Outlook 2003 / Exchange 2003 - sending single calender invite and gets error message from System Administrator about uknown users that do not have been sent invite to

techagikt
techagikt used Ask the Experts™
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When a user send a calender invite to one spesific person in the locale domain the user gets an error email from System Administrator about undeliverable to many users that don't have been send an invite to.....
When sending calender invite to other persons in the organisation everything is ok.

The email from System Administrator contains:

Your message did not reach some or all of the intended recipients.

The following recipient(s) could not be reached:

      "username" on 17.04.2012 16:01
            The e-mail account does not exist at the organization this message was sent to.  Check the e-mail address, or contact the recipient directly to find out the correct address.
            <xxxx.com #5.1.1>

"username2" on 17.04.2012 16:01
            The e-mail account does not exist at the organization this message was sent to.  Check the e-mail address, or contact the recipient directly to find out the correct address.
            <xxxxx.com #5.1.1>

      "username3" on 17.04.2012 16:01
            The e-mail account does not exist at the organization this message was sent to.  Check the e-mail address, or contact the recipient directly to find out the correct address.
            <xxxxx.com #5.1.1>
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Raymond PengSystems Engineer

Commented:
Are you sending it to one person and you receive these errors or are you sending the email to a Distribution List?

If it's a DL, remove the offending users from the DL.

Per the error messages, do those recipients have valid AD / Mailbox accounts?

Author

Commented:
Sending it to only one user and are getting error message in return for multiple users that we are not sending the invite to.
This was an issue with Delegation - delegated users were recieving a copy of calendar invites.

Author

Commented:
found answer elsewhere.

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