Internet Information Services
SMTP Mail Server
Section titled “SMTP Mail Server”Troubleshooting
Section titled “Troubleshooting”need fully-qualified hostname
Section titled “need fully-qualified hostname”If you see errors like the below
Message delivery to the host 'xxx.xxx.xxx.xxx' failed while delivering to the remote domain 'terra.com.pe' 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 hostnameThen setup your fully qualified domain name.
Administrative Tools → IIS Manager → HOST → Default SMTP → right click Properties → Delivery → Advanced → full-qualified domain name