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Your message to IMCEAEX- couldn't be delivered. Your mail program is using out-of-date address information for IMCEAEX- PRYSBYM Office 365 IMCEAEX-_o=MIGOV_ou-. . . Action Required Recipient Out-of-date TO address How to Fix It To stop your mail program from using out-of-date address information, clear the recipient nickname cache in Outlook or Outlook Web App by doing the following: Click New mail (or New Email). In the To box, start typing the recipient's name or email address until the recipient appears in the drop-down list. Use the Down Arrow and Up Arrow keys to select the recipient, then press the Delete key. Resend your message - delete and retype the recipient's name or email address before sending it. If the problem continues, forward this message to your email admin. Was this helpful? Send feedback. More Info for Email Admins The recipient email address is a LegacyExchangeDN address, which isn't used by the Office 365 service. You might see this error if you've migrated from on-premises to the cloud, or if your organization has a hybrid configuration and you synchronize your on-premises directory with Office 365. If clearing the recipient nickname cache from the user's Outlook or Outlook Web App program doesn't solve the problem, try to clear the related LegacyExchangeDN address from your on-premises Active Directory by using the LegacyExchangeDN Utility. Then re-synch the directory. For more information, see Error code 5.1.11 in Exchange Online and Office 365. Original Message Details Created Date:9/25/2015 12:29:46 PM xxxEND_PAGE:deq16_b5_0892_4900_1002 Sender Recipient Address:IMCEAEX-