SMIMEA messages often contain a certificate (some messages contain more than one certificate). These certificates assist in authenticating the sender of the message and can be used for encrypting messages that will be sent in reply. In order for the SMIME receiver to authenticate that a message is from the sender identified in the message, the receiver's Mail User Agent (MUA) must validate that this certificate is associated with the purported sender. Currently, the MUA must trust a trust anchor upon which the sender's certificate is rooted and must successfully validate the certificate. There are other requirements on the MUA, such as associating the identity in the certificate with that of the message, that is out of scope for this document.
The SMIMEA record has the following look in your DNS zone management page:
| Host | Type | Points to: | TTL |
| www.domain.com | SMIMEA | 0 0 0 keyKEY1234keyKEY | 1 Hour |
Log in to your ClouDNS account, enter your DNS zone management page, and click on the Add new record button. For Type choose "SMIMEA" and type as follow:
*This hostname is used as an example.
ClouDNS provides full support for SMIMEA records for all our DNS services, including the listed below. Just write to our technical support, if you need any assistance with your SMIMEA records configuration. Our Technical Support team is online for you 24/7 via live chat and tickets.