8 Jul 2008

550 The host name specified in HELO does not match IP address

by | posted in: Tech | 0
Exchange System Manager,
Servers,
<your server>,
Protocols,
SMTP.
Right click on the default SMTP VS and choose Properties.
Click on the tab Delivery and then Advanced.
Change the FQDN to match what your external DNS and reverse DNS record says
mail.domain.com for example.