Seems like the LegacyDN may be missing, create a x500 for the users. LegacyDNSukh

As Sukh said you need to add X500 address to fix this issue. Here are the links which can help you to understand what needs to be added Mystery of adding X500s What an amazing thing to know!!! http://msexchangeguru.com/2012/03/15/x500/ How to set X500 proxy addresses f http://support.microsoft.com/kb/313324Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Hasnain Shaikh| My blogs: http://messagingserversupport.com

Hi Please can someone help me troubleshoot this NDR that was generated when user tried to email from Ipad via Exchange Connector to internal recipients? Diagnostic information for administrators: Generating server: /O=DOMAIN/OU=First administrative group/cn=Recipients/cn=neil # #EX# /O=UNSWORTH/OU=First administrative group/cn=Recipients/cn=keiron # #EX# Reporting-MTA: dns; SERVER-SRV01 Final-recipient: RFC822; IMCEAEX-_O=DOMAIN_OU=First+20administrative+20group_cn=Recipients_cn=neil@domain.com Action: failed Status: 5.4.0 X-Display-Name: Neil S Final-recipient: RFC822; IMCEAEX-_O=DOMAIN_OU=First+20administrative+20group_cn=Recipients_cn=keiron@domain.com Action: failed Status: 5.4.0 X-Display-Name: Keiron W

Seems like the LegacyDN may be missing, create a x500 for the users. LegacyDNSukh

Hi I'm a bit confused here; Some users have the Email Address entries for x400 , e.g. C=GB;A= ;P=DOMAIN;O=Exchange;S=UserObject; but any new mailboxes created on Exchange do not have x400. Also, what is the difference between X500 and X400 Do I need to add X500 for every user in the organisation? thanks

X.400 - You don't need this if you're just using Exchange as your mail system. Check your EAP, it's probably not included in there which is the default. Not for evey user, in this case for the user who had the issue.Sukh