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I recently upgraded to SmarterMail 16 and now, when I compose a new message or reply to a message, the body section of the email shows, "NaN". Replying to emails doesn't display the original message, just, "NaN". Pretty sure the "NaN" is a Not a Number error of some form. I'm going to try adding a signature to see if that resolves the issue.
Owner of Efficion Consulting