diff --git a/src/config.rs b/src/config.rs
index c4457478..445e6b51 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -1159,7 +1159,7 @@ fn validate_config(cfg: &ConfigItems, on_update: bool) -> Result<(), Error> {
                     #[cfg(unix)]
                     {
                         use std::os::unix::fs::PermissionsExt;
-                        if !metadata.permissions().mode() & 0o111 != 0 {
+                        if metadata.permissions().mode() & 0o111 == 0 {
                             err!(format!("sendmail command at `{path:?}` isn't executable"));
                         }
                     }