invalidemail not really. imessage works like that to make texting a non-apple device less enjoyable.
there's a few workarounds, but none are great imo. one possible option is using google messages, which uses some trickery to convert those messages to emojis. however that requires giving google access to all your messaging, which is not stellar. it also sends folks on imessage the ugly little liked messages instead of reactions, so it only pretends to solve the issue
the other is getting your friends to use signal for messaging. very nice application but it's a herculean effort to get anyone to convert in my experience.