sSMTP Certificate Fix for "send-mail: Cannot open smtp.gmail.com:587"
If your sSMTP is configured to use gmail is giving you the following error: send-mail: Cannot open smtp.gmail.com:587 and in /var/log/maillog you see: sSMTP: SSL not working: certificate verify failed (20) sSMTP: Cannot open smtp.gmail.com:587 adding below line to /etc/ssmtp/ssmtp.