You are able to set your domain preference to limit only users with your domain to create tickets. To do this you will need to go to Configuration > Email > Limit new users to only matching email suffixes'.
You will then need to enter in these suffixes in the Email Suffixes area separated by a comma.
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You are able to set your domain preference to limit only users with your domain to create tickets. To do this you will need to go to Configuration > Email > Limit new users to only matching email suffixes'.
You will then need to enter in these suffixes in the Email Suffixes area separated by a comma.