Exchange 2007 users able to send emails from other accounts

I have a problem on Exchange Server 2007 running on 2008 R2 where users are able to send emails from other accounts by clicking on the from box. I have checked the permissions in exchange and user accounts as well as delegations  and made sure they are not in any admin groups. any ideas would be grateful.

Who is Participating?
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.

Mahesh SharmaCommented:
Check if everyone is given full permissions:

Get-MailboxDatabase -Identity <DB> | Get-AdPermissions
somatthiasAuthor Commented:
Have checked not a problem
Simon Butler (Sembee)ConsultantCommented:
Send As is the permission that is doing this, not full mailbox.
Somewhere they have the permission.

Check what groups have Send As permission within Exchange and then track back to see if Domain Users or something has been added to the group.


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
10 Tips to Protect Your Business from Ransomware

Did you know that ransomware is the most widespread, destructive malware in the world today? It accounts for 39% of all security breaches, with ransomware gangsters projected to make $11.5B in profits from online extortion by 2019.

Md. MojahidCommented:
You grant User B Full Access Permission for User A’s Mailbox.

Simon Butler (Sembee)ConsultantCommented:
Full mailbox doesn't grant Send As permissions.

Seth SimmonsSr. Systems AdministratorCommented:
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
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.