PHP Imap证书失败

I was pulling my inboxes using php-imap/php-imap library and inboxes managed by CPanel. All in sudden script stopped with following error.

Connection error: Certificate failure for imap.domain.com: 
Server name does not match certificate: 
/OU=Domain Control Validated/OU=PositiveSSL/CN=<amazon.domain.com>

in /.../vendor/php-imap/php-imap/src/PhpImap/Mailbox.php

here is the imap path I am using: {imap.domain.com:143/imap/tls}INBOX

I also tried {imap.domain.com:143/novalidate-cert/imap/tls}INBOX but all in vain.

What change could have have stopped it?
How to fix it and avoid such failure in future?

IMAP port is 993..143 for POP..Try it..

{imap.domain.com:993/imap/ssl/novalidate-cert}INBOX