Merge remote-tracking branch 'paperless/dev' into feature-consume-eml

src/paperless_mail/models.py

@@ -183,11 +183,9 @@ class MailRule(models.Model):
         default=TitleSource.FROM_SUBJECT,
     )
 
-    assign_tag = models.ForeignKey(
+    assign_tags = models.ManyToManyField(
         document_models.Tag,
-        null=True,
         blank=True,
-        on_delete=models.SET_NULL,
         verbose_name=_("assign this tag"),
     )