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I just got an email from Mastadon about Threads federating. I closed my Mastadon account about 5 minutes after joining.
(i.imgur.com)
I received an email about threads and Mastadon a bit ago. The thing is I deleted my Mastadon account a hot minute after I created it. The email has no way to unsubscribe from it 
I would like to be comforted that I’m overthinking this. My Mastadon account was a couple of years ago in both creation and deletion. It’s incredibly disconcerting.
You don't have an account with Mastodon. You have a Mastodon account with sdf.org. Their mailing list that sent the email and the Mastodon instance they run are probably separate systems. You can forward your email to membership@sdf.org and ask to be removed.
Thank you. This is helpful. It’s 4am here and anxiety is a fucking brutal boss. Cheers