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.conf should fix you right up:

TLS_CA_File=/etc/pki/tls/certs/ca-bundle.crt

you should now find things succeeding in the logs:

sSMTP: Creating SSL connection to host
sSMTP: SSL connection using RC4-SHA
sSMTP: Sent mail for foo@example.com (221 2.0.0 closing connection - gsmtp) uid=0 outbytes=500

Magic!