CreateSimpleAttachment method is a one-line-command that
can be used in your applications to create email message
that has two parts: text part and one attachment. Message
will not be sent. You can add more attachments if needed
using Message.Attach method. You can
also change message headers, or any other field
necessary.
It is not required to use CreateSimpleAttachment method
to send such message - you can create similar message from
scratch using appropriate properties and methods. By using
this method, wodSmtp creates 'template' message and
puts appropriate values to appropriate parts.
To finally send the message, use SendMessage
method.