I’m interested in setting up my own instances for Lemmy, Mastodon, and Matrix. Can I use the same https://domain.tld for all of them without any subdomains? For example: lemmyuser@mydomain.tld mastodonuser@mydomain.tld matrixuser@mydomain.tld Will this work across all of my self-hosted instances, or do I need to append a subdomain for each, e.g., lemmyuser@lemmy.mydomain.tld?