Quoting Wayne Pascoe:

>> (http://www.exim.org/eximwiki/FAQ/Policy_controls/Q0730).
> I think I'm being thick, but I can't really see the major difference 
> between what is in the Wiki and what Juha posted. Could someone please 
> enlighten me?

Actually, Juha's version is also in the Wiki 
(http://www.exim.org/eximwiki/AuthenticatedSmtpUsingCourier).

The difference is: The simple version (without ${extract...}) relies on 
authdaemon returning FAIL to _deny_ access, while the other one expects 
"address=something" to _allow_ access, which is the better approach from 
security point of view, I'd say. This might be nitpicking, but better 
safe than sorry.


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