diff --git a/nix/os/containers/mailserver.nix b/nix/os/containers/mailserver.nix
index 4fa7c1c..532dca3 100644
--- a/nix/os/containers/mailserver.nix
+++ b/nix/os/containers/mailserver.nix
@@ -45,6 +45,10 @@ in args // {
           postmaster_address = "mail@stefanjunker.de"
           mail_plugins = $mail_plugins sieve
         }
+
+        protocol imap {
+          mail_max_userip_connections = 64
+        }
       '';
 
     };