Force same domain emails to use MX records

I have setup MX records to use both Google SMTP server [1st priority] and Plesk Mail Server. I have a few email accounts that use Google Workspace and a quite a few other email accounts that use Plesk Mail server. The setup works perfectly - email sent to the user at Google SMTP server is received. Other email accounts are able to use Plesk email server to receive and send emails.

However, biggest caveat is when a Plesk email server user sends to a Google SMTP server user, it does NOT go to...

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