If you are running Mastodon and would like to leverage an open relay I'm running to help ... relay, please reach out to me and I'll share the address.
Open relays are allow smaller instances to become more connected by relaying their traffic to other participants. The biggest one, mastodon.host recently went offline which severely hampered smaller shops.
BTW - this relay also works for any app that uses ActivityPub, so almost everyone.
You can reach me on mastodon (at)derek(at)toot.thedoodleproject.net