Sa mastodon.social kasi ako nag-register last month. When I woke up earlier, I got a notif that someone signed the same email to a different instance (mastodon.ph).
Weird. Mastodon instances can only share what's public and email isn't one of 'em. Only possible explanation is that someone knew or managed to acquire your email address or managed to take a guess. But the motivation behind it is puzzling.