Re: [exim] Anti Phishing Trick

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Autor: Richard Clayton
Datum: 2005-08-24 16:12 -000
To: Marilyn Davis
CC: exim-users, Nigel Metheringham
Betreff: Re: [exim] Anti Phishing Trick
In message <Pine.LNX.4.44.0508240852090.32642-100000@Kuna>, Marilyn
Davis <marilyn@???> writes

>A forwarded message does not have the local_part@domain of the
>recipient on the To: header.


nor does email with the local_part@domain recorded in the Cc: header
field, the (perhaps imaginary) Bcc: header field or one of those exotic
Resent-* header fields that everyone forgets about first time around

> This is a clue for getting some value
>out of SPF.


that's what Microsoft thought when they invented the Purported
Responsible Address. Be careful not to reinvent their intellectual
property (or indeed to believe that it will get you a long way)

there's lots of resources out there about this stuff... it hasn't taken
over the world because it has problems :( If you're sure you can fix
those problems then this isn't the place to publish those fixes :(

- -- 
richard                                              Richard Clayton


They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety.         Benjamin Franklin