Nagios Support Forum

Dear admins,

I tried to use the mail address but that address (******@nagios.com) does not exist.

Please excuse me for putting it on the forum.
If this message is misplaced here please feel free to move this message to the correct place



Hi,

Just want to tell you that your mail is bouncing back because you have not set up (or your ISP) a correct reverse DNS entry for the mailserver from which you are emailing.

LOG:
Jul 7 14:03:38 simpy06 mx0/smtpd[7278]: NOQUEUE: reject: RCPT from unknown[2600:f03c:91ff:fedf:d6ac]: 450 4.7.1 Client host rejected: cannot find your hostname, [2600:f03c:91ff:fedf:d6ac]; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<support.nagios.com>

For that reason our ISP is blocking all e-mail from you. And I cannot register on the forum with my business mail address (I am sending this mail from a private address)

Could you please fix the problem so I can register with my business mail address?

Kind regards,

Ronald

Not the case:
** EDIT **

Sorry, I didn't know you were trying to lookup the PTR on an IPv6 address. I'll forward this info to the appropriate individuals, but I can't promise results. You might consider disabling IPv6 on your mail server - the world isn't ready.

jdalrymple wrote:Not the case:

Code: Select all

[jdalrymple@localhost ~]$ dig -x 66.228.48.232 @8.8.8.8

; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.30.rc1.el6_6.2 <<>> -x 66.228.48.232 @8.8.8.8
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 55790
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;232.48.228.66.in-addr.arpa.    IN      PTR

;; ANSWER SECTION:
232.48.228.66.in-addr.arpa. 20986 IN    PTR     support.nagios.com.

;; Query time: 32 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Wed Jul 22 10:21:07 2015
;; MSG SIZE  rcvd: 76

This is IPv4

I am talking about IPv6

reject: RCPT from unknown[2600:f03c:91ff:fedf:d6ac]

I have no influence on the config of the mailserver of the ISP .. They use this as a security measurement so it will not be disabled.
I know IPv6 is still not ready in the world.. but if we don't work on it, it will never be.. (the need gets higher more and more)

Try it again. Looks like our mail admin added the AAAA record for support.nagios.com

tmcdonald wrote:Try it again. Looks like our mail admin added the AAAA record for support.nagios.com

Will wait a few days.
It could take some time before all DNS are up-2-date.

Thanks anyway

Sounds good, let us know.

tmcdonald wrote:Try it again. Looks like our mail admin added the AAAA record for support.nagios.com

still no luck..

dig +short support.nagios.com AAAA
2600:f03c:91ff:fedf:d6ac

dig -x 2600:f03c:91ff:fedf:d6ac @8.8.8.8

; <<>> DiG 9.8.3-P1 <<>> -x 2600:f03c:91ff:fedf:d6ac @8.8.8.8
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 34591
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;c.a.6.d.f.d.e.f.f.f.1.9.c.3.0.f.0.0.0.0.0.0.0.0.0.0.c.3.0.0.6.2.ip6.arpa. IN PTR

;; AUTHORITY SECTION:
0.0.c.3.0.0.6.2.ip6.arpa. 1799 IN SOA ns1.linode.com. dns.linode.com. 2015072628 14400 14400 1209600 86400

;; Query time: 108 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Mon Jul 27 08:48:56 2015
;; MSG SIZE rcvd: 144

We asked our mail admin for an update and have yet to get a response. Will post back when we know more.

Just wondering if you are still seeing this issue from your end.

still no reverse resolving..

dig -x 2600:f03c:91ff:fedf:d6ac @8.8.8.8

; <<>> DiG 9.8.3-P1 <<>> -x 2600:f03c:91ff:fedf:d6ac @8.8.8.8
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 44205
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;c.a.6.d.f.d.e.f.f.f.1.9.c.3.0.f.0.0.0.0.0.0.0.0.0.0.c.3.0.0.6.2.ip6.arpa. IN PTR

;; AUTHORITY SECTION:
0.0.c.3.0.0.6.2.ip6.arpa. 1799 IN SOA ns1.linode.com. dns.linode.com. 2015081448 14400 14400 1209600 86400

;; Query time: 117 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Sat Aug 15 04:24:04 2015
;; MSG SIZE rcvd: 144