HI,I am highly apprishate if some one can help me to understand Authoritative Domain and relay domains ?Regards

Hi,Here you can find my explanation:http://social.technet.microsoft.com/Forums/en-US/exchangesvrantivirusandantispam/thread/fd516695-b15e-4fff-9950-7cf452361cfdRegards,Zoltnhttp://www.clamagent.org - Free Antivirus for Exchange http://www.it-pro.hu http://emaildetektiv.hu

In short, Authoritative domains are responsible for the mailboxes which are hosted in Exchange organization and Internal/External Relay domains are configured to relay emails for externally hosted domain with email addresses and mailboxes.... Further detailed information can be found in below article... Managing Accepted Domains http://technet.microsoft.com/en-us/library/bb124423.aspxAmit Tank | MVP Exchange Server | MCITP: EMA | MCSA: M | http://ExchangeShare.WordPress.com

HiThanks for the reply.Amit can u explane using Examples.Regards

Authoritative domains are configured when you have mailboxes which are accepting with other than your own smtp domain, let's say contoso.com is your own domain with AD but your mailboxes are also accepting mails for fourthcoffee.com also then you have to add it into accepted authoritative domain.About Internal and External Relay, you can find good examples inside the article with figure, which I mentioned in previous response... :) Amit Tank | MVP Exchange Server | MCITP: EMA | MCSA: M | http://ExchangeShare.WordPress.com

Ok, here is a real example of authoritative domain, when to configure and how, while receiving mails for multiple domains to the mailboxes which are hosted in your Exchange environment. http://social.technet.microsoft.com/Forums/en-US/exchangesvrdeploy/thread/06c722c0-5040-488d-bbed-6a77ec9af54fAmit Tank | MVP Exchange Server | MCITP: EMA | MCSA: M | http://ExchangeShare.WordPress.com