Hi,This happened to me once. Emails were not in the respective inbox
though the delivery status says 'SENT'. I have then white listed the
domain and it worked.Go to Administration > Campaign Management Non
Deliverables Management > Mail rule sets > Domain ManagementAdd your
domain (xyz.com/gmail.com) and ask Adobe support team to restart the MTA
to finish the whitelisting process.You should then be receiving the
emails in the inbox.Please let me know, if this worked.