Inbox in Android

I have a problem with inbox in Android. I cannot receive incoming emails but I can send emails. I have used IMAP configuration. I have checked IMAP is enable and this is my configuration:

      Incoming Server Name: imap.zoho.com
      Port: 993
      Require SSL: Yes

      Outgoing Server Name: smtp.zoho.com
      Port: 465, SSL
      Require Authentication: Yes

We can finalize the configuration without problems and without error messages, but inbox mails doesn't appear.