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Problems send emails through SMTP

Hi, i have a problem after migrate the primary DNS Server. When i send any email with SMTP commands is very slow and many services not function. For example if i want to test my smtp server when i put RCPT TO:xxxxx@yyyy.com the response take abaout 40 sec.
The only change was the Primary DNS Server what configuration can i check? do you have any idea for this problem?
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Orbis
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Orbis
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1 Solution
 
MegaNuk3Commented:
Check your Exchange server settings (might be in your SMTP Virtual Server settings under ESM) and see if it is doing a reverse DNS check on any incoming mail, that can slow things down if there is a problem with the DNS server that the Exchange server is using.
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OrbisAuthor Commented:
yes, maybe i need to gave more information about the migration of DNS. I install in a new server the role DNS and configure each zone and reverse (secundary). (This server are windows 2008 with other language then i can´t follow the process indicate in microsoft) i downgrade the primary DNS and upgrade the new DNS Server like primary. maybe i forget something or i need to do something to solve this issue.
thanks for your help
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MegaNuk3Commented:
Have you checked ESM for the Reverse DNS check? Have you run ExBPA on the server to see if it highlights anything else?
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OrbisAuthor Commented:
ok, i have more information. I resolve for at moment this problem. I put the old DNS Server in the DNS configuration only in the servers with problems. This old server it's not any more primary and it's not configurated in any other place. after that the response was even faster than before migration. is it possible that be a performance problem?
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OrbisAuthor Commented:
i run ExBPA and i didn't see importants errors.
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MegaNuk3Commented:
Have you checked ESM to see if it is showing Exchange as using a Reverse DNS check on incoming messages.
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OrbisAuthor Commented:
i don't know ESM. How can i use it?
I search and i run smtpdiag and this are the results. one of this with the new DNS (error) and the other whit the old (ok).  
dns.19.error.txt
dns.16.ok.txt
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OrbisAuthor Commented:
Sorry, ESM it's a console i don't use this terms. Where can i see this Reverse DNS configuration?
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MegaNuk3Commented:
Open Exchange System Manager
Expand "Servers"
Protocols --> SMTP
default SmTP Virtual Server --> Properties
Delivery tab --> Advanced
Untick "perform reverse DNS Lookup on incoming messages"
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OrbisAuthor Commented:
ok, i found this option and it isn't check. sorry with this but i have all soft in spanish and the traslate in the options some times are very different.
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MegaNuk3Commented:
Ok, are your DNS servers AD integrated? Are they DCs/GCs?

Test them with nslookup and compare the result times for internal and external DNs names
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OrbisAuthor Commented:
no, my DNS aren't AD integrated, but i solve this problem. I put an External DNS in tcp configuration and for now i don't have any problem.
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MegaNuk3Commented:
Ok, feel free to close the question then
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OrbisAuthor Commented:
i accept my own comment beacause after many investigation i solve the problem. Others comments not resolve my issue.
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