> -----Original Message----- > From: > [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] > i.org] On Behalf Of Sanjeev "Ghane" Gupta > Sent: Friday, September 19, 2003 1:37 PM > To: The Linux-Delhi mailing list > Subject: Re: [ilugd] Verisign Plays the M$ way > > 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
Thanks for the info Sanjiv, Varun, Shuvam and Raj. This was educational. I did not know: A) RFC allows "A" records instead of MX. And, yes, it does make sense. B) about 10% of mail traffic is refused when sender domain verification is on. Thanks again. tarun _______________________________________________ ilugd mailing list [EMAIL PROTECTED] http://frodo.hserus.net/mailman/listinfo/ilugd
