If you're on ANY Mastodon server:

Please make sure that the email address associated with your account is one that you check regularly. (If you need to adjust your email address, you can do so under Preferences > Account.)

A reputable Mastodon server will never sell or distribute your email address. However, we may need to contact you outside of Mastodon about your account, so it's important that your address be correct and frequently checked.