From adress must match the smtp clients DNS domain

[Jari Fredriksson]

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Gerhard Rappenecker kirjoitti 16.6.2016 15:18:
> Hi all,
> 
> I want to reject mails from some smtp clients specified by IP or
> subnet, if the from address don't match the clients DNS Domain.
> Can anyone help me?
> 
> My environment:
> postfix 2.11.6
> amavisd-new-2.8.1
> 
> I allready posted this message yesterday but it seems something went wrong
> 
> Regards
> Gerhard

You might want to take a look on mail security solutions like DKIM, SPF
and DMARC. These are de facto standards for this kind of stuff, and all
can be implemented into Postfix with FOSS components.

- -- 
jarif at iki.fi
https://www.bitwell.biz - cost effective hosting and security for
ecommerce
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