Re: [vps-mail] reject=553 5.1.8 - Domain of sender address does not exist

[Bennett Lanford <benlanford@xxxxxxxxx>]

On 9/9/05, Andrew Brosnan <andrew@xxxxxxxxxxx> wrote:
> 
> Hello,
> 
> Some email sent to my VPS is bouncing with the following showing up in
> the maillog:
> 
> Sep 9 07:22:30 broscom sm-mta[13479]: j897MUZA013479:
> ruleset=check_mail, arg1=<root@xxxxxxxxxxxxxxxxxxxxxx>, relay=[clients
> IP number], reject=553 5.1.8 <root@xxxxxxxxxxxxxxxxxxxxxx>... Domain of
> sender address root@xxxxxxxxxxxxxxxxxxxxxx does not exist
> Sep 9 07:22:31 broscom sm-mta[13479]: j897MUZA013479:
> from=<root@xxxxxxxxxxxxxxxxxxxxxx>, size=8558, class=0, nrcpts=0,
> proto=ESMTP, daemon=MTA, relay=[clients IP number]
> 
> While myclientsdomain.com <http://myclientsdomain.com> exists, the 
> hostname 'db' is from one of the
> machines on their network and is behind a firewall.
> 
> Could anyone clue me in to why this is bouncing 


You identified the reason above (the sender's domain is unresolvable). 

and what I need to do in
> order to receive the mail?


You could insert the following FEATURE line in your sendmail macro 
configuration file and then generate a new sendmail.cf <http://sendmail.cf>:

FEATURE(`accept_unresolvable_domains')

(Standard warnings: note the two different kinds of quote marks, etc., etc.)

-- 
Bennett Lanford <benlanford@xxxxxxxxx>

There are 10 kinds of people: those that understand binary and those that 
don't.