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.