[ILUG] Reminder: Please Respond to S.'s Invitation
rick at linuxmafia.com
Thu Jan 15 10:43:05 GMT 2009
Quoting paul at clubi.ie (paul at clubi.ie):
> If SPF isn't to prevent spam, what's the point of it?
To permit MTAs and other software to detect SMTP envelope forgery -- as
stated with abundant clarity, pretty much everywhere covering this topic
(everywhere with technical clue, anyway, i.e., not in the general IT
press). DKIM, same thing.
> It's also useless at preventing joe-job back-scatter too....
Nothing can _prevent_ joe-job backscatter, unless you can track down the
spam-sending MTAs and pull their mains cords. However, you can create
the means to detect and reject them. That's DKIM and SPF. Well, also
Sender-ID (Microsoft's SPF variant), but that's poisoned by MSFT-owned
None of these envelope-validating techniques excludes the others.
Cheers, Crypto lets someone say "Hi! I absolutely definitely have
Rick Moen a name somewhat like the name of a large familiar
rick at linuxmafia.com organization, and I'd like to steal your data!" and lots
McQ! (4x80) of users will say "OK, fine, whatever." -- John Levine
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