I saw interesting issue today.. where External user(From Internet from Lotus notes) sent an email to one groupmailbox and few recipients. When i tracked in Boundary system(Ironport) it delivered correctly and when i tracked in Exchange 2010 it shows correctly, even the Deliver event shows separate address as A.eroomsupport@test.com and abhishek_agarwal@a.com. But when it reaches Mailbox of user it shown as"A.eRoomSupport@test.com>, abhishek_agarwal"@a.com)where A.eroomsupport@test.com is a group mailbox and abhishek_agarwal@a.com is a separate address.
This is not only for one user but same in for all the recipients. When recipients "reply all" we are getting bounced NDR.
Our environment has :
Exchange 2010 SP3 RU3, Cisco Ironport and mail was sent from Lotus notes. outlook 2013, 2010 and webapp as well.
Any help is appreciated!!!
Regards, Bhoopat.