Exhange 2010 question

I have a distribution group that has 1500 users in it, but when I go to send an email to that group it says there are only 350 users. I am using Outlook 2010 and Exchange 2010. I get the message This e-mail message will be sent to 350 recipients. Any idea why it says that?
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.

Scott CSenior EngineerCommented:
The list is too large.


The size of the list cannot exceed 29k.

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
atlbearcatAuthor Commented:
Not the same error message as it only has 1500 users, not 29,000. It does not say the list is too large, it simply is not calculating the correct amount of recipients in Outlook 2010. It says this e-mail message will be sent to 337 recipients, when it should say 1506.
Scott CSenior EngineerCommented:
Sorry no.  It's not 29,000 users.  It's the actual size of the list.  Longer email addresses will take up more room.
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.