[Improvement-3720][ui] js mailbox verification fix

dolphinscheduler-ui/src/js/conf/home/pages/projects/pages/definition/pages/list/_source/util.js

@@ -37,7 +37,7 @@ const warningTypeList = [
 ]
 
 const isEmial = (val) => {
-  let regEmail = /^([a-zA-Z0-9]+[_|\-|\.]?)*[a-zA-Z0-9]+@([a-zA-Z0-9]+[_|\-|\.]?)*[a-zA-Z0-9]+\.[a-zA-Z]{2,3}$/ // eslint-disable-line
+  let regEmail = /^([a-zA-Z0-9]+[_|\-|\.]?)*[a-zA-Z0-9]+@([a-zA-Z0-9]+[_|\-|\.]?)*[a-zA-Z0-9]+\.[a-zA-Z]{2,}$/ // eslint-disable-line
   return regEmail.test(val)
 }