Load method will load predefined message from the disk,
and parse it internally so it can be changed and sent to
SMTP server. wodSmtp may slightly change the message when
it loads it, so it can "fit" into its
collections, but resulting message that is sent to SMTP
server should not change in its contents.
When message is loaded, you can access its Headers, you can
change Parts,
PlainText,
HTMLText
etc.. You can also Attach files to the
message before it's sent.
When loaded, message is kept in the memory as long as
wodSmtp exists - or until new message is loaded.