imapfilter fails to set SNI

[William Woodruff]

This is a dupe of Debian #907193 (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=907193) and Red Hat 1713160 (https://bugzilla.redhat.com/show_bug.cgi?id=1713160).

The bug occurs with at least imapfilter v2.6.11 (distributed with 18.04) and probably older versions. A fix appears in v2.6.12, and Debian has their own patch.

What I expected to happen:

A successful connection to imap.google.com.

What actually happens:

A prompt as follows:

Server certificate subject: /OU=No SNI provided; please fix your client./CN=invalid2.invalid
Server certificate issuer: /OU=No SNI provided; please fix your client./CN=invalid2.invalid
Server certificate serial: FFFFFFFFFFFFFFFF
Server key fingerprint: 90:4A:C8:D5:44:5A:D0:6A:8A:10:FF:CD:8B:11:BE:16
(R)eject, accept (t)emporarily or accept (p)ermanently?

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: imapfilter 1:2.6.11-1build1
ProcVersionSignature: Ubuntu 4.15.0-109.110-generic 4.15.18
Uname: Linux 4.15.0-109-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.15
Architecture: amd64
Date: Tue Jul 7 09:49:29 2020
InstallationDate: Installed on 2014-04-18 (2271 days ago)
InstallationMedia:

ProcEnviron:
 TERM=screen
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: imapfilter
UpgradeStatus: Upgraded to bionic on 2020-07-02 (4 days ago)

[Agathe Porte (gagath)]

The oldest minimum version in currently supported Ubuntu versions is 1:2.6.16-1 in focal, which should have this bug fixed.