Emails not being received

Hi guys,

up until last week, we received all contact requests from the plugin.
But since this week, we no longer receive these.

http://coach-lea.be/contacteer-me/

I checked to FAQ and tried to find the issue in Office 365, SPAM and others.

Can you please help us troubleshoot?

Thx.

https://wordpress.org/plugins/contact-form-7/