I wanted to make a request to laminas-mail directly, but I saw, the latest version of laminas-mail solves this error.
laminas-mail 2.18.0 connect to mail servers with stream_socket_client(), not using fsockopen(). So there is a solution to disable certificate validation.
KevinTheJedi
I made a pull request to update laminas-mail to 2.18.0 and disabled the validation. Please see at:
https://github.com/osTicket/osTicket/pull/6312
There is already a pull request to update laminas-mail, but I removed all development dependencies.
So laminas-mail includes less than 500 files by using 3,5 MB...
laminas-mail should not have more files as osTicket itself.
Please merge this request for the next release.

      KevinTheJedi
      Hi,

      We are confirming that the above change proposed by jens_E is also working for us.

      Realized that this thread is apparently covering two separate issues. :]

      Thank you!

          Hi sushpep

          are you using IMAP? What did you canged? Line 91 in Imap.php?

          We've tried but does not work for us.

          Without change we get:

          And if we change as jens_E described the is no error shown but mails aren't fetched.

          Regards!

                And your cronJob is enabled?
                You can set your log level to debug in Settings->System.
                Then you can see, if the cron runs in your system log. There should be an entry for it...

                  jens_E

                  Hmmmm....
                  Looks like i run into another issue:
                  If i start the job manually i get:

                  ###############
                  /home/ticketing/public_html/api/cron.php
                  PHP Fatal error: Abstract function osTicket\Mail\MailBoxProtocolTrait::oauth2Auth() cannot be declared private in /home/ticketing/public_html/include/class.mail.php on line 238
                  ###############

                    a month later

                    @jens_E @KevinTheJedi
                    I've updated to 1.17.1
                    Same error. Edited Imap.php again. No more error but mails aren't fetched!
                    So something has changed with 1.17.1 but not for good. :/

                    For now i revert to last snapshot to get it working again. But a final solution would be great.

                    8 days later

                    Hi,
                    short update. With 1.17.2 the problem still persists:

                    Manual edit of Imap.php fixed it again.

                    Regards!
                    Gero

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