** Description changed:

  IMAP connection to imap.gmail.com over SSL returns self-signed
  certificate. Though you can still connect to imap.gmail.com using this
  certificate, it would be better to fix it to avoid this scary warning
  (self-signed certificate) and provide a smoother user experience.
  
  Test Case
- Install sylpheed. Start sylpheed. Create IMAP account for gmail.com in 
sylpheed (IMAP4 (Gmail)). Check for new email. You should get a warning 
complaining about self-signed certificate.
+ Create IMAP account for gmail.com in sylpheed. To do this, select "Create new 
account" from the "Configuration" in the main menu. "New account setup" window 
will appear. Select "IMAP4 (Gmail)" and follow instructions in that window. 
After setup is finished check for new email for newly created account. You 
should get a warning complaining about self-signed certificate.
  With fixed package, try the same. This time you should not get the warning.
  
  Original Description
  --------------------
  Problem appeared after upgrading from Ubuntu 18.04 to 18.10.
  When starting Sylpheed, connecting to imap.gmail.com over SSL, I get a 
warning embedded in the SSL certificate:  "Subject: /OU=No SNI provided; please 
fix your client./CN=invalid2.invalid "
  
  May be related to this bug report about 'fetchmail' in redhat enterprise when 
it was still using TLSv1.2 instead of TLSv1.3:
  https://bugzilla.redhat.com/show_bug.cgi?id=1611815
  
https://gitlab.com/fetchmail/fetchmail/commit/9b8b634312f169fab872f3580c2febe5af031615
  
  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: sylpheed 3.5.1-1ubuntu3
  ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
  Uname: Linux 4.18.0-10-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.10-0ubuntu13
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Tue Oct 23 00:27:01 2018
  InstallationDate: Installed on 2016-06-05 (869 days ago)
  InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  SourcePackage: sylpheed
  UpgradeStatus: Upgraded to cosmic on 2018-10-21 (1 days ago)
  modified.conffile..etc.default.apport: [modified]
  mtime.conffile..etc.default.apport: 2018-03-20T22:16:27.108498

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https://bugs.launchpad.net/bugs/1799345

Title:
  Sypheed not (or no longer) using SNI for SSL connections

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