diff --git a/app/email_utils.py b/app/email_utils.py
index d4ad481a..096ce13d 100644
--- a/app/email_utils.py
+++ b/app/email_utils.py
@@ -167,31 +167,6 @@ def send_cannot_create_domain_alias(user, alias, domain):
     )
 
 
-def send_reply_alias_must_use_personal_email(user, alias, sender):
-    """
-    The reply_email can be used only by user personal email.
-    Notify user if it's used by someone else
-    """
-    send_email(
-        user.email,
-        f"Reply from your alias {alias} only works with your personal email",
-        render(
-            "transactional/reply-must-use-personal-email.txt",
-            name=user.name,
-            alias=alias,
-            sender=sender,
-            user_email=user.email,
-        ),
-        render(
-            "transactional/reply-must-use-personal-email.html",
-            name=user.name,
-            alias=alias,
-            sender=sender,
-            user_email=user.email,
-        ),
-    )
-
-
 def send_email(to_email, subject, plaintext, html):
     if NOT_SEND_EMAIL:
         LOG.d(
diff --git a/email_handler.py b/email_handler.py
index 672adbeb..afe66159 100644
--- a/email_handler.py
+++ b/email_handler.py
@@ -50,7 +50,7 @@ from app.email_utils import (
     send_cannot_create_directory_alias,
     send_cannot_create_domain_alias,
     email_belongs_to_alias_domains,
-    send_reply_alias_must_use_personal_email,
+    render,
 )
 from app.extensions import db
 from app.log import LOG
@@ -328,10 +328,24 @@ class MailHandler:
                 reply_email,
             )
 
-            send_reply_alias_must_use_personal_email(
-                forward_email.gen_email.user,
-                forward_email.gen_email.email,
-                envelope.mail_from,
+            user = gen_email.user
+            send_email(
+                mailbox_email,
+                f"Reply from your alias {alias} only works from your mailbox",
+                render(
+                    "transactional/reply-must-use-personal-email.txt",
+                    name=user.name,
+                    alias=alias,
+                    sender=envelope.mail_from,
+                    mailbox_email=mailbox_email,
+                ),
+                render(
+                    "transactional/reply-must-use-personal-email.html",
+                    name=user.name,
+                    alias=alias,
+                    sender=envelope.mail_from,
+                    mailbox_email=mailbox_email,
+                ),
             )
 
             send_email(
diff --git a/server.py b/server.py
index 00817908..c07aa465 100644
--- a/server.py
+++ b/server.py
@@ -130,6 +130,7 @@ def fake_data():
         activated=True,
         is_admin=True,
         otp_secret="base32secret3232",
+        can_use_multiple_mailbox=True,
     )
     db.session.commit()
 
diff --git a/templates/emails/transactional/reply-must-use-personal-email.html b/templates/emails/transactional/reply-must-use-personal-email.html
index 007f658e..ed237c01 100644
--- a/templates/emails/transactional/reply-must-use-personal-email.html
+++ b/templates/emails/transactional/reply-must-use-personal-email.html
@@ -2,7 +2,7 @@ Hi {{name}} <br><br>
 
 We have recorded an attempt to send an email from your alias <b>{{ alias }}</b> using <b>{{ sender }}</b>. <br><br>
 
-Please note that sending from alias only works from your personal email ({{user_email}}): no one else could send emails on behalf of your alias. <br><br>
+Please note that sending from alias only works from {{mailbox_email}}: only you (i.e. no one else) can send emails on behalf of your alias. <br><br>
 
 Best, <br>
 SimpleLogin team.
diff --git a/templates/emails/transactional/reply-must-use-personal-email.txt b/templates/emails/transactional/reply-must-use-personal-email.txt
index ac6fb2da..1ee52f1f 100644
--- a/templates/emails/transactional/reply-must-use-personal-email.txt
+++ b/templates/emails/transactional/reply-must-use-personal-email.txt
@@ -2,7 +2,7 @@ Hi {{name}}
 
 We have recorded an attempt to send an email from your alias {{ alias }} using {{ sender }}.
 
-Please note that sending from alias only works from your personal email ({{user_email}}): no one else could send emails on behalf of your alias.
+Please note that sending from this alias only works from {{mailbox_email}}: only you (i.e. no one else) can send emails on behalf of your alias.
 
 Best,
 SimpleLogin team.