Public bug reported:

After upgrading from PHP5 to PHP7.2 (from Bionic), calling imap_open() against 
Google's Gmail servers stopped working.
After researching, I've found that new OpenSSL version introduced 
TLSv13-related breaking changes.

Here are the relevant issues:
With PHP: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=916041
In fetchmail (solved): 
https://bugs.launchpad.net/ubuntu/+source/fetchmail/+bug/1798786

OpenSSL upstream devs have issues related to this:
https://github.com/openssl/openssl/issues/5944
https://github.com/openssl/openssl/pull/5947

Looks like to me that either adding the SNI server name to the openssl
open call would be needed, as done on fetchmail.

** Affects: php-imap (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: uw-imap (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

- After upgrading from PHP5 to PHP7, calling imap_open() against Google's Gmail 
servers stopped working.
+ After upgrading from PHP5 to PHP7.2 (Bionic), calling imap_open() against 
Google's Gmail servers stopped working.
  After researching, I've found that new OpenSSL version introduced 
TLSv13-related breaking changes.
  
  Here are related issues:
  With PHP: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=916041
  In fetchmail (solved): 
https://bugs.launchpad.net/ubuntu/+source/fetchmail/+bug/1798786
  
  OpenSSL upstream devs have issues related to this:
  https://github.com/openssl/openssl/issues/5944
  https://github.com/openssl/openssl/pull/5947
  
  Looks like to me that either adding the SNI server name to the openssl
  open call would be needed, as done on fetchmail.

** Description changed:

- After upgrading from PHP5 to PHP7.2 (Bionic), calling imap_open() against 
Google's Gmail servers stopped working.
+ After upgrading from PHP5 to PHP7.2 (from Bionic), calling imap_open() 
against Google's Gmail servers stopped working.
  After researching, I've found that new OpenSSL version introduced 
TLSv13-related breaking changes.
  
  Here are related issues:
  With PHP: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=916041
  In fetchmail (solved): 
https://bugs.launchpad.net/ubuntu/+source/fetchmail/+bug/1798786
  
  OpenSSL upstream devs have issues related to this:
  https://github.com/openssl/openssl/issues/5944
  https://github.com/openssl/openssl/pull/5947
  
  Looks like to me that either adding the SNI server name to the openssl
  open call would be needed, as done on fetchmail.

** Description changed:

  After upgrading from PHP5 to PHP7.2 (from Bionic), calling imap_open() 
against Google's Gmail servers stopped working.
  After researching, I've found that new OpenSSL version introduced 
TLSv13-related breaking changes.
  
- Here are related issues:
+ Here are the relevant issues:
  With PHP: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=916041
  In fetchmail (solved): 
https://bugs.launchpad.net/ubuntu/+source/fetchmail/+bug/1798786
  
  OpenSSL upstream devs have issues related to this:
  https://github.com/openssl/openssl/issues/5944
  https://github.com/openssl/openssl/pull/5947
  
  Looks like to me that either adding the SNI server name to the openssl
  open call would be needed, as done on fetchmail.

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https://bugs.launchpad.net/bugs/1834340

Title:
  Possible regression on libssl upgrade when using TLSv1.3

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