The thought-work was already done for you. As Oded said, read about
Sender Policy Framework (SPF). Using a mail server with SPF is about all
you can do; it ain't good news, but trust the smart people who thought
SPF up there isn't a better option.
Elazar Leibovich wrote:
That's very true, I haven't thought of that. Thanks.
Any smarter idea? Maybe I can filter emails coming from my host email
address and then make sure they're not recieved: from unknown source
(spammers has the habbit of including your hostname in the from:
field, so that you'll whitelist them)
On 6/19/06, Ehud Karni <[EMAIL PROTECTED]> wrote:
On Mon, 19 Jun 2006 04:44:25 -0700 (PDT), E Leibovich wrote:
>
> Is there any automated tool to bounce email not from
> the original server? That is, is there a tool that
> bounces back emails claiming they're from hostA (their
> from:[EMAIL PROTECTED]) however they're really from hostB
> (that is, recieved: from hostB...).
> This seems a good way to prevent many spam messages
> that claim to originate from your server.
> Is it a good idea?
> Is there any written script that does so?
This is NOT a good way. Many mailing lists and other sources (e.g.
small offices sending their mail through their ISP) will bounce.
Even your email - from: <[EMAIL PROTECTED]> - had come from
[EMAIL PROTECTED] Remember - all the headers (except
the last "Received:", created by your computer) may be forged.
Ehud.
--
Ehud Karni Tel: +972-3-7966-561 /"\
Mivtach - Simon Fax: +972-3-7966-667 \ / ASCII Ribbon Campaign
Insurance agencies (USA) voice mail and X Against HTML Mail
http://www.mvs.co.il FAX: 1-815-5509341 / \
GnuPG: 98EA398D <http://www.keyserver.net/> Better Safe Than Sorry
=================================================================
To unsubscribe, send mail to [EMAIL PROTECTED] with
the word "unsubscribe" in the message body, e.g., run the command
echo unsubscribe | mail [EMAIL PROTECTED]
=================================================================
To unsubscribe, send mail to [EMAIL PROTECTED] with
the word "unsubscribe" in the message body, e.g., run the command
echo unsubscribe | mail [EMAIL PROTECTED]
