Mailer: Other SMTP
SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting
Debug Output:
Connection: opening to zimbra.aviointeriors.it:25, timeout=300, options=array()
Connection failed. Error #2: stream_socket_client(): unable to connect to zimbra.aviointeriors.it:25 (No route to host) [/domains/www.aviointeriors.it/html/wp-includes/PHPMailer/SMTP.php line 388]
SMTP ERROR: Failed to connect to server: No route to host (113)
SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting