In Exchange, whether it is Exchange 2019 or 2013 or 2016 or 2010, you need a send connector to be able to route email to the internet etc.

You can create a send connector using the Exchange Admin Center (EAC) but what fun would that be when you can use PowerShell.

Here is a quick tip how to create a send connector using DNS with a source space of * using PowerShell:

  • New-SendConnector -Name “Internet Mail” -AddressSpaces * -Internet -SourceTransportServers Exchange-2019

If you launch the EAC, you can see the above send connector that was created:

Hope it helps.