Tell me more ×  I have boldly stated that there is no way to
'write protect' an e-mail, but want to be sure of my ground.
Surely if Joe Bloggs receives an e-mail from me (or my
e-commerce site or a web application written by me) saying - "I
will sell you X for $10 ", he COULD modify that price to, say,
$9, and forward it to someone or save te e-mail, but so what ?
The original e-mail will always be accesible and traceable on
mail servers and a copy in mail clients of all recepients.  So
therefore, there is no need to do this - and anyway it is not
possible.  Is this true ?  share|improve this question This
sounds like you're trying to rationalise not doing a particular
bit of work. Care to explain the context behind this question?
–  Polynomial Jan 14 at 12:32 Thanks. Yes. I'm writing a simple
calculator whereby the user completes an HTML form, we do some
maths on the $_POST-ed array variables and end up with an
'offer', which we then mail to a prospective cc ourselves using
the PHP mail($to, $subject, $mes