New MX Records

We have just switched our internet connection from cable to fiber. This required a public IP address change. I updated the MX records with our domain host but I am now getting  442 4.4.2 Connection Dropped  errors. Not all mail is doing this but a significant amount. I have several iPhone users who are now not getting mail on their phones but other iPhone users do. I realize it takes a little while to propagate the servers with the new records but it has been over 6 hours. Any help with this would be appreciated.

Thank you
daskas27IT managerAsked:
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Todd NelsonSystems EngineerCommented:
MX records are not necessarily related to the IP address used for OWA and autodiscover.  But in your case, they may be related.

FYI ... Public DNS propogation can take up to 72 hours.

Did you firewall NAT rules get updated?

Keep in mind too with regard to DNS propogation that not all users and phone services use the same DNS hosts and name services.  That could be why you are seeing a varied experience.

My advice ... be patient.

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daskas27IT managerAuthor Commented:
Thank you. Yes, NAT was updated. I guess you are right. Patience has never been one of my virtues.
Erik BjersPrincipal Systems AdministratorCommented:
You can change the TTL on your records to force faster update across the web but without this they can take a long time to replicate.
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daskas27IT managerAuthor Commented:
Hello, All the online tools for looking up mx records and reverse dns show correctly now. However, mail is still staying in the Exchange queue. Do I have to do anything on the Exchange server like stop and start the transport or something?
Todd NelsonSystems EngineerCommented:
Can you perform a successful telnet outside of your network from the Exchange server?  You might need to install the Windows telnet client on the Exchange server.

telnet 25

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If not, then the firewall or ISP is blocking outbound SMTP traffic.
daskas27IT managerAuthor Commented:
The firewall logs show no blocking and I can mail to some domains almost immediately, such as yahoo.
Todd NelsonSystems EngineerCommented:
Any NDRs?

I'm assuming Exchange here...

Run this command to see what the errors (if any) are associated with the messages in the queue.

Get-Message | ft -auto DateReceived,FromAddress,Subject,LastError

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It may be a lot of info posted to the console, so you can run this command to export the data to a CSV file.

Get-Message | SelectObject DateReceived,FromAddress,Subject,LastError | Export-Csv C:\MessageQueueErrors -NoTypeInformation

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daskas27IT managerAuthor Commented:
I can't see all the output from the first command. the second returned an error, "The term 'SelectObject' is not recognized as the name of a cmdlet, etc..
Todd NelsonSystems EngineerCommented:
Sorry... Use "select-object" instead.
daskas27IT managerAuthor Commented:
Yes. It shows me the same thing the message queue shows. a bunch of 421 4.4.2. connection dropped errors.
Todd NelsonSystems EngineerCommented:
How is outbound mail flow configured for your environment?

Exchange >> Smarthost >> Firewall >> Internet?
Exchange >> Firewall >> Internet?
Exchange >> Firewall >> Smarthost >> Internet?

Do you have some sort of content filter between Exchange and the external recipients?

I'm going to ask again ... Can you perform a successful telnet outside of your network from the Exchange server?  Don't check from the firewall.  Check from the Exchange server.
daskas27IT managerAuthor Commented:
Thank you. It was actually the firewall configuration.
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