mail-plus-corner from coolicons in Line with regular corners. email, envelope, message, add, new, compose, create. Other styles and corners: @coolicons/<style>/<radius>/mail-plus-corner with line, duocolor, duotone, fill or bulk and sharp or round. Leave out regular, like @coolicons/fill/mail-plus-corner, and use @coolicons/mail-plus-corner for line with regular corners.
pnpm dlx shadcn@latest add "https://coolicons.cool/r/mail-plus-corner.json"