Could you let us know the version of Event Espresso that you are using?
You can find this information in your WP plugins screen within your WP dashboard.
Also, what steps did you already try?
If this was working previously and recently stopped working, then their may be a change with the local email server. We recommend that members use a transactional email service like Sendgrid or Postmark app to help with email issues:
The support post ‘Email confirmations are not being sent out’ is closed to new replies.
Have a question about this support post? Create a new support post in our support forums and include a link to this existing support post so we can help you.
If you would like help from the Event Espresso staff, then please purchase a support license right now so you can create a support topic in our premium support forums.