Gmail doesn’t work anymore?

Hi there! Have been using your great plugin for ages, thanks a lot for your work!

Could it be possible, that the last update broke the Gmail functionality? If I send a test-mail, I get the following debug message:

2016-12-20 18:38:37	Connection: opening to ssl://smtp.gmail.com:465, timeout=300, options=array (
                   	                  )
2016-12-20 18:38:37	SMTP ERROR: Failed to connect to server:  (0)
2016-12-20 18:38:37	SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting