Now you probably found a solution, so this is for whomever encounter the
same problem. If you want to only send transactional emails to a
specific email domain. You need to add a specific typology rule for each
event. After you created the typology rule, you need to select edit and
the select "Advanced Information" and change the filtering dimension to
the event (that is associated with the transactional email). Then you
can add a "Email does not contain @YOURCOMPANY.COM" to make sure only
"@YOU...