Author: David Woodhouse Date: To: Marc Perkel CC: exim-users Subject: Re: [exim] CSA - Do I want it?
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.
