RDNS

[Rose, Bobby]

>From the http://www.sendmail.org/tips/relaying.html

FEATURE(accept_unresolvable_domains). Normally, sendmail will refuse to
accept mail that has a return address with a domain that cannot be
resolved using the regular host lookups (a technique commonly used by
spammers). This feature permits acceptance of such addresses.
Unresolvable domains can be selectively accepted using the access
database.  

-----Original Message-----
From: mailscanner-bounces at lists.mailscanner.info
[mailto:mailscanner-bounces at lists.mailscanner.info] On Behalf Of Stephen
Swaney
Sent: Monday, January 23, 2006 6:33 PM
To: 'MailScanner discussion'
Subject: RE: RDNS


> -----Original Message-----
> From: mailscanner-bounces at lists.mailscanner.info [mailto:mailscanner- 
> bounces at lists.mailscanner.info] On Behalf Of Rose, Bobby
> Sent: Monday, January 23, 2006 6:24 PM
> To: MailScanner discussion
> Cc: mailscanner-announce at lists.mailscanner.info
> Subject: RE: RDNS
> 
> I thought that it was a default action in sendmail to not accept from 
> unresolvable hosts and in setting 
> FEATURE(`accept_unresolvable_domains')dnl you are actually disabling 
> so that it does accept from unresolvable hosts.
> 

Nope :(

Steve

Stephen Swaney
Fort Systems Ltd.
stephen.swaney at fsl.com
www.fsl.com

> -----Original Message-----
> From: mailscanner-bounces at lists.mailscanner.info
> [mailto:mailscanner-bounces at lists.mailscanner.info] On Behalf Of Matt 
> Kettler
> Sent: Monday, January 23, 2006 5:42 PM
> To: MailScanner discussion
> Cc: mailscanner-announce at lists.mailscanner.info
> Subject: Re: RDNS
> 
> Darryl DeLao wrote:
> > Is there a way to turn on RDNS in Mailscanner, or is this done in 
> > Sendmail?  If so, how is it done?  Basically, if an email comes in 
> > and
> 
> > the originating domain can not be resolved, I do not want to accept 
> > the email in the system.
> 
> Well, MailScanner can't ever prevent any email from being accepted.
> MailScanner acts on the queue files, so by the time MS sees it, it's 
> long since been accepted.
> 
> 
> However, the feature you want is a standard sendmail feature. Look up 
> the "accept_unresolvable_domains" feature, and disable it.
> 
> If you're using m4 to build your sendmail.cf (highly recommended 
> unless you're a sendmail master)
> 
> edit /etc/mail/sendmail.mc
> 
> add a "dnl" to the start of the feature line, line this:
> 
> dnl FEATURE(`accept_unresolvable_domains')dnl
> 
> rebuild your sendmail.cf by running make in the /etc/mail directory
> 
> restart your MailScanner service to restart the sendmail's.
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