Every domain can use our secure server certificate to call up their pages in secure mode (a.k.a. "SSL"). In order to "call up" a page in secure mode, the link to that page must have the "https://" reference (note the 's' on the end) as follows:

https://MachineName.safe-order.net/yourdomain/anypage.html

Where MachineName is the name of the server you are on, which is displayed in the center of the page on your Plusmail Control Panel and yourdomain is your domain name without the .com, etc. extension.