If you are not receiving a notification email it usually means that your host is blocking them (either as a spam prevention measure or you are exceeding the limit of how many emails you are allowed to send) or they are being caught by spam or junk filters. There are a few things you can try to get it working.
SOLUTION #1 – SET A “FROM” ADDRESS
Some hosts will block emails that have a “From” address that is not associated with the hosting account (as a spam prevention measure). To fix this, go to Forms→ Edit Form → under Email Settings tab. In the Email section at the Default “From Mail” field enter an existing email address that has the same domain as the website.
SOLUTION #2 – TRY A DIFFERENT RECIPIENT EMAIL ADDRESS
Try a different recipient email address in case there is an issue delivering to only the current email address.
If you have more than one recipient email address, try setting up the form to send to a single recipient to see if it works in that case. Some hosts may block emails with 2 or more recipients.
SOLUTION #3 – CHECK JUNK/SPAM FOLDERS
Sometimes the email may be wrongly flagged as spam. Check the Junk/Spam folder on the email account to see if the message arrived in there. If the email consistently arrives in the Junk folder, you can add the configured “From” address to your Contacts, or set up a Filter in your email software to always send the email to your inbox based on the “From” address or Subject.
SOLUTION #4 – USE AN SMTP SERVER TO SEND EMAIL
Using SMTP is a much more reliable way to send email. Use a SMTP configuration, go to Settings sidebar menu -> then choose Mailer Default option to SMTP and put your settings.
SOLUTION #5 – SET LOCAL MX RECORDS
This only applies if the domain of the site has MX records that are different from the domain itself. For example the site uses Google Apps emails and has an MX record ASPMX.L.GOOGLE.COM. When the mail server tries to deliver the email it detects that the domain is on the same server and tries to deliver locally so it will never arrive at Google. The solution is to set a local MX record (not DNS) to tell the mail server to deliver the email externally. The problem is described in more detail on Google’s help page. You should probably contact your host and ask them to set it up. There is a Bluehost specific help page here which may also apply to other hosts using cPanel. Alternatively apply Solution #4 – use an SMTP server to send email.