On 2/20/2016 11:26 AM, Curtis Maurand wrote:
On 2/20/2016 11:12 AM, Christian Kivalo wrote:
On 2016-02-20 16:45, Curtis Maurand wrote:
Not sure if I found something or not. A client tried to send email
to one of my other addresses. The requisite portion of the main.cf
follows at the end of the message. The logs are telling me:
Feb 19 16:30:29 ispconfig postfix/smtpd[18437]: warning: hostname
delivery.mailspamprotection.com does not resolve to address
108.163.243.188
Feb 19 16:30:29 ispconfig postfix/smtpd[18437]: connect from
unknown[108.163.243.188]
Feb 19 16:30:29 ispconfig postfix/smtpd[18437]: NOQUEUE: reject: RCPT
from unknown[108.163.243.188]: 450 4.7.1 Client host rejected: cannot
find your hostname, [108.163.243.188];
from=<edi...@whiteeaglenews.com> to=<cmaur...@xyonet.com> proto=ESMTP
helo=<delivery.mailspamprotection.com>
Have you had dns lookup problems? This is a temporary error and the
client should retry delivery
450 4.7.1 Client host rejected: cannot find your hostname,
[108.163.243.188]:
retry timeout exceeded
the original message was sent on the 15th. the return bounce on the
19th. I haven't rebooted or restarted services on that machine and
all of the included lookups for this mail message were performed on
the same machine this morning.
i just sent myself a test message from the client's system. Here is
what I got. I immediately ran the lookups using dig. postfix can't
seem to resolve things properly. Running Ubuntu Server 14.04 LTS with
ispconfig installed. I'm using powerdns with powerdns recursor.
resolv.conf points to the localhost's external ip address. This is sort
of annoying. I really don't want to open up the server's to
misconfigured system as that increases the amount of spam dramatically.
Feb 20 11:31:45 ispconfig postfix/smtpd[16013]: warning: hostname
delivery.mailspamprotection.com does not resolve to address 108.163.220.52
Feb 20 11:31:45 ispconfig postfix/smtpd[16013]: connect from
unknown[108.163.220.52]
Feb 20 11:31:45 ispconfig postfix/smtpd[16013]: NOQUEUE: reject: RCPT
from unknown[108.163.220.52]: 450 4.7.1 Client host rejected: cannot
find your hostname, [108.163.220.52]; from=<cmaur...@whiteeaglenews.com>
to=<cmaur...@xyonet.com> proto=ESMTP helo=<delivery.mailspamprotection.com>
Feb 20 11:31:45 ispconfig postfix/smtpd[16013]: disconnect from
unknown[108.163.220.52]
Feb 20 11:32:01 ispconfig postfix/smtpd[16013]: connect from localhost[::1]
Feb 20 11:32:01 ispconfig postfix/smtpd[16013]: lost connection after
CONNECT from localhost[::1]
Feb 20 11:32:01 ispconfig postfix/smtpd[16013]: disconnect from
localhost[::1]
root@ispconfig:/var/www/webmail.xyonet.com/web# dig
delivery.mailspamprotection.com |grep 108.163.220
delivery.mailspamprotection.com. 30 IN A 108.163.220.50
delivery.mailspamprotection.com. 30 IN A 108.163.220.51
delivery.mailspamprotection.com. 30 IN A 108.163.220.53
delivery.mailspamprotection.com. 30 IN A 108.163.220.54
delivery.mailspamprotection.com. 30 IN A 108.163.220.52
root@ispconfig:/var/www/webmail.xyonet.com/web# dig ptr
52.220.163.108.in-addr.arpa
; <<>> DiG 9.9.5-3ubuntu0.7-Ubuntu <<>> ptr 52.220.163.108.in-addr.arpa
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32216
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;52.220.163.108.in-addr.arpa. IN PTR
;; ANSWER SECTION:
52.220.163.108.in-addr.arpa. 3495 IN PTR delivery.mailspamprotection.com.
--
Curtis Maurand
cur...@maurand.com <mailto:cur...@maurand.com>
207-252-7748
--
Curtis Maurand
cur...@maurand.com <mailto:cur...@maurand.com>
207-252-7748
