Classic ASP

Add a Custom Header to an Email Attachment

Demonstrates the Chilkat Email.AddAttachmentHeader method, which adds a custom MIME header field to an existing attachment identified by its zero-based index. This example adds an attachment (which becomes index 0), then attaches an extra header field to it and prints the resulting MIME.

Background: In MIME, every attachment is itself a mini-message with its own small block of headers — things like Content-Type, Content-Disposition, and Content-Transfer-Encoding that describe that specific part. AddAttachmentHeader lets you insert additional fields into that per-part header block, which is occasionally needed for interoperability with systems that look for custom X- headers or content identifiers on individual attachments.

Chilkat Classic ASP Downloads

Download Chilkat for Classic ASP

Classic ASP

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
'  Demonstrates the AddAttachmentHeader method, which adds a custom MIME header field to
'  an existing attachment, identified by its zero-based index.

set email = Server.CreateObject("Chilkat.Email")
email.Subject = "Attachment with a custom header"
email.Body = "The attachment has an extra MIME header."

'  Add an attachment; it becomes attachment index 0.
success = email.AddStringAttachment("data.txt","Attachment body.")

'  Add a custom header field to the first attachment (index 0).
email.AddAttachmentHeader 0,"X-Custom-Attachment-Header","some value"

'  The custom header now appears in the attachment's MIME part.
Response.Write "<pre>" & Server.HTMLEncode( email.GetMime()) & "</pre>"

%>
</body>
</html>