There seem to be fewer vendors supplying digital certificates for installation on an email client. A more common solution is to rely on an email security gateway that does not require the installation of certificates on the email client.

Purchasing digital certificates for desktop clients seems to be the less popular solution. Some SSL certificate vendors that used to offer certificates for installation on a desktop email client have stopped offering it. Organizations with an email security gateway can have all outbound Internet mail encrypted. 

Purchasing digital certificates for desktop clients seems to be the less popular solution. Some SSL certificate vendors that used to offer certificates for installation on a desktop email client have stopped offering it. Organizations with an email security gateway can have all outbound Internet mail encrypted.