while working with a MailItem before Sending it I cant solve the following
problem:
I want to Add a UserProperty to the Outgoing Mail, like shown below. This is
no Problem unless I Use a
Field Name which includes a _,[ or ]. The same Problem appears in
VBSrcipt -> Designig  a Form -> New User-defined Field -> NEW.

Q. Is there a way to add a Field to the Mail using any Name?

*****************
Code:
 Set objMailItem = objMailItem.UserProperties.Add("WHAT_EVER_NAME", olText)
*****************

Thanks for help.

P.S. I appreaciate any Solution hint, no matter how difficult.