contact form stopped sending email

how do I get help when contact form stopped sending email.
says it has sent. it is complete theme with contact form 7 plugin that says:
This e-mail was sent from a contact form on Minimal (http://totaltheme.wpengine.com/base)

Hello,

You have to get in touch with expert who can solved your issue
Envato Studio Experts hope your issue will be solved.

Thanks!