[Exim] Checking sender address

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Lähettäjä: David Saez Padros
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Vastaanottaja: exim-users
Aihe: [Exim] Checking sender address
Hi !!

Recently I received a email whith this headers:

From: rar@???
Reply-To: yuke@???
To: rar@???

where rar@??? is a local alias, How could I forbid anybody that has
not been authenticated to use local/virtual alias/email as From: , =

Reply-To, ... ?

I also received some spam using non-existant local adresses on the From:
it's possible to check the sender against this ?

--
Thanx & best regards ...

Alzheimers advantage: New friends every day.

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     David Saez Padros                  e-mail  david@???
     On-Line Services 2000 S.L.         =


     Trafalgar 78 2=BA 2=AA B               voice   +34 93 315 15 93
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     http://www.ols.es                  fax     +34 93 268 35 90
     http://www.ols.es/~david/   =


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