Outlook Exchange Server email validation

If I enter a never used email address in the TO field in outlook it does some kind of validation I suspect then puts an underline under the email address if it's good.  If it's bad I get a dialog box that says Check Names - Microsoft Outlook does not recognize "email address" - I then have the ability to Show More Names.  

The problem is it takes FOREVER to pop up that dialog box or tell me its a bad address.  I'm wondering what the process is that Outlook/Exchange server uses to check these email addresses.  It started doing this about 4 months ago so my hunch is something was done on the exchange server to cause this.

Outlook 2010

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Simon Butler (Sembee)ConsultantCommented:
That comes off tool tips if I remember correctly, which is driven by web services, which is found by Autodiscover.
Therefore check that your Autodiscover settings are correct, the URLs on the EWS virtual directories are valid and the SSL certificate is valid.

Peter HutchisonSenior Network Systems SpecialistCommented:
If using Exchange, then it will check the address with the Global Address List which is is basically looking at your AD/Exchange mail/mailbox enabled accounts. It will also check your your local Contacts for a match. You can tell Outlook to check the GAL or Contacts first.
The GAL is referred to by the Microsoft Exchange ADdress Book Service on a CAS server. It also uses a NSPI (Name Server Provider Interface) which checks the Global Catalog on your DCs.
So, to troubleshoot, make sure you have enough Global Calalog servers enabled on your DCs and the Address book service is running ok on the Exchange CAS servers.
What's slowing it down may not be due to email address validation but Outlook Auto Resolve & AutoComplete.  Have you tried to turning oft the autocomplete to see if it helps?

If so, then you may have too large autocomplete cache file *.n2k and or that it's corrupt.  Either way will require you to clear it (if this was the case).

Here is how to turn off the autocomplete: https://support.office.com/en-us/article/Turn-on-or-off-Auto-Complete-List-name-suggestions-7899a2b1-5fbb-486c-b27e-91909a1064f0?ui=en-US&rs=en-US&ad=US

Can you disable it for testing and see if it improves the dialog box response time?

Please give that a test
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keschusterAuthor Commented:
Thanks for all the checks - so you know I'm limited to only doing things on Outlook - no access to exchange.  

I don't know if this tell you guys anything.  If I enter something like "casco, bill" - and is not in the company address book - this triggers the LONG stall until the Check Names comes up
Sounds like it's trying to find a match against the autocomplete cache or address book rather than email address validation.  Please try disabling the autocomplete first in your Outlook.

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keschusterAuthor Commented:
I think it was microsoft dynamics.. I uninstalled and it works instantly as it used to
You mean the CRM plug in?  I know MS CRM is buggy.  Glad you figured it out.
keschusterAuthor Commented:
yeah the plug-in.  It may not have been configured correctly - I kept getting certificate errors/notification.  I can't say that was CRM related but uninstalling the plug has it working correctly again - thanks!
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