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?
atlbearcatAsked:
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Scott CSenior EngineerCommented:
The list is too large.

https://support.microsoft.com/en-us/kb/238569

The size of the list cannot exceed 29k.
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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.
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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.
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