Description

   You can use MAIL$SEND_ADD_BODYPART to specify a file that
   contains the entire message or to add a single record to a
   message. If the message is contained in a file, you call
   MAIL$SEND_ADD_BODYPART once, specifying the file name. If
   you want to add to the message record-by-record, you can call
   MAIL$SEND_ADD_BODYPART repeatedly, specifying a different record
   each time until you complete the message.

   You cannot specify both a file name and a record for the same
   message. You can specify either MAIL$_SEND_FILENAME or MAIL$_
   SEND_FID once, or you can specify MAIL$_SEND_RECORD one or more
   times.