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Email is still great for DMs if you only use it for talking to individuals, and not to sign up to things
(self.showerthoughts)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
I still use this that way. One is group of instructors for something like Scouts, we plan trips and stuff like that but also lan parties and going to pub. There are loads of people using different DM services but all of us have email.
And we have family wishlist email where we send what we want for Christmas and birthdays, anyone can look it up and buy/make something.