This is probably super obvious but you can mention someone on another instance as @email@example.com
It can also make searching for a specific account from another account easier.
The two @'s make me twitch because it pings as a malformed email, but if I could get used to moving from !-style emails to @, I can deal with this.
@kitkendrick perhaps there's a role for % addressing here. firstname.lastname@example.org%mastodon.social
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