Name or service unknown

[unixfreak]

Hi,
I'm a pussled by this message and rejecting most emails from correctly setup email systems:

Sep 15 09:26:16 localhost postfix/smtp[4554]: warning: no MX host for test.com has a valid A record
Sep 15 09:26:16 localhost postfix/smtp[4554]: 01D14F0: to=<test@test.com>, relay=none, delay=1, status=bounced ([test.com.s200b2.psmtp.com]: Name or service not known)

I've upgraded Debian (hence gone from 2.1.4 to 2.1.5) and is using the same config file. Why is this happening?

Cheers

 

[unixfreak]

Also, if I enable 'reject_unknown_client', which worked previously, I get:

Sep 15 09:32:50 localhost postfix/smtpd[4600]: NOQUEUE: reject: RCPT from unknown[207.126.144.85]: 450 Client host rejected: cannot find your hostname, [207.126.144.85]; from=<henrik.morsing@camelotinteractive.com> to=<henrik@morsing.cc> proto=SMTP helo=<psmtp.com>

for pretty much any client sending even though I get:

emil:/etc/postfix# dig -x 207.126.144.85

; <<>> DiG 9.2.4 <<>> -x 207.126.144.85
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 54841
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 6, ADDITIONAL: 0

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

;; ANSWER SECTION:
85.144.126.207.in-addr.arpa. 14400 IN PTR s200aog1.obsmtp.com.

;; AUTHORITY SECTION:
144.126.207.in-addr.arpa. 14400 IN NS ns7.ns.postini.com.
144.126.207.in-addr.arpa. 14400 IN NS ns1.ns.postini.com.
144.126.207.in-addr.arpa. 14400 IN NS ns2.ns.postini.com.
144.126.207.in-addr.arpa. 14400 IN NS ns4.ns.postini.com.
144.126.207.in-addr.arpa. 14400 IN NS ns5.ns.postini.com.
144.126.207.in-addr.arpa. 14400 IN NS ns6.ns.postini.com.

;; Query time: 528 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu Sep 15 09:33:21 2005
;; MSG SIZE rcvd: 197

 

[unixfreak]

This is getting stupid. Me and a friend both upgraded Debian 3.0 to 3.1 which means an upgrade from postfix 2.1.4 to 2.1.5. We both immidiately ran into the same problem which was 'private/policy' not working. The problems then extended for me only, to the mail server rejecting everything if I set 'reject_unknown_sender' because it couldn't lookup IP addresses and it also complained about 'no MX servers having an A record'. Neither of these claims are true.

I have now upgraded to 2.2 to get rid of these bugs but it hasn't fixed any of them.

Has no-one experienced these issues? What could they be caused by?

Thanks in advance

 

[jkupski]

Your problems appear to be DNS related. One idea: are you running postfix chrooted? If so, have you copied /etc/resolv.conf into the jail?

 

[unixfreak]

Thanks but it's not in a jail and it's nothing related to DNS itself. Postfix 2.1.5 and 2.2 both have an issue with reverse DNS. What it is I don't know.