Classic ASP

Remove a Header Field from an Email

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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Classic ASP

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
'  Demonstrates the RemoveHeaderField method, which removes by name all occurrences of a
'  header field.  Header-field names are case-insensitive.

set email = Server.CreateObject("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.)
hasBefore = email.HasHeaderMatching("X-Custom-Header","*",0)
Response.Write "<pre>" & Server.HTMLEncode( "Has X-Custom-Header before: " & hasBefore) & "</pre>"

'  Remove all occurrences of the header field.
email.RemoveHeaderField "X-Custom-Header"

hasAfter = email.HasHeaderMatching("X-Custom-Header","*",0)
Response.Write "<pre>" & Server.HTMLEncode( "Has X-Custom-Header after: " & hasAfter) & "</pre>"

%>
</body>
</html>