Exchange Server On-Premise: SMTP Receive connectors, Send with email alias

 

In case you want send using email aliases of the mailbox in a Exchange Server receive connector rember to set this permission 

Get-ReceiveConnector "name" | Add-ADPermission -ExtendedRights:ms-Exch-SMTP-Accept-Any-Sender -user  "NT AUTHORITY\Authenticated Users"

Otherwise your internals emails from lob or device will from always from default email address