Forum Discussion

Copper Contributor

Oct 27, 2019

Solved

Invalid characters in UPN and email address

Hi, Quite a large number of mailboxes are not sync to Cloud because special characters are not supported in Office 365. Is invalid character support in: - public folders where email address has...

Andy David
Oct 27, 2019
NodorinaMing

You'll need to clean that up or prevent the sync of those objects by filtering in AADConnect

here is some info on what is allowed:

https://docs.microsoft.com/en-us/office365/enterprise/prepare-for-directory-synchronization?redirect...

and the tool that can help identify and fix these:

https://docs.microsoft.com/en-us/office365/enterprise/prepare-directory-attributes-for-synch-with-id...

CloudHal

Iron Contributor

Oct 30, 2019

I did quite a bit of testing on this, there are some nuances and you can add back addresses with special characters as a secondary alias and that will work. See https://cloudrun.co.uk/exchange-online/special-characters-in-upn-and-email-addresses-in-office-365-migrations/ for more info.

NodorinaMing
Copper Contributor
Nov 20, 2019
Hi,

REF to https://cloudrun.co.uk/exchange-online/special-characters-in-upn-and-email-addresses-in-office-365-migrations/
I have removed invalid characters from all email addresses (not display name). However the mailbox is still not sync to Office 365.

Getting NDR:
Reported error:
550 5.1.10 RESOLVER.ADR.RecipientNotFound; Recipient avc.dec@companny.xxx not found by SMTP address lookup
DSN generated by:
ME2Pxxxxxxx98.ausprd01.prod.outlook.com