Internet Information Services

Published: Saturday, 16 May 2009

SMTP Mail Server


need fully-qualified hostname

If you see errors like the below

Message delivery to the host '' failed while delivering to the remote domain '' for the following reason: An SMTP protocol error occurred.
    The SMTP verb which caused the error is 'HELO'. The response from the remote server is '504 <xxxxx>: Helo command rejected: need fully-qualified hostname

Then setup your fully qualified domain name.

Administrative Tools → IIS Manager → HOST → Default SMTP → right click Properties → Delivery → Advanced → full-qualified domain name