if youre that worried about the security of a message that youre sending to somebody whose real identity you possibly dont even know, then disable PMs via your userCP, simples
and instead, use royal mail, where any number of unknown people could choose to simply open the envelope you PAY to send secure in the knowledge that itll get there untouched......
the actual PRIVATE MESSAGING system could also easily be seen as a message not posted openly in public, instead of a classified communication between 2 parties
you CAN disable this 'risk' to yourself easily enough though
and instead, use royal mail, where any number of unknown people could choose to simply open the envelope you PAY to send secure in the knowledge that itll get there untouched......
the actual PRIVATE MESSAGING system could also easily be seen as a message not posted openly in public, instead of a classified communication between 2 parties
you CAN disable this 'risk' to yourself easily enough though