improve email wording

app/handler/dmarc.py

@@ -140,7 +140,7 @@ def apply_dmarc_policy_for_reply_phase(
         alias_from.user.email,
         f"Attempt to send an email to your contact {contact_recipient.email} from {envelope.mail_from}",
         render(
-            "transactional/spoof-reply.txt",
+            "transactional/spoof-reply.txt.jinja2",
             contact=contact_recipient,
             alias=alias_from,
             sender=envelope.mail_from,

templates/emails/transactional/spoof-reply.html

@@ -2,19 +2,21 @@
 
 {% block content %}
 
-    {% call text() %}
-        <h1>
-            An attempt to send a fake email to {{ contact.email  }} from your alias <b>{{ alias.email }}</b> using <b>{{ sender }}</b> has been blocked.
-        </h1>
-    {% endcall %}
+  {% call text() %}
+    <h1>
+      Unauthorized attempt to send an email to {{ contact.email }} from your alias <b>{{ alias.email }}</b> using
+      <b>{{ sender }}</b> has been blocked.
+    </h1>
+  {% endcall %}
 
-    {% call text() %}
-        As a measure to protect against <b>email spoofing</b>, we have blocked an attempt to send an email from your alias <b>{{ alias.email }}</b> using <b>{{ sender }}</b>.
-    {% endcall %}
+  {% call text() %}
+    To protect against <b>email spoofing</b>, only your mailbox can send emails on behalf of your alias.
+    SimpleLogin also refuses emails that claim to come from your mailbox but fail DMARC.
+  {% endcall %}
 
-    {% call text() %}
-        Best, <br/>
-        SimpleLogin Team.
-    {% endcall %}
+  {% call text() %}
+    Best, <br/>
+    SimpleLogin Team.
+  {% endcall %}
 {% endblock %}
 

templates/emails/transactional/spoof-reply.txt

@@ -1,8 +0,0 @@
-{% extends "base.txt.jinja2" %}
-
-{% block content %}
-An attempt to send a fake email to {{ contact.email  }} from your alias {{ alias.email }} using {{ sender }} has been blocked.
-
-As a measure to protect against email spoofing, we have blocked an attempt to send an email from your alias {{ alias.email }} using {{ sender }}.
-{% endblock %}
-

templates/emails/transactional/spoof-reply.txt.jinja2

@@ -0,0 +1,10 @@
+{% extends "base.txt.jinja2" %}
+
+{% block content %}
+  Unauthorized attempt to send an email to {{ contact.email }} from your alias {{ alias.email }} using
+  {{ sender }} has been blocked.
+
+  To protect against email spoofing, only your mailbox can send emails on behalf of your alias.
+  SimpleLogin also refuses emails that claim to come from your mailbox but fail DMARC.
+{% endblock %}
+