diff --git a/images/common/openwisp/settings.py b/images/common/openwisp/settings.py
index bdf16b78..21383039 100644
--- a/images/common/openwisp/settings.py
+++ b/images/common/openwisp/settings.py
@@ -450,8 +450,8 @@
         INSTALLED_APPS.remove("openwisp_monitoring.device")
     if "openwisp_monitoring.check" in INSTALLED_APPS:
         INSTALLED_APPS.remove("openwisp_monitoring.check")
-if EMAIL_BACKEND == "djcelery_email.backends.CeleryEmailBackend":
-    INSTALLED_APPS.append("djcelery_email")
+if EMAIL_BACKEND == "post_office.EmailBackend":
+    INSTALLED_APPS.append("post_office")
 if env_bool(os.environ.get("METRIC_COLLECTION", "True")):
     INSTALLED_APPS.append("openwisp_utils.metric_collection")
 
diff --git a/images/openwisp_base/Dockerfile b/images/openwisp_base/Dockerfile
index 7c5623bc..3dd0bd1a 100644
--- a/images/openwisp_base/Dockerfile
+++ b/images/openwisp_base/Dockerfile
@@ -119,7 +119,7 @@ ENV DASHBOARD_APP_SERVICE=dashboard \
     INFLUXDB_HOST=influxdb \
     INFLUXDB_PORT=8086 \
     INFLUXDB_DEFAULT_RETENTION_POLICY=26280h0m0s \
-    EMAIL_BACKEND=djcelery_email.backends.CeleryEmailBackend \
+    EMAIL_BACKEND=post_office.EmailBackend \
     EMAIL_HOST=postfix \
     EMAIL_HOST_PORT=25 \
     EMAIL_HOST_USER="" \
diff --git a/images/openwisp_base/requirements.txt b/images/openwisp_base/requirements.txt
index 0acde84f..077db911 100644
--- a/images/openwisp_base/requirements.txt
+++ b/images/openwisp_base/requirements.txt
@@ -7,7 +7,7 @@ supervisor>=4.3.0,<4.4.0
 django-cors-headers>=4.9.0,<4.10.0
 django-pipeline>=4.1.0,<4.2.0
 uwsgi>=2.0.30,<2.1.0
-django-celery-email~=3.0.0
+django-post-office>=3.8.0,<3.9.0
 tldextract>=5.3.0,<5.4.0
 # these add support for object storage
 # (eg: Amazon S3, GCS)