Xojo Plugin

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.

Dim email As 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.)
Dim hasBefore As Boolean
hasBefore = email.HasHeaderMatching("X-Custom-Header","*",False)
System.DebugLog("Has X-Custom-Header before: " + Str(hasBefore))

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

Dim hasAfter As Boolean
hasAfter = email.HasHeaderMatching("X-Custom-Header","*",False)
System.DebugLog("Has X-Custom-Header after: " + Str(hasAfter))