Hello Ssion,
these settings you mentioned are the opposite from creating separated tickets.
They are used to enhance the ticket-assignment for incoming emails.
You can try the following in the following order:
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You have to ensure that you do not send the initial email of your email-campain to Zammad itself
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You can set the “FOLLOW-UP-POSSIBLE”-Flag in the group assigned to your email-channel to “do not reopen ticket but create new ticket”
byPARSE