mastodon.online is one of the many independent Mastodon servers you can use to participate in the fediverse.
A newer server operated by the Mastodon gGmbH non-profit

Server stats:

11K
active users

Felix

Registered for mail today, tested it, liked it. 3 dollar per month seems fair (after all, I just want mail - no VPN, no password manager, no bullshit) Wanted to import my existing mails, but that is only possible if I pay $9 per month.

Sorry, @Tutanota. But that's greedy. If I cannot import my mails as a paying customer and have to keep my old provider for mail history, than I won't switch. I don't want to pay for 2 accounts.