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Depending on the mail service you are using, you should be able to simply mark one of the emails as "Not Spam". From then on, emails from that specific address, in this case firstname.lastname@example.org, should no longer be filtered as spam:
If that solution does not work, here is a bit more in depth guide on setting up your notifications to prevent bounce related issues:
There are a few solutions in that guide that may also work, though I am fairly certain that simply marking the email as "Not Spam" should work.