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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.
If you don't want the email and have no unsubscribe button, report as Spam. It sucks but them's the rules.
Already done but more concerned about my data having been stored and no way to ask to have it removed directly. Thank you for your response though. I’m in the UK and the right to be removed from their mailing list is the very least a business related email is supposed to offer.
You won't have to worry about your data. Mastodon is cool.
I literally had account for less than an hour on the site and, after deleting my account a couple of years ago at the end of the time I was there, I receive an email from them. Why do they still have my fucking email address? I’ve submitted a right to be forgotten request anyway.
Hopefully you can get it all sorted out. I guess the account was with Eugen's instance, mastodon.social? Sorry, I initially misread your post.
If you look at the email screenshot it’s from sdf.org. They’re pretty awesome and I’m guessing it’s just some sort of oversight. OP should just send them an email and I’m sure they’d resolve it.
Oh, absolutely! Good people.