The mailto URL scheme is used to designate the Internet mailing address of an individual or service. No additional information other than an Internet mailing address is present or implied.
A mailto URL takes the form:
where <rfc822-addr-spec> is (the encoding of an) addr-spec, as specified in RFC 822 . Within mailto URLs, there are no reserved characters.
Note that the percent sign ("%") is commonly used within RFC 822 addresses and must be encoded.
Unlike many URLs, the mailto scheme does not represent a data object to be accessed directly; there is no sense in which it designates an object. It has a different use than the message/external-body type in MIME.