Hello,
Having problem with Newsletter sending mails, I did the Mailtrap test and the following is the error report
2017-12-03 13:05:08 Connection: opening to smtp.mailtrap.io:25, timeout=300, options=array (
)
2017-12-03 13:05:11 Connection: Failed to connect to server. Error number 2. "Error notice: stream_socket_client(): unable to connect to smtp.mailtrap.io:25 (Connection refused)
2017-12-03 13:05:11 SMTP ERROR: Failed to connect to server: Connection refused (111)
2017-12-03 13:05:11 SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting