Hi Derek, If A uses a PGP signature, and B forwards the mail intact, without cutting off the signature, that will give you a check as to the real origin of the message. It really only works if you trust A's signature, but if you do, it's the only way I know of checking. PGP-Mime is available for Thunderbird, and there is probably a way of implementing it in Outlook but I don't know it. If B forwards the mail with headers, that gives you a second check - but most mail clients cut the original full headers off forwarded mail. Cheers, -- Patricia Fraser International Sales Manager Quantum Technology UK Tel: +44 (0)160 470 5680 Fax: +44 (0)870 705 9646 www.quantech.com.au > (a sends an email to (b > (b forwards that email to (c > Is there a way (c can be 100% sure the forwarded email truly did originally > come from (a ? > > I know (c can check header for the mail from (b, but I cannot see how > one can check that what (b has passed on is truly what (a sent. > > Regards, Derek ** To leave the list, click on the immediately-following link:- ** [mailto:access-uk-request@xxxxxxxxxxxxx?subject=unsubscribe] ** If this link doesn't work then send a message to: ** access-uk-request@xxxxxxxxxxxxx ** and in the Subject line type ** unsubscribe ** For other list commands such as vacation mode, click on the ** immediately-following link:- ** [mailto:access-uk-request@xxxxxxxxxxxxx?subject=faq] ** or send a message, to ** access-uk-request@xxxxxxxxxxxxx with the Subject:- faq