Direct TCP connections to remote SMTP/SSL servers (port 465) succeed, but do not receive the expected content. 
The client received an empty response instead of our normal banner. This suggests that a firewall, proxy, or filter initially allowed the connection and then terminated it, either because it did not understand our server's reply or decided to block the service.
Direct TCP connections to remote IMAP/SSL servers (port 993) succeed, but do not receive the expected content. 
The client received an empty response instead of our normal banner. This suggests that a firewall, proxy, or filter initially allowed the connection and then terminated it, either because it did not understand our server's reply or decided to block the service
Direct TCP connections to remote POP/SSL servers (port 995) succeed, but do not receive the expected content. 
The client received an empty response instead of our normal banner. This suggests that a firewall, proxy, or filter initially allowed the connection and then terminated it, either because it did not understand our server's reply or decided to block the service.