yes, that would be the simplest way.. but I need to document, in order to
cover my a _ _ that the person did receive my email.
Realistically, there's no physical way to prove a recipient reads his or her
mail. The best you can do is prove SOMETHING opened the message (and that
something could be a program and not a person) and then only if the
recipient's PC allows whatever method you choose. Some mailers, for
example, try using web beacons in the messages in an attempt to have the
recipient's mail client to report when a message is opened. A properly
configured PC won't honor those, either.