Delivery failures when sending to mail contacts in O365

Question

We are in the middle of a migration from Domino to Exchange (O365) and have updated the GAL with entries from our local active directory.  These entries include email addresses using only a few of the domains that are hosted by our Domino
environment - but not all.
People who have been migrated to Exchange receive delivery failures when replying to an email from someone who is still in Domino. 
Example:
User Bob who has been migrated to O365 gets an email from User Ann who is still in Domino.   When User Bob does a reply, User Ann's address populates with
User_Ann AT MAINDOMINODOMAIN dot com  (Please note - the @ signe was substitued with AT and the .com was substitued with dot com) because I got an error when trying to submit this. Error - Body text cannot contain images or links until we are bable
to verify your account.)
User Ann is defined in the O365 GAL as a mail contact with these email addresses:
User_Ann AT dominodomain1 dot com
User_Ann AT dominodomain2 dot com
User_Ann AT dominodomain3 dot com
User Bob gets a delivery failure.
Why?

Answer 1

Hi,
In order to resolve the problem more efficiently, I recommend you ask your question in the Exchange Online (Office 365) Forum. You might get a better answer in the Office 365 forum.
http://social.technet.microsoft.com/Forums/msonline/en-US/home?forum=onlineservicesexchange
Thanks for your kindest understanding.
Best regards,
Belinda
Belinda Ma
TechNet Community Support