[phoenix]

Originally Posted by Nacef

Our ISP is complaining about the fact that emails Mesage-ID is in the form of xxxxxxxx@mailserver.our-domain.com and it wants to be xxxxxxxxx@our-domain.com

You should have set that correctly during the initial install when you were asked if you wanted to change the Domain Name.

Originally Posted by Nacef

Does anyone have an idea on how to resolve that ?

You can use zmprov to rename the domain, search the wiki (link at the top of the page) or the forums for further details.