spam.whitelist.rules and domain of sender does not exist

[Julian Field]

At 19:03 03/01/2003, you wrote:
>Thanks for the response, I removed dnl from the line referenced below and
>rebuilt the sendmail.cf and it is working now.  I am curious to know if
>anyone is aware of any security issues involved in allowing unresolvable
>domains to send mail?   What is the preferred setting for most people?

Most people (AFAIK) don't allow messages from unresolvable domains as a
mild anti-spam measure, as spammers used to use fake domain names. Anyone
else got better reasons than that? It comes partly from the fact that if
the domain name cannot be resolved, then you will never be able to deliver
directly to the domain anyway, so why bother accepting the message at all?


>Thanks again for the response.
>
>  Mike Kercher <mike at CAMAROSS.NET> wrote:
>Domain of sender error message is coming from sendmail and not MailScanner.
>
>Take a look at your /etc/mail/sendmail.mc and look for this line:
>
>dnl FEATURE(`accept_unresolvable_domains')dnl
>
>Remove the leading 'dnl' and rebuild your sendmail.cf and see if that helps.
>
>Mike
>
>
>-----Original Message-----
>From: MailScanner mailing list [mailto:MAILSCANNER at JISCMAIL.AC.UK] On Behalf
>Of lester lasad
>Sent: Thursday, January 02, 2003 2:54 PM
>To: MAILSCANNER at JISCMAIL.AC.UK
>Subject: spam.whitelist.rules and domain of sender does not exist
>
>
>
>I am running MailScanner 4.10-1 on RedHat 7.3 and would like to allow email
>from a non-existent domain to be delivered. There are several reports that
>are generated in our internal network that are delivered via SMTP ( thru
>MailScanner ) and the email is not going thru because the sender does n! ot
>exist.
>
>I have tried adding both and the ip address and the sender to the
>spam.whitelist.rules file but it continues to deny the emails. Has anyone
>run into this or is there a solution for this problem? I have stopped and
>restarted MailScanner "service MailScanner stop" and "service MailScanner
>start" after making the changes. I have also tried "service MailScanner
>restart". I have added the following line to spam.whitelist.rules
>
>From: invalidsender at abc.com yes
>
>From: 10.2.1.1 yes
>
>
>
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--
Julian Field
www.MailScanner.info
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