app/templates/emails/transactional/reply-must-use-personal-email.html

{% extends "base.html" %}

{% block content %}
  {{ render_text("Hi " + name) }}
  {{ render_text("We have recorded an attempt to send an email from your alias <b>"+ alias +"</b> using <b>" + sender + "</b>.") }}
  {{ render_text("Please note that sending from this alias only works from <b>" + mailbox_email + "</b>.") }}
  {{ render_text("Indeed, only you (or the mailbox that owns <b>" + alias + "</b>) can send emails on behalf of this alias.") }}
  {{ render_text('Thanks, <br />SimpleLogin Team.') }}
{% endblock %}