email being rejjjcted fro unknown domains

[Stephen Swaney]

> -----Original Message-----
> From: MailScanner mailing list [mailto:MAILSCANNER at JISCMAIL.AC.UK] On
> Behalf Of Lance Haig
> Sent: Monday, November 07, 2005 4:20 PM
> To: MAILSCANNER at JISCMAIL.AC.UK
> Subject: email being rejjjcted fro unknown domains
> 
> Hi,
> 
> me again ;-)
> 
> I have just setup  my new MS box ( replacing the one I had under my desk
> at home with one in a hosted facility)
> 
> I have set one of my test domains to point to the new IP and when I send
> mail I get the following error.
> 
> reject=553 5.1.8 <Lance.Haig at domain.com>... Domain of sender address
> Lance.Haig at domain.com does not exist.
> 
> Where is MS checking this? I know he address exists that I am sending
> from as it is my work address and we do not get mail stopped by other
> scanners.
> 
> have I enabled something that is killing mail like this?
> 
> I would appreciate any help.
> 
> Thanks
> 
> Lance

This is normal. You should see some lines like the ones below in you
sendmail ".mc" file:

dnl # We strongly recommend not accepting unresolvable domains if you want 
dnl # to protect yourself from spam. However, the laptop and users on
computers
dnl # that do not have 24x7 DNS do need this.
dnl #
FEATURE(`accept_unresolvable_domains')dnl

But this is the typical configuration on most gateways and you probably do
to want to accept email from un-resolvable domains. If you really want to
turn this off change the line to:

dnl FEATURE(`accept_unresolvable_domains')dnl

And use m4 to rebuild your .cf from the .mc file. Then restart sendmail.

Steve

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

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