Marco Fioretti writes:
Thanks to David for answering so fast to the OP and me.
I just realized something else, however: if the message was digitally
signed, will this kind of massaging make signature verification
meaningless?
Yes, because you are changing the message content. A digital signature
(e.g. PGP/MIME, S/MIME) is much like a checksum over the complete mail
body.
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