Add method will add new part to the message. Part
will be empty, and you will be able to add new Headers and set
Text for the
part.
You must not violate mail specification for the message
you will add to part. It has to be regular message - it
must have headers, one empty line, and text. If there are
no headers - you're doing something wrong, because
wodSmtp will be unable to parse it correctly (it will loop
through message trying to locate any header, and will fail
to do so).
You should not use this method unless you're 100%
sure what you're doing. Usually, you can add parts you
need using PlainText and
HTMLText
properties, and Attach method -
wodSmtp will create appropriate parts for you.