diff --git a/mail4one/pop3.py b/mail4one/pop3.py
index 0914dc9..8e33596 100644
--- a/mail4one/pop3.py
+++ b/mail4one/pop3.py
@@ -159,6 +159,7 @@ def trans_command_retr(mails: MailList, req: Request):
         write(ok("Contents follow"))
         write(get_mail(entry))
         write(end())
+        mails.delete(req.arg1)
     else:
         write(err("Not found"))