>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
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