diff --git a/plinth/modules/email_server/aliases/models.py b/plinth/modules/email_server/aliases/models.py
index 18d22f906..a38d33e4e 100644
--- a/plinth/modules/email_server/aliases/models.py
+++ b/plinth/modules/email_server/aliases/models.py
@@ -1,7 +1,5 @@
 from dataclasses import InitVar, dataclass, field
 
-email_positive_pattern = re.compile('^[a-zA-Z0-9-_\\.]+')
-
 
 @dataclass
 class Alias: