When we have bulk tickets come in from a backup report or AV report it all comes from the same notification email address and set as Unassigned.
Given that Atera won't assign a ticket from the Subject line by a 'Keyword' search feature - which I have seen in other ITSM tools, we should have the option to bulk assign to a customer contact (I use a generic contact for each customer for notifications) so I don't have to go into each ticket and assign said contact to align with the customer.
Much like the Bulk assign technician, we should have bulk assign customer contact.
OR - fix your email parser to allow for keywords to assign to a customer contact.