Stop the "Undelivered Mail Returned to Sender"

[Aleksandar Milivojevic]

Quoting Jason Sopko <jason at sopko.net>:

> Benjamin Adams wrote:
>> I get a lot of mail spoofing is here anyway I can stop this?
>> Or see if make is really coming from my mail server?
>
> This is off-topic, but you might want to take a look at Sender Policy 
> Framework (SPF) at http://www.openspf.org - it's meant to stop people 
> from sending you email by forging the 'from:' header using your own 
> domain.

And also to break mail forwarding/aliasing in the process.  There are 
some very good reasons why MTA developers (well, at least sendmail and 
postfix developers) rejected SPF patches and are openly advocating 
against the use of SPF.

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