getting mail to work
noc at hdk5.net
Wed Mar 14 18:21:25 UTC 2007
Jeffrey Goldberg wrote:
> On Mar 13, 2007, at 8:17 PM, jekillen wrote:
>> On Mar 12, 2007, at 5:14 PM, RW wrote:
>>> Just as long as you understand the distinction between forward and
>>> reverse DNS. Based on the whois record for for your IP address, at the
>>> moment you appear to have the following reverse DNS for the address
>>> range 22.214.171.124 - 126.96.36.199:
>>> $ for i in `jot 8 224` ; do dig +short -x 75.7.236.$i ; done
>> OK, It appears that it is the ISPs name servers who
>> are responding. When I call up my sights I get to the
>> machines they are on according to my present
>> DNS setup.
> But that is what the public sees. If (which I strongly doubt) your
> own internal nameservers give a different result to
> $ dig +short -x 188.8.131.52
> then it still makes no difference to the rest of the world which,
> when doing a *reverse* lookup on your IP address doesn't get anything
> that looks like your domain name.
>> try www.brushandbard.com
> That's not the question. RW was (correctly) talking about *reverse*
> DNS, aka DNS PTR records. That is we are looking at the translation
> *from* number *to* name.
> If you look up one of my statically IP addresses
> $ dig +short -x 184.108.40.206
> you get that instead of
> It took me many unpleasant hours on the phone to Verizon to get the
> reverse look up the way it is now. I spent those hours on the phone
> specifically because I did want to run my own direct to MX mailserver.
I just got this above problem cleared up with the Nework that supplies
my lines and IP addresses.
Is this a common practice that the static IP you get from a Network
Provider will reflect the Network Providers ID not yours? I guess then
you have to include what you expect in your order for a line/s and IP/s.
for running mail servers.
> My mailserver sends out mail as being from lists.shepard-families.org
> (in the envelope and header froms) but identifies itself as
> a regular look up of either of those returns
> A reverse of that turns up
> which when you do a regular lookup gets you
> So my machine is claiming to be in goldmark.org, and doing a reverse
> lookup on its IP address points you back to goldmark.org. So that
> strongly suggests that when it identifies itself as goldmark.org, it
> is doing so with the consent not only of the person who controls the
> goldmark.org domain, but also with the consent of the person (in this
> case Verizon) who controls the IP address of the machine.
> If mail from my machine failed this IP --> name1 --> IP --> name2 -->
> IP test (the test being that name1 and name2 are in the same domain
> and that "IP" is the same IP throughout), then mail from my machine
> would get a high spam score by most systems.
> I really don't want to sound harsh with this, but if you aren't fully
> clear on concepts like reverse and forward DNS and authoritative
> servers for each, you really should be looking for a solution that
> doesn't involve you running a direct to MX system. You can still run
> your own mailserver which you can integrate with your webserver, but
> have it relay all of the outgoing mail to your ISP's SMTP host which
> is set up for the purpose.
> Also if you post your queries to the postfix mailing list (I think I
> recall that you were using postfix) you will probably find lots of
> pointers to information explaining about configuration. "The Book of
> Postfix" (ISBN 1-59327-001-1) has a good discussion of the need for
> other hosts being able to reverse resolve the IP of your mail hub.
~Al Plant - Honolulu, Hawaii - Phone: 808-284-2740
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