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

The first place I would look would be in Exchange System Manager. If you drill down to the server, Protocols, SMTP, Default SMTP Virtual Server, Right Click, Properties, Delivery, Advanced Button. In there you should see your Fully-qualified domain name listed. "servername.domain.extension". If the FQDN is not listed, correct it and click on the "Check DNS" button. Also, here are a couple of Microsoft articles showing you how to change other information the banner contains. http://support.microsoft.com/kb/281224/ http://support.microsoft.com/kb/836564/en-us John G.

Another option is to use your firewall SMTP proxy to change the header and Message ID host information. Most medium to enterprise class firewalls can do it Thanks