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Voytek Eymont

2011-May-02 11:30 UTC

[Dovecot] is reverse dns down ?

Hi guys, is that a genuine email from the list, I'm getting it rejected as
it's missing reverse hostname:

May  2 21:21:41 postfix/smtpd[18033]: NOQUEUE: reject: RCPT from
unknown[194.89.34.45]: 450 4.7.1 Client host rejected: cannot find your
reverse hostname, [194.89.34.45]; from=<dovecot-bounces at dovecot.org>
to=<voytek at sbt.net.au> proto=ESMTP helo=<mkentta.iki.fi>

# host mkentta.iki.fi
mkentta.iki.fi has address 194.89.34.45
mkentta.iki.fi mail is handled by 10 mkentta.iki.fi.
mkentta.iki.fi mail is handled by 100 smtp.menturagroup.com.

# host  194.89.34.45
Host 45.34.89.194.in-addr.arpa. not found: 3(NXDOMAIN)




-- 
Voytek

Esther Yébenes --Conzentra--

2011-May-02 11:42 UTC

head link

[Dovecot] is reverse dns down ?

Hi Voytek,

I am not having any problem:

# host mkentta.iki.fi
mkentta.iki.fi has address 194.89.34.45
mkentta.iki.fi mail is handled by 100 smtp.menturagroup.com.
mkentta.iki.fi mail is handled by 10 mkentta.iki.fi.

# host  194.89.34.45
45.34.89.194.in-addr.arpa domain name pointer mkentta.iki.fi.


Maybe it's a local problem with your NS server.




On 02/05/11 13:30, Voytek Eymont wrote:> Hi guys, is that a genuine email from the list, I'm getting it rejected
as
> it's missing reverse hostname:
>
> May  2 21:21:41 postfix/smtpd[18033]: NOQUEUE: reject: RCPT from
> unknown[194.89.34.45]: 450 4.7.1 Client host rejected: cannot find your
> reverse hostname, [194.89.34.45]; from=<dovecot-bounces at
dovecot.org>
> to=<voytek at sbt.net.au>  proto=ESMTP helo=<mkentta.iki.fi>
>
> # host mkentta.iki.fi
> mkentta.iki.fi has address 194.89.34.45
> mkentta.iki.fi mail is handled by 10 mkentta.iki.fi.
> mkentta.iki.fi mail is handled by 100 smtp.menturagroup.com.
>
> # host  194.89.34.45
> Host 45.34.89.194.in-addr.arpa. not found: 3(NXDOMAIN)
>
>
>
>
>    

-- 

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Tel. +34 93 412 3750. Ext. 306
Fax. +34 902 889 440
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Stan Hoeppner

2011-May-02 12:05 UTC

head link

[Dovecot] is reverse dns down ?

On 5/2/2011 6:30 AM, Voytek Eymont wrote:
> # host  194.89.34.45
> Host 45.34.89.194.in-addr.arpa. not found: 3(NXDOMAIN)
~$ host 194.89.34.45
45.34.89.194.in-addr.arpa domain name pointer mkentta.iki.fi.

~$ prdns.pl 194.89.34.45/32
194.89.34.45: mkentta.iki.fi

~$ rdns-tool.pl 194.89.34.45/32
using mask 32
    194.89.34.45: mkentta.iki.fi

Looks like there's a DNS issue on your end.  Try flushing your cache. 
For obvious reasons Postfix returns a 450 in this case, so the list 
server will attempt delivery for a few days.

If you don't run your own resolver on your Postfix MX I suggest you do 
so.  I use PowerDNS recursor on my MX MTAs.  Works great.  Setup takes 
less than 5 minutes.  Caching is in memory only, not disk, so a restart 
clears everything.

-- 
Stan

/dev/rob0

2011-May-02 15:32 UTC

head link

[Dovecot] is reverse dns down ?

On Mon, May 02, 2011 at 10:30:44PM +1100, Voytek Eymont
wrote:> Hi guys, is that a genuine email from the list, I'm getting it 
> rejected as it's missing reverse hostname:
> 
> May 2 21:21:41 postfix/smtpd[18033]: NOQUEUE: reject: RCPT
> from unknown[194.89.34.45]: 450 4.7.1 Client host rejected:
> cannot find your reverse hostname, [194.89.34.45]; 
> from=<dovecot-bounces at dovecot.org> to=<voytek at sbt.net.au>
> proto=ESMTP helo=<mkentta.iki.fi>
> 
> # host mkentta.iki.fi
> mkentta.iki.fi has address 194.89.34.45
> mkentta.iki.fi mail is handled by 10 mkentta.iki.fi.
> mkentta.iki.fi mail is handled by 100 smtp.menturagroup.com.
> 
> # host  194.89.34.45
> Host 45.34.89.194.in-addr.arpa. not found: 3(NXDOMAIN)
We discussed this the other day under Timo's thread about 
dovecot.org. It seems that ns.ripe.net., one of the NS hosts for 
89.194.in-addr.arpa., is not returning the PTR for 
45.34.89.194.in-addr.arpa. AFAICS the other NS hosts seem to be 
working fine, but if your resolver was unlucky enough to hit 
ns.ripe.net., you have a host with no PTR.

It's like Russian roulette with rDNS. I suspect it might be a 
casualty of DNSSEC, but I get the same "noerror" response when
querying with +dnssec and +nodnssec.

At this point those who use the normally safe and reasonable 
reject_unknown_reverse_client_hostname restriction should consider 
whitelisting mkentta.iki.fi[194.89.34.45] in the MTA.

And Timo needs to scream louder at the ISP. ;)
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