The problem may occur when you are using field Form will be sent from this Email in form configuration in builder. For example you use address in this field [email protected]. Then mails may not be received on your email account due to the fact that domain mysite.com does not have DNS record of type SP. Due to this mails can be blocked by mail servers. If you are an owner of domain “mysite.com” you need to add SPF record in DNS configuration of your domain.
When you do not have field “Form will be sent from this Email” filled in then the address [email protected] is used (where “mysite.com” is replaced with your website domain name). In this case the reason of not receiving mails is the same as described above.