Messages going to Spam

Hello list,
My appoligies if you get this message a lot and/or if I'm supposed to know this or something but, why are messages from the list going to my spam folder?
I have experience being on other mailing lists, such as groups.io, and never have I ever had email go to spam.
I wanted to fix this, as I think it’s rather unusual that I subscribe to a discussion list and not receive messages I opted into.
My appoligies for the question,
Thanks in Advance.

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