>>Does anyone know if a good program to check if your DNS is correct.
>nslookup, dig, www.samspade.org, DNS Expert Pro.
Len, thanks for the great link. Sam Spade has an incredible freeware Windows
program that does DNS checks, SMTP relay checks, blacklist checks as well as
all the standard ping, dig, tracert, whois, etc. Perfect for admins on this
list.
T. Bradley Dean
(800) 793-8171 Ext. 336
[EMAIL PROTECTED]
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Len Conrad
Sent: Friday, March 02, 2001 12:44 AM
To: [EMAIL PROTECTED]
Subject: RE: [IMail Forum] Delivery problem
>I have been having the same problems with Ucalgary.ca, so after seeing
>others having the same problem i decided to call them. I talked to the
Mail
>admin and he said that we (i) am having problems because of DNS not
configed
>right.
THEIR DNS setup is total disaster. I don't see many as bad as that.
>What there server does is a reverse DNS for ever incomming email
>for there log files) if the server can not reverse Lookup your mail server,
>then it does not allow the message though.
Well, that's as dumb as their own DNS set up.
Here, ever their own forward zone isn't set up. No A record for ucalgary.ca:
dig ucalgary.ca
; <<>> DiG 8.3 <<>> ucalgary.ca
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
>So i did a nslookup from a off site computer useing a different DNS server
>and my mail server could not be resolved, by IP address.
There is a huge number of mail servers that don't have their reverse
zones correct. Reversing the ip address is not a practical policy
for anti-mail abuse because it gives too many false positives.
Ask your web log analyzer to reverse the ip's of all web
visitors. Here, we see 30% of ip's don't have reverse zone defined.
>It worked by name but for them it has to work by IP address also. I
>made so changes and will
>let everyone know if this is the case.
Can you now deliver mail to ucalgary now, every time?
>Does anyone know if a good program to check if your DNS is correct.
nslookup, dig, www.samspade.org, DNS Expert Pro.
Len
http://BIND8NT.MEIway.com : Binary for ISC BIND 8.2.3 for NT4 & W2K
http://IMGate.MEIway.com : Build free, hi-perf, anti-spam mail gateways
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