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Re: [OCLUG-Tech] Postifx/SMTP problem - Sender address rejected

Michael Walma wrote:
Hello All:

I have an odd problem where some sites are refusing to accept mail from me. 99% of sites will accept mail from me, a but a few reject mail with the following response:

I get the following:

bill@laptop:~$ nslookup
> set q=mx
> walma.org
Server:         192.168.2.1
Address:        192.168.2.1#53

Non-authoritative answer:
walma.org       mail exchanger = 100 kamps.ca.
walma.org       mail exchanger = 10 walma.org.

Authoritative answers can be found from:
walma.org       nameserver = ns.kamps.ca.
walma.org       nameserver = ns1.walma.org.
kamps.ca        internet address = 66.11.174.116
walma.org       internet address = 64.26.160.120
ns.kamps.ca     internet address = 66.11.174.116
ns1.walma.org   internet address = 64.26.160.120
> set q=ns
> walma.org
Server:         192.168.2.1
Address:        192.168.2.1#53

Non-authoritative answer:
walma.org       nameserver = ns.kamps.ca.
walma.org       nameserver = ns1.walma.org.

Authoritative answers can be found from:
ns.kamps.ca     internet address = 66.11.174.116
ns1.walma.org   internet address = 64.26.160.120

But, note the following:

bill@laptop:~$ host 66.11.174.116
116.174.11.66.in-addr.arpa domain name pointer pi314159.ott.istop.com.

Your primary mail exchanger box (kamps.ca) does not handle reverse DNS lookups properly. You (actually the kamps.ca tech contact) will probably have to contact Cybersurf to get them to edit the in-addr-arpa record for 66.11.174.116 to get this to resolve properly.

--
Bill Strosberg