Problems in ERE contact forms

Hi. I am testing your ERE plugin on my test platform and at the moment everything is quite good. but I have noticed that I do not receive any email from the login, register or agent forms. I have them configured to be sent to an IMAP email and I really do not receive anything. however, if I modify a gmail email, for example, the reception of messages is instantaneous. What is the reason for this? Thank you. I am looking forward to your response.