RE: [exim] Exim server behind NAT router (and HELO)

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Autor: David Brodbeck
Datum:  
To: 'Exim User's Mailing List'
Betreff: RE: [exim] Exim server behind NAT router (and HELO)
> -----Original Message-----
> From: Greg A. Woods [mailto:woods@most.weird.com]


> >     'sides, ya can only have 1 reverse on an address, no?

>
> NO.
>
> Obviously not:
>
> $ host -i -a 204.92.254.2
> 2.254.92.204.in-addr.arpa       PTR     most.weird.com
> 2.254.92.204.in-addr.arpa       PTR     mail.weird.com
> 2.254.92.204.in-addr.arpa       PTR     most.robohack.planix.com
> 2.254.92.204.in-addr.arpa       PTR     mail.robohack.planix.com

>
>
> Why does this oh-so-bogus-and-busted myth persist?


Probably because most of the time, software only pays attention to the first
PTR entry returned, and ignores the rest. Also, a lot of ISPs probably
aren't aware that this can be set up, just like a lot of them aren't aware
that they can delegate blocks smaller than /24.