class UserMailer

def invited(uuid)

didn't seem worth creating an entirely new mailer for.
technically not a 'user' email, but they'll be a user soon.
def invited(uuid)
  @invitation = Invitation.find_by_uuid uuid
  return if @invitation.nil?
  @cta_url = accept_account_invitation_url(@invitation.uuid)
  @values = {
    # Just in case the inviting user has been removed from the team...
    inviter_name: @invitation.from_membership&.user&.full_name || @invitation.from_membership.name,
    team_name: @invitation.team.name,
  }
  mail(to: @invitation.email, subject: I18n.t("user_mailer.invited.subject", **@values))
end

def welcome(user)

def welcome(user)
  @user = user
  @cta_url = account_dashboard_url
  @values = {
    # are there any substitution values you want to include?
  }
  mail(to: @user.email, subject: I18n.t("user_mailer.welcome.subject", **@values))
end