IPv6 only host will be rejected by resolve-helo-identif
Posted: Thu Jul 28, 2016 12:07 am
Hi,
we have discovered an issue with a german web hosting service provider, strato.
They have IPv6 only hostnames, what should not be a problem at all, but magicspam will reject this mail with:
full log
checking the DNS entries tells us, they have no A entry:
but an AAAA entry:
we have discovered an issue with a german web hosting service provider, strato.
They have IPv6 only hostnames, what should not be a problem at all, but magicspam will reject this mail with:
Code: Select all
HELO argument [mo6-p00-ob.smtp.rzone.de] is missing a DNS entry
Code: Select all
info@example.org
Letzter Fehler: 550 5.7.0
Erklärung: host mail.example.de [2a01:ff:fff:fff::2] said: HELO argument
[mo6-p00-ob.smtp.rzone.de] is missing a DNS entry. See
http://spamauditor.org/best-practices/resolve-helo-identif
ier/ for more information. Protection provided by
MagicSpam 2.0.5-1 http://www.magicspam.com
Auszug aus dem Session-Protokoll:
... während der Kommunikation mit dem Mailserver mail.example.de [2a01:ff:fff:fff::2]:
>>> RCPT TO:<info@example.org>
<<< 550 5.7.0 HELO argument [mo6-p00-ob.smtp.rzone.de] is missing a DNS
entry. See
http://spamauditor.org/best-practices/resolve-helo-identifier/
for more information. Protection provided by MagicSpam 2.0.5-1
http://www.magicspam.com
Code: Select all
dig A mo6-p00-ob.smtp.rzone.de
; <<>> DiG 9.8.3-P1 <<>> A mo6-p00-ob.smtp.rzone.de
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 39163
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;mo6-p00-ob.smtp.rzone.de. IN A
;; AUTHORITY SECTION:
rzone.de. 3600 IN SOA karlsruhe.nic.xlink.net. de-domain.xlink.net. 2016072800 86400 7200 604800 86400
;; Query time: 34 msec
;; SERVER: 172.17.3.1#53(172.17.3.1)
;; WHEN: Thu Jul 28 09:04:43 2016
;; MSG SIZE rcvd: 111
Code: Select all
dig AAAA mo6-p00-ob.smtp.rzone.de
;; Truncated, retrying in TCP mode.
; <<>> DiG 9.8.3-P1 <<>> AAAA mo6-p00-ob.smtp.rzone.de
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 26698
;; flags: qr rd ra; QUERY: 1, ANSWER: 12, AUTHORITY: 13, ADDITIONAL: 0
;; QUESTION SECTION:
;mo6-p00-ob.smtp.rzone.de. IN AAAA
;; ANSWER SECTION:
mo6-p00-ob.smtp.rzone.de. 86400 IN AAAA 2a01:238:20a:202:5300::7
mo6-p00-ob.smtp.rzone.de. 86400 IN AAAA 2a01:238:20a:202:5300::4
mo6-p00-ob.smtp.rzone.de. 86400 IN AAAA 2a01:238:20a:202:5300::8
mo6-p00-ob.smtp.rzone.de. 86400 IN AAAA 2a01:238:20a:202:5300::2
mo6-p00-ob.smtp.rzone.de. 86400 IN AAAA 2a01:238:20a:202:5300::3
mo6-p00-ob.smtp.rzone.de. 86400 IN AAAA 2a01:238:20a:202:5300::10
mo6-p00-ob.smtp.rzone.de. 86400 IN AAAA 2a01:238:20a:202:5300::9
mo6-p00-ob.smtp.rzone.de. 86400 IN AAAA 2a01:238:20a:202:5300::1
mo6-p00-ob.smtp.rzone.de. 86400 IN AAAA 2a01:238:20a:202:5300::12
mo6-p00-ob.smtp.rzone.de. 86400 IN AAAA 2a01:238:20a:202:5300::5
mo6-p00-ob.smtp.rzone.de. 86400 IN AAAA 2a01:238:20a:202:5300::6
mo6-p00-ob.smtp.rzone.de. 86400 IN AAAA 2a01:238:20a:202:5300::11
;; AUTHORITY SECTION:
. 28336 IN NS c.root-servers.net.
. 28336 IN NS b.root-servers.net.
. 28336 IN NS f.root-servers.net.
. 28336 IN NS l.root-servers.net.
. 28336 IN NS e.root-servers.net.
. 28336 IN NS a.root-servers.net.
. 28336 IN NS g.root-servers.net.
. 28336 IN NS d.root-servers.net.
. 28336 IN NS i.root-servers.net.
. 28336 IN NS k.root-servers.net.
. 28336 IN NS j.root-servers.net.
. 28336 IN NS m.root-servers.net.
. 28336 IN NS h.root-servers.net.
;; Query time: 93 msec
;; SERVER: 172.17.3.1#53(172.17.3.1)
;; WHEN: Thu Jul 28 09:04:56 2016
;; MSG SIZE rcvd: 589