### A.1.1. CAA contactemail Property
SYNTAX: `contactemail `
The CAA contactemail property takes an email address as its parameter. The entire parameter value MUST be a valid email address as defined in RFC 6532, Section 3.2, with no additional padding or structure, or it cannot be used.
The following is an example where the holder of the domain specified the contact property using an email address.
```DNS Zone
$ORIGIN example.com.
CAA 0 contactemail "domainowner@example.com"
```
The contactemail property MAY be critical, if the domain owner does not want CAs who do not understand it to issue certificates for the domain.