Reasons why PHP stream_socket_enable_crypto() returns FALSE?
问题 I am setting up a ZF3 SMTP Mail transport to send messages to my own email server which I have set up using PostFix and Dovecot. I keep getting the 'Unable to connect via TLS' error which occurs when the stream_socket_enable_crypto() tries to enable TLS. I tried with another email server (my ISP's email server) using TLS and it worked so it is not my code itself. Since I have been able to connect Outlook to my email server, I know that the connection to smtp:587 to my server works and that