diff --git a/app/account_linking.py b/app/account_linking.py
index f886453d..754dd12f 100644
--- a/app/account_linking.py
+++ b/app/account_linking.py
@@ -9,7 +9,7 @@ from typing import Optional
 
 from app import config
 from app.db import Session
-from app.email_utils import send_email_at_most_times, render
+from app.email_utils import send_email_at_most_times, send_welcome_email, render
 from app.errors import AccountAlreadyLinkedToAnotherPartnerException
 from app.log import LOG
 from app.models import (
@@ -182,6 +182,9 @@ class NewUserStrategy(ClientMergeStrategy):
         )
         Session.commit()
 
+        if not new_user.created_by_partner:
+            send_welcome_email(new_user)
+
         agent.record_custom_event("PartnerUserCreation", {"partner": self.partner.name})
 
         return LinkResult(
diff --git a/app/models.py b/app/models.py
index b63dc7ac..bd8812b8 100644
--- a/app/models.py
+++ b/app/models.py
@@ -525,6 +525,12 @@ class User(Base, ModelMixin, UserMixin, PasswordOracle):
             - CustomDomain.filter_by(user_id=self.id, is_sl_subdomain=True).count(),
         )
 
+    @property
+    def created_by_partner(self):
+        return User.FLAG_CREATED_FROM_PARTNER == (
+            self.flags & User.FLAG_CREATED_FROM_PARTNER
+        )
+
     @staticmethod
     def subdomain_is_available():
         return SLDomain.filter_by(can_use_subdomain=True).count() > 0
diff --git a/tests/models/test_user.py b/tests/models/test_user.py
index 98b9d85c..3e39804f 100644
--- a/tests/models/test_user.py
+++ b/tests/models/test_user.py
@@ -21,3 +21,11 @@ def test_create_from_partner(flask_client):
     assert job is not None
     assert job.name == config.JOB_SEND_PROTON_WELCOME_1
     assert job.payload.get("user_id") == user.id
+
+
+def test_user_created_by_partner(flask_client):
+    user_from_partner = User.create(email=random_email(), from_partner=True)
+    assert user_from_partner.created_by_partner is True
+
+    regular_user = User.create(email=random_email())
+    assert regular_user.created_by_partner is False