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Sending mail using Exchange with 2 domains.

have an exchange server configured for 2 domains. domain1.com and domain2.com
We have a RDNS setup for domain1.com but our ISP will not setup a 2nd?
the problem is that mail for domain2.com is getting stuck in the exchange mail queue and the message "The connection was dropped by the remote host". this happens when we click on the individual queue.
Any thoughts?
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consultkhan
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messages from domain2.com is not being accepted by the ISP so the connection is dropped.
Are you using smarthost for domain2.com ?
THANKS.  
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PCLANTECHS

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no we are not using a smarthost for the 2nd domain. I dont beleive my ISP bellsouth will allow us to use there mail server to send out?
We just have the 2nd domain setup under the email address policy.
We just have the 2nd domain setup under the email address policy.
CORRECT ME IF IAM WRONG.The second domain is not a registered domain.You are just using it to send mails ??
IT WONT WORK AT ALL.Because if it does, it would be spamming.
thanks.
no the 2nd domain is registered and the MX records point to the exchange server.
WE can try using DNS to send out messages.I believe you have a static IP for this DOMAIN.Becuase dynamic IPs are again,most often,blocked for DNS traffic (excessive).
THANKS.
DNS is set to send out messages already? and yes we have a static IP for this domain.
Are you using the same DNS information for both domains?
If not then I would change to that. You cannot have two reverse DNS entries on the same IP address because you can only have one - it is basically asking what is the reverse DNS address for an IP address and only reply can be returned.

Otherwise as long as the DNS is configured correctly and you are using DNS for delivery and not a smart host, then email should flow.

Simon.
can you please specify the correct setting for "using the same DNS information for both domains"?
Thanks
I don't know what else you need to know.

If the MX record for domain1.com is mail.domain1.com then set the MX record for domain2.com to be mail.domain1.com as well. Then anything doing a lookup on the MX records gets information that is the same as the reverse DNS and hopefully what the server announces itself as.

Simon.
Simon, yes we have mail.domain1.com and mail.domain2.com MX records exactly as you describe above.
Our server name is server.domain.local
I guess its possible that there is something else going on here but I am thinking that some mail servers tryingt o do a reverse lookup for mail.domain2.com are seeing the reverse points to mail.domain1.com.
any thoughts?
thanks
If you have MX records set to mail.domain1.com and mail.domain2.com then you don't have it as I have written.

I am talking about the same host name being in the MX records for both domains. So both domains have MX records that are mail.domain1.com.

Simon.
Are you sure mail will still be delivered property?
Example: user@domain2.com will get forwarded to MX entry mail.domain1.com?
Thanks
Remote servers don't care what the MX record is. As long as it points to a valid host it will be delivered. The MX record does not have to be in the same domain as the delivery host. If it did then 1000s of ISPs would have major problems.

Simon.
Then I guess I am not sure what the problem is? both MX records point to the Exchange server and I have the same setup you suggest above?
What else could cause the message "The connection was dropped by the remote host"
Have already confirmed that hte destination emails are valid. Its not like all email gets stuck in the queue either?
Thanks
Do both MX records refer to the same host.
Having two hosts pointing to the same IP address is not the same as having two records that are identical.

Basically what is happening is that the remote side is probably doing a lookup on the sending domain and checking if everything matches. It is very picky if they are dropping it on the mismatched DNS entries, but not unheard of.

Of course presuming that you have checked that you are not blacklisted, no other DNS errors are flagged on something like dnsreport.com etc.

Simon.
so are you saying that we should have mail.domain2.com (the one having the issue) pointing to mail.domain1.com instead of the Ip address?
 
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Sembee
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