I keep receiving large duplicate emails
My iCloud account is receiving the same 22.7mb email which is duplicated generally every 2 minutes (sometimes 3) all day, every day when a local cafe (from whence they come) is open. The email includes an attached, very large jpeg to be used in advertising. It's been happening for 8 days now. There are periods of no emails but, in my opinion, these are when the owner closes her computer as they are out of the cafe's opening hours. I contacted the owner 5 times (before I received a reply) asking her to delete the email from her system. In her reply she stated that she had deleted all communication and hopes this fixes my ongoing internet problems.
I've made a rule that deletes emails from the cafe's address so I'm not seeing them on my 2021 MacBook Pro. However, I see them on my 2014 MacBook Pro, iPhone and iPad for a few minutes before they're deleted.
Is there's anything more I can do? Is my iCloud storage being affected?. I'd also love to know why this might be happening. The cafe's email address is info@[nameofcafe.etc]...so not a free email provider.