Add a Custom Header Field to an Email

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Demonstrates the Chilkat Email.AddHeaderField method, which adds a standard or custom header field. If the field already exists, this method replaces it (use AddHeaderField2 to allow duplicates). Header fields whose names begin with CKX- are not transmitted when the email is sent, but are preserved across XML save/load, making them handy for persistent metadata. This example adds a custom X- header and reads it back.

Background: Beyond the well-known headers (From, Subject, etc.), MIME lets you add arbitrary fields. By convention custom, non-standard fields are prefixed with X-, so mail systems know not to expect them in the standards. Applications use these to carry tracking IDs, campaign tags, or routing hints. Chilkat's CKX- convention goes a step further — those fields live with the object but are stripped before the message is actually sent.

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//  Demonstrates the AddHeaderField method, which adds a standard or custom header field.
//  If the header field already exists, this method REPLACES it.  (To allow duplicates,
//  use AddHeaderField2 instead.)  Header fields whose names begin with "CKX-" are not
//  transmitted when the email is sent, but are preserved when saved to/loaded from XML.

Chilkat.Email email = new Chilkat.Email();
email.Subject = "Custom header example";
email.From = "alice@example.com";

//  Add a custom header field.
email.AddHeaderField("X-Custom-Header","custom value");

Debug.WriteLine("X-Custom-Header = " + email.GetHeaderField("X-Custom-Header"));