The SendMailUseChannel() function allows messages to be sent from a mapping using a SMTP send channel.

1. Name of the SMTP send channel
2. Recipient address¹⁾
3. Subject
4. message text
5. Attachment²⁾

In the subject and message body, Masks can be used.

SendMailUseChannel('SmtpChannel', 'user@mein.kunde.de', 'EDI file to your document number ${DocumentNumber}', 
'Dear Sir or Madam,

attached is the EDI file related to your document no.  ${DocumentNumber}, received on ${MessageEntryDate:yyyy-MM-dd} 
the message with the subject "${Subject}".

Our ID: ${fn:XVar("DocId")}

Yours sincerely, 
     EDI User
', $SavedEdiFile)