If it’s an user that has “converted” via alien.top’s portal, we can work as a real reddit client and send message on behalf of the user.
If the lemmy user is not on alien.top but wants to enable a two-way bridge, then we will have to do an authentication dance and send messages with passcodes to both reddit and lemmy.
If the user does not want a bridge, we can still send a message to the reddit thread via another bot.
The last one would be the easiest to implement, but I’m avoiding releasing this because it might be taken down due to spam.