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Bug 540616 - smtp.gentoo.org has an IPv6 address, but lacks RDNS entry for it
Summary: smtp.gentoo.org has an IPv6 address, but lacks RDNS entry for it
Status: RESOLVED FIXED
Alias: None
Product: Gentoo Infrastructure
Classification: Unclassified
Component: Other (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Gentoo Infrastructure
URL:
Whiteboard:
Keywords:
: 540654 (view as bug list)
Depends on:
Blocks:
 
Reported: 2015-02-19 07:21 UTC by René 'Necoro' Neumann
Modified: 2015-03-02 23:35 UTC (History)
1 user (show)

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Package list:
Runtime testing required: ---

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Description René 'Necoro' Neumann 2015-02-19 07:21:48 UTC 
smtp.gentoo.org now seems to be capable of using IPv6. Unfortunately, for IPv6 it does not yet have an RDNS entry. Therefore mail servers (mine for instance) refuse to accept mail from it and it has to retry using IPv4:

Feb 18 21:15:17 [postfix/smtpd] NOQUEUE: reject: RCPT from unknown[2001:470:ea4a:1:5054:ff:fec7:86e4]: 450 4.7.1 Client host rejected: cannot find your reverse hostname, [2001:470:ea4a:1:5054:ff:fec7:86e4]; from=<double-bounce@gentoo.org> to=<me@host.example> proto=ESMTP helo=<smtp.gentoo.org>

Feb 18 21:37:09 [postfix/smtpd] NOQUEUE: reject: RCPT from unknown[2001:470:ea4a:1:5054:ff:fec7:86e4]: 450 4.7.1 Client host rejected: cannot find your reverse hostname, [2001:470:ea4a:1:5054:ff:fec7:86e4]; from=<bugzilla-daemon@gentoo.org> to=<me@host.example> proto=ESMTP helo=<smtp.gentoo.org>

Solution: Install a reverse DNS entry for 2001:470:ea4a:1:5054:ff:fec7:86e4, so that mail servers don't think, smtp.gentoo.org is a spam bot :)
Comment 1 Alex Legler (RETIRED) archtester gentoo-dev Security 2015-02-19 12:36:04 UTC 
*** Bug 540654 has been marked as a duplicate of this bug. ***
Comment 2 Conrad Kostecki gentoo-dev 2015-02-27 10:15:45 UTC 
Any news on this?
Comment 3 Alex Legler (RETIRED) archtester gentoo-dev Security 2015-03-02 23:35:21 UTC 
% nslookup '2001:470:ea4a:1:5054:ff:fec7:86e4'
Server:		192.168.1.1
Address:	192.168.1.1#53

Non-authoritative answer:
4.e.6.8.7.c.e.f.f.f.0.0.4.5.0.5.1.0.0.0.a.4.a.e.0.7.4.0.1.0.0.2.ip6.arpa	name = mail.gentoo.org.
4.e.6.8.7.c.e.f.f.f.0.0.4.5.0.5.1.0.0.0.a.4.a.e.0.7.4.0.1.0.0.2.ip6.arpa	name = woodpecker.gentoo.org.
4.e.6.8.7.c.e.f.f.f.0.0.4.5.0.5.1.0.0.0.a.4.a.e.0.7.4.0.1.0.0.2.ip6.arpa	name = dev.gentoo.org.

Should be fixed now.