Hi Sir,I am getting outbound mail blocked and end up on blacklists. A helo check returns this message. There was a SMTP communication problem with the recipient's email server. Please contact your system administrator. <mail.domain.com #5.5.0 smtp;550-Your HELO name for IP address xx.xx.xx.xx was>CBL further informs me that my mail server is sending from "localhost" instaed of FQDN for my mail server.. How do I fix this?This is an Exchange 2003 SP2Thanks,Nelson __________________Kindly appreciate for your good advice urgently.With Thanks & Best Regards,Nelson nelson@itsupport.sgthanhtike@gmail.com