[vchkpw] How can I get rid off the below message which was send as gif file ?

How can I get rid off the below message which was sent as gif file ?  

[vchkpw] How can I have my mail server checked whether helo address of sender mail servers has fully-qualified domain name or not ?

Hello   I use vpopmail5.4   I want my qmail-server to check whether helo address of sender smtp servers who send mails to my mail server is fully-qualified domain name or not. How can I do that as tcp.smtp file or qmail-smtpd file other method?    Thanks