metamaps--metamaps/app/views/mailboxer/notification_mailer/new_notification_email.text.erb

<% mail = ApplicationMailer.mail_for_notification(@notification) %>
<% if mail %>
  <%= mail.text_part&.body&.decoded %>
<% end %>

Make sense with Metamaps

<%= render partial: 'shared/mailer_unsubscribe_link' %>