Kerberos certificate issue using ssl

When I tried this module against and Exchange server using username password and SSL, it still requires a valid kerberos certificate. Without one an error appears and no nodes are imported. IMAP error in close_mailbox: Kerberos error: Credentials cache file '/tmp/krb5cc_48' not found (try running kinit).....

I don't want to recompile PHP without Kerberos support or keep having to generate tickets for the apache user on my server.

I was able to fix it by changing line 132 of mailhandler/modules/mailhandler_php_imap/plugins/mailhandler/retrieve/MailHandlerPhpImapRetrieve.class.php to
$result = imap_open($box, $name, $pass, NULL, 1, array("DISABLE_AUTHENTICATOR" => "GSSAPI"));

Adding array("DISABLE_AUTHENTICATOR" => "GSSAPI") when /ssl is included in the Extra commands section of the Mailhandler mailbox connection settings would appear to be required.