MX Reverse lookups
Mark_Andrews at isc.org
Mark_Andrews at isc.org
Wed Apr 10 07:05:06 UTC 2002
> I'm sure you all have seen this question asked many times but for some
> reason I cannot put in the right search topic to get an answer I understand.
>
> I have one server running sendmail and in addition to the primary domain
> piopc.net I have several virtual e-mail domains also. I've been running
> these for some time and everything works fine (operationally). However an
> ISP in my area has just installed something new on their mail servers that
> is blacklisting my domain. I don't think it's from spam I think it's because
> their software does a reverse lookup on mail that comes in and mine is
> failing.
>
> Below are my zone files and I'm hoping someone can help me with my
> configuration.
> Primary zone file:
>
> $TTL 86400
>
> @ IN SOA ns1.piopc.net. dnsadmin.piopc.net. (
> 20020314002 ; Serial
> 8H ; Refresh
> 2H ; Retry
> 1W ; Expire
> 1D) ; Minimum
>
> NS ns1.piopc.net. ; Primary name server
> NS ns2.piopc.net. ; Secondary name
> server
> MX 10 mail.piopc.net. ; Primary mail server
>
> localhost IN A 127.0.0.1
> dev.piopc.net. IN A 207.14.72.35
> ns1.piopc.net. IN A 207.14.72.25
> ns2.piopc.net. IN A 207.14.72.26
> www.piopc.net. IN A 207.14.72.36
> fp.piopc.net IN A 207.14.72.35
> home.piopc.net. IN A 207.14.72.36
> ftp.piopc.net. IN A 207.14.72.36
> mail.piopc.net. IN A 207.14.72.45
> news.piopc.net. CNAME corp.supernews.com.
> pop3.piopc.net. IN A 207.14.72.45
> smtp.piopc.net. IN A 207.14.72.45
>
> reverse lookup file
>
> $TTL 86400
>
> @ IN SOA ns1.piopc.net. dnsadmin.piopc.net. (
> 20010326002 ; Serial
> 8H ; Refresh
> 2H ; Retry
> 1W ; Expire
> 1D) ; Minimum TTL
>
> NS ns1.piopc.net.
> NS ns2.piopc.net.
>
> 25 IN PTR ns1.piopc.net.
> 27 IN PTR ns2.piopc.net.
> 36 IN PTR www.piopc.net.
> 45 IN PTR mail.piopc.net.
>
>
> Here is one of the zone files:
>
> $TTL 86400
>
> @ IN SOA www.branyik.com. hostmaster.piopc.net. (
>
> 20011115001 ; serial YYYYMMDDXXX
> 7200 ; refresh
> 3600 ; (1 hour) retry
> 1728000 ; (20 days) expire
> 3600) ; (1 hour) minimal
> TTL
>
> ; Name Servers
>
> IN NS ns1.piopc.net.
> IN NS ns2.piopc.net.
> IN MX 10 mail
>
> ; CNAME records
> mail.branyik.com. IN A 207.14.72.45
>
> Do I need to put a PTR record in for each virtual domain. Or should I use a
> CNAME to point my MX record to mail.piopc.net (the mail server).
>
> Thanks for any help you can give me.
>
> V. Branyik
>
>
>
Talk to SPRINT about getting the in-addr.arpa address space delegated
to you. You only need one PTR for any given address. Also if you
don't have a full /24 see RFC 2317 for how to do small delegations.
Mark
; <<>> DiG 9.2.1rc2 <<>> -x 207.14.72.45
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 32366
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;45.72.14.207.in-addr.arpa. IN PTR
;; AUTHORITY SECTION:
14.207.in-addr.arpa. 10800 IN SOA ns1-auth.sprintlink.net. dns-admin.sprintlink.net. 2002032101 43200 3600 2419200 86400
;; Query time: 306 msec
;; SERVER: ::1#53(::1)
;; WHEN: Wed Apr 10 17:00:33 2002
;; MSG SIZE rcvd: 112
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark.Andrews at isc.org
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