Bad news Rusty I've tested signing E-Mail some more after my last messages and found that MailServer is changing Signed POP mail somewhere so that when the user receives the mail he gets a "message has been tampered with" security warning.
What I did was to set up a POP/SMTP Server on an IBM PC then sent a signed E-Mail Message from another PC direct into it, I then sent another message from the same PC direct into the TF Mail Server.
I then collected the E-Mail from each account and found that only the E-Mail from TF MailServer gave the Security Warning.
