--On Monday, May 10, 2004 11:52 am -0400 Brian <bcook-exim@???>
wrote:
> Hello all,
>
> How do I deal with these lovely people?
>
> 2004-05-10 08:31:17 H=carmine.bestweb.net [209.94.102.73] sender verify
> fail for <mmackey@???>: response to "MAIL FROM:<>" from
> mail.ccsnys.org [208.234.30.80] was: 501 bogus mail from
Make sure that the mail that you rejected was legitimate - came from their
server. If it did, then copy all your correspondence with their postmaster
to the sender and intended recipient.
I use this text as my first report, feel free to use it. I'd love to be
able to add some examples or counts of institutions that use sender verify.:
We rejected a message, apparently from your server, yesterday because we
were unable to verify an email address from the server.
We use a sender verification callback to help us identify forged email
addresses. For this to work, your mailer MUST be configured to accept email
from the NULL sender.
This is also a requirement of the SMTP RFCs, as explained here:
<
http://www.rfc-ignorant.org/policy-dsn.php>
Furthermore, your while your mailer remains misconfigured, your users can't:
- get undelivered message bounces,
- get automatic vacation messages,
- get receipt verification messages.
All of these should be sent with a null return path to prevent
establishment of mail loops.
And, they can't send mail to:
- ??????????????????? email addresses,
- domains that do sender verification callbacks (an increasing number,
since it is a very good way of rejecting spam),
- domains that subscribe to the blacklist at the rfc-ignorant site.
You can, of course, reach me at postmaster@??????????, since the RFC's
forbid us from rejecting any mail addressed there.
> Trying 208.234.30.80...
> Connected to mail.ccsnys.org.
> Escape character is '^]'.
> 220 imail03.nt.aitcom.net (IMail 8.05 5186-15) NT-ESMTP Server X1
> helo blah.com
> 250 hello imail03.nt.aitcom.net
> mail from:<>
> 501 bogus mail from
>
>
> *sigh*..
>
> So how do I deal with this..
>
> - Thank in advance.
>
> - Brian
>
> require verify = sender/callout=use_sender,15s
> is what I'm using..
>
>
> --
>
>## List details at http://www.exim.org/mailman/listinfo/exim-users Exim
>## details at http://www.exim.org/ ##
>
--
Ian Eiloart
Servers Team
Sussex University ITS
