Signing Emails using Mendix

Greetings, Does anyone have any experience digitally signing emails before sending them over smtp using Mendix? I'm currently using a module called SMTP EmailTemplate,, from the Mendix store, but haven't found any information on the forum or in the documentation of this module regarding sending digitally signed emails. There is information regarding encryption and sending the email, which works fine but nothing on using certificates signing the emails.  Is this possible in Mendix? Has anyone did it before? Thanks in Advance. Kind Regards,   
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