On Friday, September 19, 2003 3:40 PM [GMT+0800=SGT], Tarun Upadhyay <[EMAIL PROTECTED]> wrote:
> Yes, > I know lot of people do the same. This has been a convention in > Sendmail world for long. > However : > A) how does it help prevent spam (I can very well send you mail > faking [EMAIL PROTECTED])? In fact, most spammers not just > uses a legitimate domain name, they even exploit the open > proxies to fake as if the mail is coming from that domain. To > me it looks like a needless overhead for your smtp server. I had about 10% fall in total traffic by turning sender-domain verification on. Another 25% falls when I turn on callbacks. YMMV > B) why do you check for "A" records? Why is just checking for > "MX" records not enough? (if we expect that somehow > "legitimizes" the user. Because the RFC allows the absence of MX records for mail servers. For smaller domains, this makes sense. -- Sanjeev _______________________________________________ ilugd mailing list [EMAIL PROTECTED] http://frodo.hserus.net/mailman/listinfo/ilugd
