email not working

WP – 4.2.2

Job Manager – 0.7.23

website – http://www.mhhcsa.com

http://www.mhhcsa.com/application is direct link. I tested several applications and none of them went to the default email. I changed the email address several times and same result.

Help please.

https://ww.wp.xz.cn/plugins/job-manager/