Just installed 3CX phone system v15.0.0 on Windows10. Installation went smooth. All appears to be working without a glitch. Except for my e-mail settings. I just cannot get e-mail to work. I am using a standard gmail account without 2-factor authentication. If I test with: smtp.gmail.com => 3CX states "invalid external certificate" smtp.gmail.com:587 => the port number 587 disappears from the settings (!??) and 3CX states "invalid external certificate" smtp/gmail.com:465 => the port number is stored in the settings as expected but 3CX states "Operation cancelled" I am stuck; anybody who can help?