Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

Professional Opinions
Ask a Question
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE

troubleshooting Question

Error 5.7.1 when sending mail thru Exchange 2007

Avatar of Lev Kaytsner
Lev Kaytsner asked on
ExchangeEmail ProtocolsMicrosoft Applications
2 Comments1 Solution1837 ViewsLast Modified:
I have an Exchange 2007 SP1. Another application on my network is trying to send notification messages using this Exchange server. When message is sent following error message comes back:

"mailbox unavailable. The server response was: 5.7.1 Client does not have persmissions to send as this sender".

I also have Exchange 2003 server and when I set up SMTP connector to allow relay from this server, it works fine. In Exchange 2007, I've looked at Receive Connector, but thus far could not find a solution.
Avatar of coolsport00
This problem has been solved!
Unlock 1 Answer and 2 Comments.
See Answers