Re: a header authentication scheme

On Fri, Oct 22, 2004, Arnt Gulbrandsen wrote:

> Step 1. I'd send five messages to nosuchuser(_at_)do(_dot_)ma(_dot_)in and 
> wait for the 
> bounces. For each of them, I'd compute the delay from my sending time 
> (using my clock) to the receiving MTA's receive time. Next, I'd average 
> the five values.
Where do you get the time of the server? Many MTAs don't accept
mail for unknown recipients, so it's your MTA that generates the
bounce.