diff --git a/libs/checker.js b/libs/checker.js
index acc0909..0160782 100644
--- a/libs/checker.js
+++ b/libs/checker.js
@@ -44,7 +44,7 @@ checker.isChinese = function (content) {
  * @param {string} content
  */
 checker.isEmail = function (content) {
-  return /^[\w-_]+@[\w-_]+(?:\.\w+)+$/.test(content)
+  return /^[a-z0-9ก-๛\-]+@[ก-๛a-z][ก-๛a-z0-9\+\-\.]*[ก-๛a-z]{2,}$/.test(content)
 }
 
 /**
diff --git a/test/checker/test.isEmail.js b/test/checker/test.isEmail.js
index d141385..6fe4247 100644
--- a/test/checker/test.isEmail.js
+++ b/test/checker/test.isEmail.js
@@ -3,6 +3,10 @@ const checker = require('../../libs/checker')
 const assert = require('assert')
 
 test('邮箱验证', t => {
+  assert(checker.isEmail('email-test@universal-acceptance-test.international') === true)
+  assert(checker.isEmail('email-test@universal-acceptance-test.icu') === true)
+  assert(checker.isEmail('อีเมลทดสอบ@ยูเอทดสอบ.ไทย') === true)
+  assert(checker.isEmail('อีเมลทดสอบ@ทีเอชนิค.องค์กร.ไทย') === true)
   assert(checker.isEmail('511363759@qq.com') === true)
   assert(checker.isEmail('kelvv@outlook.com') === true)
   assert(checker.isEmail('xxxxÄxx@xxx-xxx.com.hk') === false)