Re: MX Record and Website apps that send responses from web host s
From: Lanwench [MVP - Exchange] (lanwench_at_heybuddy.donotsendme.unsolicitedmail.atyahoo.com)
Date: 12/23/04
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Date: Thu, 23 Dec 2004 12:28:35 -0500
smiley wrote:
> "Lanwench [MVP - Exchange]" wrote:
>
>> smiley wrote:
>>> Hello,
>>>
>>> I have runinto thei issue several times but have never posted the
>>> question. I have am running exchange 2003. I have an internal mx
>>> record pointing to my intenal dns.
>>
>> Why? You don't need internal MX records.
>>
>>> The company that is hosting my
>>> external dns also host my external mx record....this seems to be the
>>> norm.
>>
>> Yes -
>>
>>> the problem I am running into is that the company that host my
>>> website, which has asp/php applications can not send email responses
>>> back to an internal mail account because my external mx record does
>>> not point to them.
>>
>> This doesn't make any sense. What's your domain name? What do you
>> have set up in your recipient policy as the default domain for all
>> mailboxes on your server? What address is this application trying to
>> send to?
>>
>>> My quesion is then...who should host my external
>>> MX record?
>>
>> Whomever hosts your domain's public DNS.
>>
>>> does it really matter? Everything seems to work fine with
>>> the current configuration, what will happen if I have my DNS company
>>> redirect the mx record to my web hosting company ip address?
>>
>> You won't get any Internet mail delivered to your Exchange server.
>>
>>> Hope
>>> this is not too confusing....
>
> Let me just say that I am new to network administration..I am also
> new to this company and did not set this exchange box up. I have
> reviewed the default recipient policy and it is set to the proper
> domain name and only this domain. Could the problem be that the
> domain name is .coop, this is a stretch, but worth asking? The
> company changed from .net to .coop this last summer and this is when
> the problem started to occur.
Shouldn't be a problem if it's set up right.
> I figured that if I had my external dsn host midify the mx record to
> point to the webhost ip (recommended by the webhost compamny), that
> this would cause problems.
You don't need internal MX records. Your public DNS is where your MX records
need to be - and they can't point at IP addresses, they have to point at A
records (mail.mydomain.com) that themselves point to the public IP address
you use on your network - your firewall/router should forward port 25
traffic to your exchange server's internal IP address.
>
> I have posed the question to my web host company and they replied
> with this:
>
> What happens now is when you submit a form from Aussie server it is
> not reaching the mail box of your mail server (which is located
> somewhere) but not at Aussiehost, so you need to change the MX record
> of that mail server to point to Aussie host.
Mail servers don't have MX records - DNS has MX records, which are
references to mail servers. Your form on this website is set to go to an
email address on your .coop domain right? So once that domain's mail/DNS is
set up properly, it should work fine. Your public webserver should have
nothing to do with this.
>
> But I figured that if I redireted mx record I would be in a world of
> hurt.
No, you need to do this if you want to receive mail directly on your
Exchange server.
> Would there be something that my external dns/mx provider can
> do to make sure that this email address is forwarded to the proper
> domain? Do I need to set up some type of forwarder with the mx redord
> host?
It isn't a forwarder - you need to make sure your public DNS server is set
up with the right A record and then create the MX record that points at it.
You do not need internal MX records on your domain.
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