Mail sending issue after cinfigure Pop3.

Question

We have on-premises exchange server 2016. We have Configured outlook using Pop3. Internally incoming and outgoing mail is okay, but we facing issue when sending mail externally.

Answer 1

Hi,

Could you please provide more information,

1.Did you get any NDR while sending email to external email address
2.External email issue is only with this account or for all - If all, is the send connector configured properly with smarthost (if any) or DNS MX for submit external emails?
3.If there is no NDR, can you check if its stuck in the Queue, check the last error in queue if any
4.Can you check for the message tracking log
Get-TransportService | Get-MessageTrackingLog -ResultSize Unlimited -Sender "user@yourdomain.com" -Recipients "user@externaldomain.com"

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Answer 2

anonymous user

Since Microsoft Q&A is a public platform, we will help to cover your email address in your reply. Please pay attention to cover personal information next time.

What's the detailed version of your Exchange 2016, please check with the following command:

Get-ExchangeServer | Format-List Name,Edition,AdminDisplayVersion  

Did you try to relay messages to external users from your application or services?
If so, as AshokM-8240 mentioned, please created a dedicated Receive connector for anonymous relay.

If you just try to send from the user mailbox in your organization, please check if other user mailboxes can send messages to external recipients.
You can use this command to check send connector settings. You can post the screenshot here and don't forget to cover your personal information:

Get-SendConnector|fl  

Additionally, I make some modification on the command provided by AshokM-8240. You can use it to list some important information for message tracking:

Get-TransportService|Get-MessageTrackingLog -MessageSubject <subject> -Sender <mailbox address> -Recipients <mailbox address> |select timestamp,EventID,Source,ConnectorID|sort-object Timestamp  

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