diff --git a/apps/pr-reviewer/fixtures/demo-pr/email.ts b/apps/pr-reviewer/fixtures/demo-pr/email.ts
index 9867fe5..150b187 100644
--- a/apps/pr-reviewer/fixtures/demo-pr/email.ts
+++ b/apps/pr-reviewer/fixtures/demo-pr/email.ts
@@ -1,3 +1,3 @@
 export function isEmail(value: string): boolean {
-  return value.includes("@");
+  return /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(value);
 }