Everything was working configuration wise prior to upgrade. Went form 7.2.2 to 7.3 then to 7.4. Had to remove TLS and authentication requirement on the mail server and in CRM to get it to email without receiving an phpmailer error smtp connect() failed
This was seen a bit in the RC for 7.4 but fixed by calling the classes in the phpmailer.php file which it was on my server.
Below are the email server logs.
Nov 12 07:42:56 phx-XXX postfix/smtpd[15429]: connect from unknown[192.168.X.X]
Nov 12 07:42:56 phx-zimbra01 postfix/smtpd[15429]: Anonymous TLS connection established from unknown[192.168.X.X]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
Nov 12 07:42:57 phx-XXX saslauthd[8521]: do_request : NULL password received
Nov 12 07:42:57 phx-XXX postfix/smtpd[15429]: warning: unknown[192.168.X.X]: SASL LOGIN authentication failed: authentication failure
Nov 12 07:42:57 phx-XXX postfix/smtpd[15429]: disconnect from unknown[192.168.X.X]
There was really no error in Suite logs. Just a phpmailer error to connect and a github url for troubleshooting. Anyone face this and fix it. I relly need to turn up TLS and required authentication.