Avoiding "Domain not found" errors

[N. Yaakov Ziskind]

A particular mailer, slightly broken, cannot send mail to a postfix
(2.7.0) box:

Feb 5 08:51:16 pizza postfix/smtpd[30453]: NOQUEUE: reject: RCPT from
chocolate .egps.com[38.119.130.7]: 450 4.1.8
<nob...@vps.jewishwomansonlinecalendar.com>: Sender address rejected: i
Domain not found; from=<nob...@vps.jewishwomansonlinecalendar.com>
to=<sam...@domain.example> proto=ESMTP helo=<chocolate.egps.com>

Where the sam...@domain.example is a valid address on the local machine.

What's the easiest to let this mail through? I tried adding the domain
to /var/spool/postfix/etc/hosts, and it didn't help.

Thanks!

[DN Singh]

The setting can be changed in the parameter "smtpd_sender_restrictions" reject_unknown_sender_domain, if it is necessary.

Postfix looks up the the domain, and if it does not find any info, it rejects the mail.
Anyways, the domain in the mail is indeed non-existent.

[N. Yaakov Ziskind]

DN Singh wrote (on Wed, Feb 08, 2012 at 10:50:50AM +0530):
> The setting can be changed in the parameter "smtpd_sender_restrictions"
> reject_unknown_sender_domain, if it is necessary.

That would let in *all* mail from nonexistent domains, which I was
hoping to avoid.

> Postfix looks up the the domain, and if it does not find any info, it
> rejects the mail.
> Anyways, the domain in the mail is indeed non-existent.

But it's a subdomain of a valid domain, and it's a useful email ..
What's the easiest way to let this email from this one sender through?

[Reindl Harald]

Am 08.02.2012 07:06, schrieb N. Yaakov Ziskind:
> DN Singh wrote (on Wed, Feb 08, 2012 at 10:50:50AM +0530):
>> The setting can be changed in the parameter "smtpd_sender_restrictions"
>> reject_unknown_sender_domain, if it is necessary.
>
> That would let in *all* mail from nonexistent domains, which I was
> hoping to avoid.

so what do you want?
let them in or reject them

>> Postfix looks up the the domain, and if it does not find any info, it
>> rejects the mail.
>> Anyways, the domain in the mail is indeed non-existent.
>
> But it's a subdomain of a valid domain, and it's a useful email ..
> What's the easiest way to let this email from this one sender through?

fix the dns of the sending domain
postfix is not interested in the "main-domain" as most software is not

you can simply no decide what is the main domain

"yourdomain.at"
"yourdomain.co.at"

with your logic you would let in all from ".co.at"?
have fun with that!

[/dev/rob0]

On Wed, Feb 08, 2012 at 01:06:44AM -0500, N. Yaakov Ziskind wrote:
> DN Singh wrote (on Wed, Feb 08, 2012 at 10:50:50AM +0530):
> > The setting can be changed in the parameter
> > "smtpd_sender_restrictions" reject_unknown_sender_domain,
> > if it is necessary.
>
> That would let in *all* mail from nonexistent domains, which
> I was hoping to avoid.
>

> > Postfix looks up the the domain, and if it does not find
> > any info, it rejects the mail.
> > Anyways, the domain in the mail is indeed non-existent.
>
> But it's a subdomain of a valid domain, and it's a useful
> email .. What's the easiest way to let this email from this
> one sender through?

DN Singh was guessing about smtpd_sender_restrictions, but indeed
this is a case when you would need another restriction stage. If
your reject_unknown_sender_domain check was being done in
smtpd_recipient_restrictions, move it to smtpd_sender_restrictions.
Remove it from all other restriction stages.

Precede that check with a check_client_access lookup:
38.119.130.7 OK
or, less safe, a check_sender_access lookup:
vps.jewishwomansonlinecalendar.com OK

Salt to taste, enjoy.

> > On Wed, Feb 8, 2012 at 9:45 AM, N. Yaakov Ziskind
> > <aw...@ziskind.us> wrote:
> >
> > > A particular mailer, slightly broken, cannot send mail to a
> > > postfix (2.7.0) box:
> > >
> > > Feb 5 08:51:16 pizza postfix/smtpd[30453]: NOQUEUE: reject:

> > > RCPT from chocolate.egps.com[38.119.130.7]: 450 4.1.8

> > > <nob...@vps.jewishwomansonlinecalendar.com>: Sender address
> > > rejected: i Domain not found;
> > > from=<nob...@vps.jewishwomansonlinecalendar.com>
> > > to=<sam...@domain.example> proto=ESMTP
> > > helo=<chocolate.egps.com>
> > >
> > > Where the sam...@domain.example is a valid address on the
> > > local machine.
> > >
> > > What's the easiest to let this mail through? I tried adding
> > > the domain to /var/spool/postfix/etc/hosts, and it didn't
> > > help.

http://www.postfix.org/SMTPD_ACCESS_README.html
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