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Servers that host websites aren’t the only ones that need SSL certificates. You need to have an SSL certificate for your mail server, too. But what kinds of SSL certificates work with mail servers? We’ll get to that in just a moment.
First, we want to address what seems to be a bit of a misnomer about email security and encryption. Email signing, or S/MIME certificates, are handled on an account-level basis. With S/MIME certificates, a given account is issued a certificate and can use it to sign and encrypt email. This method encrypts the email itself, but the transmission of the email is not encrypted.
This is only part of the equation when it comes to truly secure email. You want to make sure the email is being SENT securely, too. That involves using an SSL certificate on your mail server to ensure that all incoming mail is received via a secure channel. But why would you need to encrypt the connection an email is sent via if the email itself is encrypted?
There are two reasons important reasons for why you need to install a mail server certificate:
So, install an SSL certificate on your mail server to ensure that not only your messages are secure but the channel you send them through is as well.
As you likely know, SSL certificate come in different validation levels and types — everything from single domain certificates to multi domain and wildcards. However, there is an SSL certificate that are designed to work specifically with Microsoft Exchange and Communications servers. These are known as UCCs, or unified communications certificates. They’re compatible with about 99.9% of email clients and web browsers.
UCC certificates come in two varieties: multi domain and multi domain wildcard certificates. Depending on the number of domains you wish to secure and your validation needs, UCC certificates come in domain validation (DV) and organization validation (OV) capabilities.
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