Toujours utile : By default Exchange 2007 is configured to only accept SMTP email for domains it is authoritative for, and will only relay email onto other domains for authenticated local users. Usually for Outlook/OWA based clients this is entirely sufficient...

http://technet.microsoft.com/en-us/library/bb232021.aspx http://blogs.techrepublic.com.com/networking/?p=373 Attention a utiliser avec parcimonie! Par défaut Exchange 2007 n'autorise pas le relais, ce qui est bien... mais certains serveurs ont besoin...