Yup, that's why Diarmaid keeps telling us not to rely on e-mail completely!
I had an e-mail that was wandering aound the 'ethernet' for '647 hrs' once (or so the 
message said) before it bounced back.  I'd talked to the person face-to-face and e-mailed 
back and forth a dozen times before the return!  Needless to say, I'd forgotten what I'd 
sent!
Aoife