Re: Problems with mail system? [Fwd: Returned mail: User unknown]
On Thu, Sep 07, 2000 at 12:33:21PM +0200, Marco d'Itri wrote:
> On Sep 07, Jason Gunthorpe <email@example.com> wrote:
> >This is just your standard lack of reverse DNS.. Part of the anti-spam
> >bit. The sender needs to get working reverse DNS I suppose..
> Looks like a stupid check, to me.
> Some very big ISP here have mailservers with no reverse mapping...
Well, they are badly broken, you know?
The IANA mandate is that /all/ machines on public IP address have
reverse mappings. No exceptions. I won't rehash the old debate over
whether it's better to tolerate broken behaviour (better resilience)
or force broken behaviour to break worse (often the only way to force
incompetent idiots to fix things).
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