AddHeader Method

AddHeader(name As string, value As string, charset As string)

AddHeader(string name, string value, string charset);

name	type	description
name	string	The name of the header
value	string	The value of the header.
charset	string	(optional) The character set of the value.Avoid using this character set as most email clients can not use it

Adds a new custom header to the email. This can be used for added functions such as urgent or return receipt requests.