
dovecot-2.3.9.2v0.tgz

dovecot-mysql-2.3.9.2v0.tgz

dovecot-postgresql-2.3.9.2v0.tgz

dovecot-ldap-2.3.9.2v0.tgz

dovecot-pigeonhole-0.5.9v1.tgz