diff --git a/core/core/wsgi.py b/core/core/wsgi.py
deleted file mode 100644
index f44964d..0000000
--- a/core/core/wsgi.py
+++ /dev/null
@@ -1,16 +0,0 @@
-"""
-WSGI config for core project.
-
-It exposes the WSGI callable as a module-level variable named ``application``.
-
-For more information on this file, see
-https://docs.djangoproject.com/en/4.2/howto/deployment/wsgi/
-"""
-
-import os
-
-from django.core.wsgi import get_wsgi_application
-
-os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'core.settings')
-
-application = get_wsgi_application()
diff --git a/core/mail/models.py b/core/mail/models.py
index 2215fbb..36cd2b3 100644
--- a/core/mail/models.py
+++ b/core/mail/models.py
@@ -29,13 +29,13 @@ class Email(SoftDeleteModel):
             self.save()
 
     def train_spam(self):
-        if ACTIVE_SPAM_TRAINING:
+        if ACTIVE_SPAM_TRAINING and self.raw_file.path:
             import subprocess
             path = self.raw_file.path
             subprocess.run(["rspamc", "learn_spam", path])
 
     def train_ham(self):
-        if ACTIVE_SPAM_TRAINING:
+        if ACTIVE_SPAM_TRAINING and self.raw_file.path:
             import subprocess
             path = self.raw_file.path
             subprocess.run(["rspamc", "learn_ham", path])
diff --git a/core/mail/protocol.py b/core/mail/protocol.py
index 926e8c2..c5aaa4a 100644
--- a/core/mail/protocol.py
+++ b/core/mail/protocol.py
@@ -91,7 +91,7 @@ async def send_smtp(message):
     await aiosmtplib.send(message, hostname="127.0.0.1", port=25, use_tls=False, start_tls=False)
 
 
-def find_active_issue_thread(in_reply_to, address, subject):
+def find_active_issue_thread(in_reply_to, address, subject, event):
     from re import match
     uuid_match = match(r'^ticket\+([a-f0-9-]{36})@', address)
     if uuid_match:
@@ -102,7 +102,7 @@ def find_active_issue_thread(in_reply_to, address, subject):
     if reply_to.exists():
         return reply_to.first().issue_thread, False
     else:
-        issue = IssueThread.objects.create(name=subject)
+        issue = IssueThread.objects.create(name=subject, event=event)
         return issue, True
 
 
@@ -202,11 +202,14 @@ def receive_email(envelope, log=None):
     subject = unescape_and_decode_base64(subject)
     target_event = find_target_event(recipient)
 
-    active_issue_thread, new = find_active_issue_thread(header_in_reply_to, recipient, subject)
+    active_issue_thread, new = find_active_issue_thread(header_in_reply_to, recipient, subject, target_event)
+
+    from hashlib import sha256
+    random_filename = 'mail-' + sha256(envelope.content).hexdigest()
 
     email = Email.objects.create(
         sender=sender, recipient=recipient, body=body, subject=subject, reference=header_message_id,
-        in_reply_to=header_in_reply_to, raw_file=ContentFile(envelope.content), event=target_event,
+        in_reply_to=header_in_reply_to, raw_file=ContentFile(envelope.content, name=random_filename), event=target_event,
         issue_thread=active_issue_thread)
     for attachment in attachments:
         email.attachments.add(attachment)
diff --git a/core/mail/tests/v2/test_mails.py b/core/mail/tests/v2/test_mails.py
index 3df56ca..3b358ca 100644
--- a/core/mail/tests/v2/test_mails.py
+++ b/core/mail/tests/v2/test_mails.py
@@ -142,6 +142,7 @@ class LMTPHandlerTestCase(TestCase):  # TODO replace with less hacky test
         aiosmtplib.send.assert_called_once()
         self.assertEqual('test ä', Email.objects.all()[0].subject)
         self.assertEqual('Text mit Quoted-Printable-Kodierung: äöüß', Email.objects.all()[0].body)
+        self.assertTrue( Email.objects.all()[0].raw_file.path)
 
     def test_handle_quoted_printable_2(self):
         from aiosmtpd.smtp import Envelope
@@ -162,6 +163,7 @@ class LMTPHandlerTestCase(TestCase):  # TODO replace with less hacky test
         aiosmtplib.send.assert_called_once()
         self.assertEqual('suche_Mütze', Email.objects.all()[0].subject)
         self.assertEqual('Text mit Quoted-Printable-Kodierung: äöüß', Email.objects.all()[0].body)
+        self.assertTrue( Email.objects.all()[0].raw_file.path)
 
     def test_handle_base64(self):
         from aiosmtpd.smtp import Envelope
@@ -182,6 +184,7 @@ class LMTPHandlerTestCase(TestCase):  # TODO replace with less hacky test
         aiosmtplib.send.assert_called_once()
         self.assertEqual('test', Email.objects.all()[0].subject)
         self.assertEqual('Text mit Base64-Kodierung: äöüß', Email.objects.all()[0].body)
+        self.assertTrue( Email.objects.all()[0].raw_file.path)
 
     def test_handle_client_reply(self):
         issue_thread = IssueThread.objects.create(
@@ -229,6 +232,7 @@ class LMTPHandlerTestCase(TestCase):  # TODO replace with less hacky test
         self.assertEqual(IssueThread.objects.all()[0].name, 'test')
         self.assertEqual(IssueThread.objects.all()[0].state, 'pending_new')
         self.assertEqual(IssueThread.objects.all()[0].assigned_to, None)
+        self.assertTrue( Email.objects.all()[2].raw_file.path)
 
     def test_handle_client_reply_2(self):
         issue_thread = IssueThread.objects.create(
@@ -281,6 +285,7 @@ class LMTPHandlerTestCase(TestCase):  # TODO replace with less hacky test
         self.assertEqual(IssueThread.objects.all()[0].name, 'test')
         self.assertEqual(IssueThread.objects.all()[0].state, 'pending_open')
         self.assertEqual(IssueThread.objects.all()[0].assigned_to, None)
+        self.assertTrue( Email.objects.all()[2].raw_file.path)
 
     def test_mail_reply(self):
         issue_thread = IssueThread.objects.create(
@@ -384,6 +389,7 @@ class LMTPHandlerTestCase(TestCase):  # TODO replace with less hacky test
         states = StateChange.objects.filter(issue_thread=IssueThread.objects.all()[0])
         self.assertEqual(1, len(states))
         self.assertEqual('pending_new', states[0].state)
+        self.assertEqual(event, IssueThread.objects.all()[0].event)
 
     def test_mail_html_body(self):
         from aiosmtpd.smtp import Envelope