Exchnage 2010 Cant relay to External Mail Recipients

We have Exchange 2010 SP1, and setup a receive connector as below

Network -  Local Ip all
Remote Server -
Authentication  - None
Permissions Group - Anonymous

however, internal clients on our domain can recieve emails from the source applcaition server through our mail server and into thier mailbox,  but emails are not being sent to external email accounts.

In message tracking we dont even see exchange ackowledge emails that were specified for external users, but it does show internal.

Any Help woould be appreciated.   ( As one can guess, this is now affecting our client communications severely )

Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.


By default, "anonymous" permissions on a receive connector don't include the necessary rights to relay through the box to any sender. You need to give this right through the shell, which is in some senses deliberate to remove the risk of opening yourself up as an open relay accidentally.

In the Exchange Management Shell run the following command:
 Get-ReceiveConnector "NAME HERE" | Add-ADPermission -ExtendedRight MS-Exch-SMTP-Accept-Any-Recipient -User "NT AUTHORITY\ANONYMOUS LOGON" 

Open in new window

That will enable relay on the connector - so do be sure your security settings (such as the IP address to receive mail from) are accurate.

Also, lots of permissions are cached by Exchange so the change may not be immediate.


Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.