[prev in list] [next in list] [prev in thread] [next in thread] 

List:       postfix-users
Subject:    Re: Change status code for "Host not found"
From:       Wietse Venema <wietse () porcupine ! org>
Date:       2019-09-16 13:58:28
Message-ID: 46X7BD0Y3dzJrNt () spike ! porcupine ! org
[Download RAW message or body]

Wietse Venema:
> Helmut Schneider:
> [ Charset ISO-8859-1 converted... ]
> > Hi,
> > 
> > I'm running postfix as a relay connected via VPN. If the VPN is down
> > mails are rejected:
> > 
> > relay=none, delay=0.09, delays=0.06/0.02/0.01/0, dsn=5.4.4,
> > status=bounced (Host or domain name not found. Name service error for
> > name=EXCHANGE01 type=AAAA: Host not found)
> 
> It's status=bounced (dsn=5.4.4) because Postfix received a DNS
> NXDOMAIN (name does not exist) response for the name 'EXCHANGE01'.
> 
> > Is there a way to change the dsn to 4xx and deliver it when the VPN is
> > up again?
> 
> http://www.postfix.org/postconf.5.html#default_delivery_status_filter
> Look under the examples for smtp_delivery_status_filter. Here is
> an untested variant that should work.
> 
> /etc/postfix/main.cf:
>    smtp_delivery_status_filter = pcre:/etc/postfix/smtp_dsn_filter
> 
> /etc/postfix/smtp_dsn_filter:
>     /^5(\.\d+\.\d+ Name service error for name=EXCHANGE01/ 4$1

Should be:

    /^5(\.\d+\.\d+ Name service error for name=EXCHANGE01)/ 4$1

(i.e. there was no closing ')').

	Wietse
> You can't use http://www.postfix.org/postconf.5.html#smtp_dns_reply_filter
> because that feature requires that the server returns a reply, not
> NXDOMAIN.
> 
> 	Wietse
> 
[prev in list] [next in list] [prev in thread] [next in thread]