Mail delivered to wrong address

I have a domino setup with 3 different domain and 3 different address book with Directory Assistant in place. (ex. john@abc.com, david@xyz.com, paul@def.com)

I have some issue in the address lookup. Whenever the user sent mail from WEBMAIL to david@yahoo.com, it will end up to david@xyz.com

NOTE: If the user using the NOTES CLIENT to send the mail everything is working fine.

Already put the “Fullname only” under the “address lookup” field for all the server.

Previously the problem was existing for both WEBMAIL and NOTES CLIENT users, but after change the “Fullname only” under the “address lookup” field for SMTP server it solved for the NOTES CLIENT user.

Any other setting that needs to be modify? Thanks in advance for any inputs.