[dns-wg] DNS RMX records - e-mail sender authorization

At 1:41 PM +0200 2003/10/15, hadmut at danisch.de wrote:

>  I see. Would you mind if I use "From: bortzmeyer at nic.fr" when I am at
>  home?

	You can use whatever you want.  There's nothing anyone can do to 
stop you.  Moreover, the header "From:" is totally unrelated to the 
envelope sender address, and there's nothing in your proposal, or any 
similar proposal, that could successfully keep clever people from 
doing this sort of stuff anyway.

	Of course, keep in mind that recent viruses have used legitimate 
local e-mail addresses to send copies of themselves to people in that 
person's address book.  You certainly shouldn't be able to prevent 
him from being able to use "From: bortzmeyer at nic.fr" when it's his 
own machine sending mail from his own MUA, assuming he were 
vulnerable to this sort of thing.

-- 
Brad Knowles, <brad.knowles at skynet.be>

"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety."
     -Benjamin Franklin, Historical Review of Pennsylvania.

GCS/IT d+(-) s:+(++)>: a C++(+++)$ UMBSHI++++$ P+>++ L+ !E-(---) W+++(--) N+
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tv+(+++) b+(++++) DI+(++++) D+(++) G+(++++) e++>++++ h--- r---(+++)* z(+++)