Why mail server cannot connect to SSL/TLS SMTP server

[Gaojing Bai]

When I use not SSL/TLS connect to SMPT(port is 25) Server is OK,but when I use SSL/TLS(port is 465) cannot successful send mail,It's bug?

[davelahn]

Hi Gaojing,

As per this doucment, for the port, you will want to specify either 25 or 587. This is because the initial connection to the mail server is not done over SSL. If you have Use SSL/TLS selected, an SSL connection will be negotiated.

Best regards,

Dave