Re: [Exim] RFC: Fighting Spam due to forgeries of outblaze …

On 19 Feb 2004 at 17:55, Anand Buddhdev wrote about

    "Re: [Exim] RFC:  Fighting Spam due ":

| On Thu, Feb 19, 2004 at 10:05:34PM +0530, Suresh Ramasubramanian wrote:
|...
| > Don't hardcode our IPs. If we renumber out of these or something you are
| > left with a stale ACL.
| >
| > Whatever we have will have rDNS in the outblaze.com domain
|
| A spammer who controls their own rDNS will then be able bypass the
| ACL.

Not if you also check that the PTR name looks up to the same IP.

- Fred