(Xojo Plugin) Create Non-Multipart Email with XML Body that is an Attachment

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Creates an email where the only body is a binary WAV file. The technique used in the example could be applied to other binary files, such as PDF, MS-WORD docs, Excel docs, etc.

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// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// The goal of this example is to create an email that has this MIME format,
// where the body of the email is XML using base64 encoding, 
// and the Content-Type and Content-Disposition are set as indicated.

// Date: Wed, 23 Aug 2023 09:01:52 +0200 (CEST)
// From: joe@example1.com
// Subject: [v=EMCS.NL][a=NL****][k=****][s=0]
// To: mary@example2.com
// MIME-Version: 1.0
// Content-Type: application/octet-stream; charset=us-ascii; name=6bd8dfe259b3a42c90a28a82b5fc6e77.txt
// Content-Transfer-Encoding: Base64
// Content-Disposition: attachment; filename=6bd8dfe259b3a42c90a28a82b5fc6e77.txt
// Message-Id: <......>
// 
// <multi-line base64 encoded XML here>

Dim success As Boolean
success = True

Dim xmlBody As String
xmlBody = "<ie:IE801 xmlns:ie=""urn:publicid:-:EC:DGTAXUD:EMCS:PHASE4:IE801:V3.01"" xmlns:tms=""urn:publicid:-:EC:DGTAXUD:EMCS:PHASE4:TMS:V3.01"">....</ie:IE801>"

Dim email As New Chilkat.Email

// Add subject, TO, FROM, etc.
email.Subject = "[v=EMCS.NL][a=NL****][k=****][s=0]"
email.From = "joe@example1.com"
success = email.AddTo("Mary","mary@example2.com")

email.Body = xmlBody

email.AddHeaderField "Content-Transfer-Encoding","Base64"
email.AddHeaderField "Content-Type","application/octet-stream; charset=us-ascii; name=6bd8dfe259b3a42c90a28a82b5fc6e77.txt"
email.AddHeaderField "Content-Disposition","attachment; filename=6bd8dfe259b3a42c90a28a82b5fc6e77.txt"

// Your email is ready to send
Dim mailman As New Chilkat.MailMan

mailman.SmtpHost = "smtp.my_mail_server.com"
mailman.SmtpUsername = "myUsername"
mailman.SmtpPassword = "myPassword"
mailman.SmtpPort = 465
mailman.SmtpSsl = True
mailman.StartTLS = True

success = mailman.SendEmail(email)
If (success <> True) Then
    System.DebugLog(mailman.LastErrorText)
    Return
End If

success = mailman.CloseSmtpConnection()
If (success <> True) Then
    System.DebugLog("Connection to SMTP server not closed cleanly.")
End If

System.DebugLog("Mail Sent!")