diff --git a/mayan/apps/sources/models/email_sources.py b/mayan/apps/sources/models/email_sources.py
index 7b9f8b67d5..a681c7f721 100644
--- a/mayan/apps/sources/models/email_sources.py
+++ b/mayan/apps/sources/models/email_sources.py
@@ -277,10 +277,10 @@ class POP3Email(EmailBaseModel):
         logger.debug('ssl: %s', self.ssl)
 
         if self.ssl:
-            mailbox = poplib.POP3_SSL(host=self.host, post=self.port)
+            mailbox = poplib.POP3_SSL(host=self.host, port=self.port)
         else:
             mailbox = poplib.POP3(
-                host=self.host, post=self.port, timeout=self.timeout
+                host=self.host, port=self.port, timeout=self.timeout
             )
 
         mailbox.getwelcome()
diff --git a/mayan/apps/sources/tests/test_models.py b/mayan/apps/sources/tests/test_models.py
index dfea4f640b..16a6282118 100644
--- a/mayan/apps/sources/tests/test_models.py
+++ b/mayan/apps/sources/tests/test_models.py
@@ -217,7 +217,7 @@ class POP3SourceTestCase(GenericDocumentTestCase):
         def user(self, username):
             return
 
-    @mock.patch('poplib.POP3_SSL')
+    @mock.patch('poplib.POP3_SSL', autospec=True)
     def test_download_document(self, mock_poplib):
         mock_poplib.return_value = POP3SourceTestCase.MockMailbox()
         self.source = POP3Email.objects.create(