Re: [exim] CSA - Do I want it?

David Woodhouse wrote:
> On Sat, 2006-05-06 at 15:15 -0700, Marc Perkel wrote:
>
>> I ran across this CSA thing in the Exim manual. Do I want to use it?
>> If so - why? And does it break email forwarding like SPF does?
>>
>
> It allows you to reject bogus use of HELO. If nothing else, it's allowed
> me to drop the hacks in my config files which specifically check for
> _my_ machine's local hostname or one of my domain names being used in
> HELO. I haven't seen it reject much _other_ than that. Possibly because
> CSA records aren't particularly widespread.
>
> I also use it as a greylisting trigger, in conjuction with reverse DNS.
> If you have _neither_ reverse DNS nor a CSA record, you are likely to
> get greylisted. Those with crap ISPs who can't fix their reverse DNS can
> usually at least manage to set up CSA.
>
> It doesn't break forwarding.
>
Just for grins could you or someone post some sample CSA code. Maybe add it to the Wiki?

So the idea is that by publishing CSA information I'm telling the world what servers are allowed to say helo using my domain?