The email has been received locally, but I couldn't read it through POP3 / imap？

Maillog doesn’t show any errors. I see a new email in my / home / mail / domain / user / new. I just can’t read the email by using the client or telnet 110 / 143. Dovecot info The log doesn’t seem to show any errors. I don’t know what to do. Everything shows that there seems to be no problem.dovecot.conf have some configurations： mail_location = maildir:/home/mail/%u/ userdb { driver = sql args = /etc/dovecot/dovecot-sql.conf } dovecot-sql.conf have some configurations： user_query = SELECT ‘/home/mail/’ || maildir AS home, 200 as uid, 12 as gid FROM mailbox WHERE username = ‘%u’ AND active = ‘1’ Other configurations should be irrelevant.Can anyone help me, because all the information seems to indicate that they are normal, but I can’t get the expected results.Thanks.