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Simple MIME: Set alternative body texts
Usually, HTML messages also provide plain text parts. Those parts are used by e-mail programs which are unable to show a HTML text. It is very easy to create a message with such alternative text parts: just use both BodyPlain and BodyHTML properties of TElSimpleMIMEMessage:
C#:
message.BodyPlain.Text = "Just a test message";
message.BodyHTML.Text = @"<html><head></head><body><cite>Just a test message</cite></body></html>";