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.
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.
Does not look like a way to me avoid any significant spam. Just creating
more DNS queries.
With Warm Regards
Tarun Upadhyay
Induslogic Inc.
*Industrial Strength Software*
4th Floor, Picadilly House
276, Capt Gaur Marg, Srinivaspuri
Delhi 110065, India.
P: +91.11.5170.9070 x 5353
F: +91.11.5170.9071
C: +91.9811.535353
E: [EMAIL PROTECTED]
www.induslogic.com
> -----Original Message-----
> From:
> [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]
> i.org] On Behalf Of Sanjeev "Ghane" Gupta
> Sent: Friday, September 19, 2003 12:55 PM
> To: 'The Linux-Delhi mailing list'
> Subject: Re: [ilugd] Verisign Plays the M$ way
>
> On Friday, September 19, 2003 3:17 PM [GMT+0800=SGT], Tarun
> Upadhyay <[EMAIL PROTECTED]> wrote:
>
> > Can somebody more knowledgeable enlighten me on what kind
> of things I
> > can expect to break because of this from a system
> administration point
> > of view and how can they be repaired.
> > (just the facts please, not the rhetoric).
>
> On my servers, I do sender verification. When I see the MAIL
> FROM, I check if the right-hand-side is deliverable, so it
> must have either:
> An MX record
> An A record
>
> As such, I do not accept (spam?) from [EMAIL PROTECTED]
>
> With this change, nosuchdoamin.com will seem to exist.
>
> The rest is left as an exercise to the reader ;-)
>
> --
> Sanjeev
>
>
>
> _______________________________________________
> ilugd mailing list
> [EMAIL PROTECTED]
> http://frodo.hserus.net/mailman/listinfo/ilugd
>
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