Troubleshooting Tip: Error message '454 4.7.0 TLS handshake failed.(Reason:454 4.7.0 TLS handshake failed.)'

From the cross-search log, FortiMail is unable to send outgoing email due to TLS handshake failure:

STARTTLS=client, error: connect failed=-1, reason=unsupported protocol, SSL_error=1, errno=0, retry=-1 timeout waiting for input from mx1.logicit.net. during Draining Input to=<id@domain.com>, delay=00:04:32(tries=1), xdelay=00:04:32, mailer=esmtp, pri=202743, acl_delivery_id=1, relay=mx1.logicit.net. [103.172.xxx.xx], ip-pool=IP-pool(xx.x.xx.xxx), dsn=4.7.0, reply=454 4.7.0 TLS handshake failed., stat=Deferred: 454 4.7.0 TLS handshake failed.(Reason:454 4.7.0 TLS handshake failed.)

Check the domain 'mx1.logicit.net' using a third-party SSL checking tool such as below:

The result shows that the next MTA is having an issue with the SSL certificate.