Skip to content

Office 365 Hybrid Emails Stuck in Queue: target host responded 421.4.4.1 connection timed out mail-onmicroosft.mail.protecion.outlook.com.

Office 365 Hybrid Emails Stuck in Queue: target host responded 421.4.4.1 connection timed out mail-onmicroosft.mail.protecion.outlook.com.

You receive the following error after running the Hybrid Configuration wizard, all emails are building up in the Exchange Queue.

To resolve this issue, follow the below steps.

Make sure that the all your exchange servers are added to the Send connector, if they are not added you can run the following in PowerShell to add the servers.

Next, if the issue is not fixed enable “Proxy through client access server” on the “Outbound to Office 365” send connector.

Adding the “Proxy through client access server”, has resolved my issue of mail being stuck in the Exchange On-Prem queue.

 

Sharing is caring!

Published inExchange 2016Exchange OnlineOffice 365PowerShell

3 Comments

  1. EA EA

    Thanks man

  2. ah27 ah27

    it works. thanks

  3. Jeremy Jeremy

    Thank you!!! OMG M$oft support is terrible…

Leave a Reply

Your email address will not be published. Required fields are marked *