lets try this new method.

.gitignore

@@ -13,3 +13,6 @@ dummy_project/*
 .tox/
 messages
 *.sqlite3
+manage.py
+old/
+poetry.lock

django_mailbox/transports/imap.py

@@ -31,6 +31,11 @@ class ImapTransport(EmailTransport):
             'DJANGO_MAILBOX_INTEGRATION_TESTING_SUBJECT',
             None
         )
+        self.delete_message_from_server = getattr(
+            settings,
+            'DJANGO_MAILBOX_DELETE_MESSAGE_FROM_SERVER',
+            True
+        )
         self.hostname = hostname
         self.port = port
         self.archive = archive
@@ -131,7 +136,7 @@ class ImapTransport(EmailTransport):
 
             if self.archive:
                 self.server.uid('copy', uid, self.archive)
-
+            self.delete_message_from_server:
                 self.server.uid('store', uid, "+FLAGS", "(\\Deleted)")
         self.server.expunge()
         return

manage.py

@@ -1,10 +0,0 @@
-#!/usr/bin/env python
-import os
-import sys
-
-if __name__ == "__main__":
-    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "django_mailbox.tests.settings")
-
-    from django.core.management import execute_from_command_line
-
-    execute_from_command_line(sys.argv)

pyproject.toml

@@ -0,0 +1,17 @@
+[tool.poetry]
+name = "django-ngmailbox"
+version = "0.1.0"
+description = "I'm forking and making it my own."
+authors = ["Joe <joe@sunset-crew.com>"]
+
+[tool.poetry.dependencies]
+python = "^3.6"
+Django = "^3.1.6"
+
+[tool.poetry.dev-dependencies]
+pytest = "^6.2.2"
+pytest-django = "^4.1.0"
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"