| Main Archive Page > Month Archives > postfix-users archives |
Re: Emails from IPv6 addresses are blocked by DNSBLs
From: Alvin Wong <alvinhochun_at_nospam>Date: Sun Jun 17 2012 - 01:31:32 GMT
To: Postfix users <postfix-users@postfix.org>
Hi,
What if you put bl.spamcop.net below other blocklsts?
P.S. zen.spamhaus.org includes xbl.spamhaus.org, which includes
cbl.abuseat.org, so you don't actually need cbl.abuseat.org as another
entry.
2012/6/17 Wietse Venema <wietse@porcupine.org>:
> Thomas Preissler:
>> Hello,
>>
>> I have now for some time Postfix listening on IPv6 on my server.
>> When I send for example emails to bouncer@freenet6.net or
>> ipv6@test-ipv6.veznat.com I receive them via IPv6, all is good.
>> I also (very rarely though) receive "normal" emails via IPv6. So far so
>> good.
>>
>> Basically when more and more email servers got IPv6 enabled, I sometimes
>> saw
>>
>> Jun 14 19:20:02 dumbledor postfix/smtpd[1472]: NOQUEUE: reject: RCPT
>> from unknown[2002:XXXX:XXX::XXXX:XXX]: 554 5.7.1 Service unavailable;
>> Client host [2002:XXXX:XXX::4d49:4f1] blocked using bl.spamcop.net;
>> from=<XXXXXXXXXXXXXXXXXXXXXXXXXXXX> to=<thomas@preissler.co.uk>
>> proto=ESMTP helo=<XXXXXXXXXXXXXXXXXXXXXXXXX>
>>
>> Long story short:
>> * Some IPv6 addreses are DNSBL blocked, some or not. When they are
>> Â blocked, they stay blocked and same for when they are not blocked
>> Â (like the test IPv6 emailaddresses above).
>> * They always get blocked by the first DNSBL entry - obviously.
>> * Querying the DNSBL via their webinterface doesnt work for IPv6
>> Â addresses, doing the same via the equivalent nslookup or dig command
>> Â gives me NXDOMAIN.
>> * No IPv6 firewall enabled, but I run a local only bind.
>>
>> Did anybody experience the same?
>> The odd thing is, and I cannot get my head around that, is that it works
>> for some, for others it never worked.
>
> What is the IP address?
>
> What NSLOOKUP query did you use?
>
> Â Â Â Â Wietse