>got that far into the handbook, but now it seems I need to reenable it
>to use Imail as a list server for Media Relations.
For some reason, I don't know Exchange relaying options and controls,
but it "should" be able to relay with restrictions that keep it from
being open. Keep reading that handbook.
>Our DNS records are handled by the upstream ISP on the other side of
>the T-1. My understanding is that
>mail from the list server may be rejected by many systems if I relay
>through the proxy server.
???? Don't bother to explain, you're wrong.
>Will proper DNS records on our ISP's server take care of the
>problem, or must I expose this server to the world?
There's really no mystery or complexity, afaics.
Your Internet mail comes in on port 25 and of some public ip of yours
(207.155.61.169), that's all that's needed. It doesn't matter
whether the mail is from your internal Exchange or Imail servers.
# dig mta.net mx
; <<>> DiG 8.3 <<>> mta.net mx
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 5
;; QUERY SECTION:
;; mta.net, type = MX, class = IN
;; ANSWER SECTION:
mta.net. 1D IN MX 10 mtaproxyin.mta.net.
There's no need to touch your DNS, unless you have other mail domains
that you want route through mtaproxyin, like the hostname of the
Imail list server. Then just add more MX records.
The forward MTA.net zone is fine. You might get your ISP's DNS dude
to fix up the reverse zone for your MX ip:
mgw1# dig -x 207.155.61.169
; <<>> DiG 8.3 <<>> -x
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 4
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
The reverse zone is not even assigned, afaics.
Len
http://MenAndMice.com/DNS-training Austin,TX: 23,24/04; SFO,CA:
7,8/05
http://BIND8NT.MEIway.com : ISC BIND 8.2.3 "NT3" for NT4 & W2K
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