IMAPFilter through 2.6.12 does not validate the hostname in an SSL certificate.
{ "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro", "ubuntu_priority": "medium", "binaries": [ { "binary_version": "1:2.5.2-2+deb8u1build0.14.04.1~esm1", "binary_name": "imapfilter" } ] }
{ "ubuntu_priority": "medium" }
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_version": "1:2.6.13-1", "binary_name": "imapfilter" }, { "binary_version": "1:2.6.13-1", "binary_name": "imapfilter-dbgsym" } ] }