Remove a Header Field from an Email

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Demonstrates the Chilkat Email.RemoveHeaderField method, which removes by name all occurrences of a header field. Header-field names are case-insensitive, and every repeated occurrence with the given name is removed. This example adds a custom header, then removes it.

Background: Editing a message sometimes means deleting a header outright — stripping a tracking header, removing an X- flag before forwarding, or clearing a stale field before re-sending. Because a field name can appear more than once (like Received), RemoveHeaderField removes all matching occurrences in one call rather than just the first.

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//  Demonstrates the RemoveHeaderField method, which removes by name all occurrences of a
//  header field.  Header-field names are case-insensitive.

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

email.AddHeaderField("X-Custom-Header","some value");

//  Use HasHeaderMatching to test for the header's presence.  ("*" matches any value.)
bool hasBefore = email.HasHeaderMatching("X-Custom-Header","*",false);
Debug.WriteLine("Has X-Custom-Header before: " + Convert.ToString(hasBefore));

//  Remove all occurrences of the header field.
email.RemoveHeaderField("X-Custom-Header");

bool hasAfter = email.HasHeaderMatching("X-Custom-Header","*",false);
Debug.WriteLine("Has X-Custom-Header after: " + Convert.ToString(hasAfter));