You cannot do that using MAPI. I'm not sure you can do that with Outlook automation either but I could be wrong.

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>I don't know how to add the signature to the end of the message body. I mean with the signature that one is defined by the user in the outlook. What commands should I use?
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>I would like to write the message body over a letter paper (or wall paper) that is defined by the user as standart in the outlook.