diff --git a/CHANGELOG.md b/CHANGELOG.md
index 703c00f..2241708 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@
 * Make the required single platform destination explicit when creating an installation
 * Fix installation form submission on NetBox v4.6.5 when form mixins return no cleaned-data value
 * Prevent the notification log creation flag from shadowing Django's translation function during email delivery
+* Use NetBox's configured `EMAIL['FROM_EMAIL']` value as the SMTP sender instead of Django's localhost fallback
 
 ### Added
 
diff --git a/netbox_slm/__init__.py b/netbox_slm/__init__.py
index 768d451..fff3279 100644
--- a/netbox_slm/__init__.py
+++ b/netbox_slm/__init__.py
@@ -17,7 +17,7 @@ limitations under the License.
 from netbox.plugins import PluginConfig
 from django.utils.translation import gettext_lazy as _
 
-__version__ = "1.12.2"
+__version__ = "1.12.3"
 
 
 class SLMConfig(PluginConfig):
diff --git a/netbox_slm/jobs.py b/netbox_slm/jobs.py
index 940b1e9..051da6e 100644
--- a/netbox_slm/jobs.py
+++ b/netbox_slm/jobs.py
@@ -81,7 +81,8 @@ class LicenseExpirationNotificationJob(JobRunner):
                 body += "\n" + _("Provider portal: %(url)s") % {"url": license.provider_portal_url}
 
             try:
-                send_mail(subject, body, settings.DEFAULT_FROM_EMAIL, [user.email], fail_silently=False)
+                from_email = settings.SERVER_EMAIL or settings.EMAIL_HOST_USER
+                send_mail(subject, body, from_email, [user.email], fail_silently=False)
             except Exception:
                 self.logger.exception(f"Failed to send expiration email for license {license.pk} to user {user}")
             else:
diff --git a/netbox_slm/tests/test_models.py b/netbox_slm/tests/test_models.py
index fb74949..67fd015 100644
--- a/netbox_slm/tests/test_models.py
+++ b/netbox_slm/tests/test_models.py
@@ -4,6 +4,7 @@ from unittest.mock import Mock, patch
 from django.contrib.auth import get_user_model
 from django.contrib.contenttypes.models import ContentType
 from django.core.exceptions import ValidationError
+from django.test import override_settings
 from django.utils import timezone
 from django.utils.translation import gettext, override
 from extras.models import Notification, Subscription
@@ -161,6 +162,7 @@ class ModelTestCase(SlmBaseTestCase):
             license.get_notification_dates(),
         )
 
+    @override_settings(SERVER_EMAIL="netbox@example.com", EMAIL_HOST_USER="smtp-user")
     @patch("netbox_slm.jobs.send_mail")
     def test_expiration_job_notifies_subscribers_once(self, send_mail):
         user = get_user_model().objects.create_user(
@@ -190,6 +192,7 @@ class ModelTestCase(SlmBaseTestCase):
         self.assertEqual(1, Notification.objects.filter(user=user, object_id=license.pk).count())
         self.assertEqual(1, SoftwareLicenseNotificationLog.objects.filter(user=user, license=license).count())
         send_mail.assert_called_once()
+        self.assertEqual("netbox@example.com", send_mail.call_args.args[2])
 
     def test_german_translation(self):
         with override("de"):