I have learned that i can not use regex in triggers but in the email filter settings.
Is it a good approach to check via regex if the mail was send from one of our own domains, add an tag to that tickets (e.g. internal) so i can use that for my auto reply filter ?
Or mabye is there another way to achieve my goal? (Not have an individual trigger for each domain)
A filter on your e-mail channel will work but there is a limitation to this: when an internal user creates a ticket with the webinterface instead of mail your mail filter and the corresponding trigger will not work. Can’t you solve this in your trigger by using the organisation as condition? The automatic reply trigger for external contains the condition “Organisation is NOT a,b,c,d” and the trigger for internal user contains the condition “Organisation IS a,b,c,d”