diff --git a/nixos/modules/services/mail/dovecot.nix b/nixos/modules/services/mail/dovecot.nix
index 11e8b26c75e..333a03315bc 100644
--- a/nixos/modules/services/mail/dovecot.nix
+++ b/nixos/modules/services/mail/dovecot.nix
@@ -13,6 +13,7 @@ let
     ''
       base_dir = ${baseDir}
       protocols = ${concatStringsSep " " cfg.protocols}
+      sendmail_path = /var/setuid-wrappers/sendmail
     ''
 
     (if isNull cfg.sslServerCert then ''