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path: root/service/pixelated/adapter/services/mail_service.py
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-rw-r--r--service/pixelated/adapter/services/mail_service.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/service/pixelated/adapter/services/mail_service.py b/service/pixelated/adapter/services/mail_service.py
index 789d159e..d9cb6517 100644
--- a/service/pixelated/adapter/services/mail_service.py
+++ b/service/pixelated/adapter/services/mail_service.py
@@ -51,7 +51,7 @@ class MailService(object):
raise ValueError('None of the following words can be used as tags: ' + ' '.join(reserved_words))
new_tags = self._favor_existing_tags_casing(new_tags)
mail = yield self.mail(mail_id)
- mail.tags |= set(new_tags)
+ mail.tags = set(new_tags)
yield self.mail_store.update_mail(mail)
defer.returnValue(mail)