diff --git a/.flake8 b/.flake8
index 1f20aa3..313442c 100644
--- a/.flake8
+++ b/.flake8
@@ -1,2 +1,2 @@
 [flake8]
-exclude = django_mailbox/migrations, django_mailbox/south_migrations
+exclude = django_mailbox/migrations
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 4b78b85..4b8416e 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -23,6 +23,8 @@ jobs:
         - '3.10'
         - '3.11'
         - '3.12'
+        - '3.13'
+        - '3.14'
 
     steps:
     - uses: actions/checkout@v4
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index b9e3d77..0dbd0bd 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,6 +1,13 @@
 Changelog
 =========
 
+Unreleased
+-----
+
+* Add Python 3.13, 3.14 support
+* Add Django 5.1, 5.2, 6.0 support
+* Remove support for deprecated Django versions
+
 4.9.0
 -----
 
diff --git a/django_mailbox/models.py b/django_mailbox/models.py
index 703dd80..b28850b 100644
--- a/django_mailbox/models.py
+++ b/django_mailbox/models.py
@@ -310,7 +310,7 @@ class Mailbox(models.Model):
                 )
         elif (
             settings['strip_unallowed_mimetypes']
-            and not msg.get_content_type() in settings['allowed_mimetypes']
+            and msg.get_content_type() not in settings['allowed_mimetypes']
         ):
             for header, value in msg.items():
                 new[header] = value
@@ -674,10 +674,9 @@ class Message(models.Model):
         message.extra_headers['Date'] = formatdate()
         message.extra_headers['In-Reply-To'] = self.message_id.strip()
         message.send()
+
         return self.mailbox.record_outgoing_message(
-            email.message_from_string(
-                message.message().as_string()
-            )
+            message.message()
         )
 
     @property
diff --git a/setup.cfg b/setup.cfg
index 68ebb70..7b8b376 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -2,3 +2,8 @@
 norecursedirs=env docs lib .eggs
 DJANGO_SETTINGS_MODULE=django_mailbox.tests.settings
 addopts = --tb=short -rxs
+
+[tool:pytest]
+norecursedirs=env docs lib .eggs
+DJANGO_SETTINGS_MODULE=django_mailbox.tests.settings
+addopts = --tb=short -rxs
diff --git a/setup.py b/setup.py
index 668b936..3f1b23e 100755
--- a/setup.py
+++ b/setup.py
@@ -39,11 +39,11 @@ setup(
         'License :: OSI Approved :: MIT License',
         'Operating System :: OS Independent',
         'Framework :: Django',
-        'Framework :: Django :: 3.2',
-        'Framework :: Django :: 4.0',
-        'Framework :: Django :: 4.1',
         'Framework :: Django :: 4.2',
         'Framework :: Django :: 5.0',
+        'Framework :: Django :: 5.1',
+        'Framework :: Django :: 5.2',
+        'Framework :: Django :: 6.0',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.8',
diff --git a/tox.ini b/tox.ini
index a23030c..d698922 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,11 +2,11 @@
 # sort by django version, next by python version
 envlist=
     flake8
+    py{312,313,314}-django60
+    py{310,311,312,313,314}-django52
+    py{310,311,312}-django51
     py{310,311,312}-django50
     py{38,39,310,311}-django42
-    py{38,39,310,311}-django41
-    py{38,39,310}-django40
-    py{38,39,310}-django32
 
 [gh-actions]
 python =
@@ -23,11 +23,11 @@ passenv=
     EMAIL_PASSWORD
     EMAIL_SMTP_SERVER
 deps=
+    django60: Django>=6.0,<6.1
+    django52: Django>=5.2,<6.0
+    django51: Django>=5.1,<5.2
     django50: Django==5.0,<5.1
     django42: Django>=4.2,<5.0
-    django41: Django>=4.1,<4.2
-    django40: Django>=4.0,<4.1
-    django32: Django>=3.2,<4.0
     -r{toxinidir}/test_requirements.txt
 sitepackages=False
 commands=