Re: Hijacked email address.

On Thu, Apr 17, 2008 at 01:31:49PM -0400, Ugo Bellavance wrote:
There is NO way to prevent people from forging your name to the From: line
on an e-mail message.

False.

No, it's true. There is no way to prevent people from forging the From:
header.

SPF can help. DomainKeys can help.

These things help detect forgeries after the fact, but they don't do
anything to prevent forgeries in the From: line. They aren't designed for
that purpose.

Some other mechanisms like
watermarking in MailScanner, and there is also something called EMEW in
BarricadeMX (http://www.fsl.com/barricademx.html). There might be other
means, I only know those.

For SPF and DomainKeys, it depends on the proportion of mail servers
that check them.

For the 2 others, it assumes that all of your outgoing mail is going
through the MailScanner/BarricadeMX system(s)

A forged email can come from any server in the world.

Best Regards
Kent

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