Recipient user name not unique.

We have two user accounts with same LastName and different FirstName,  ShortName and MailFile under Lotus Notes Domino. When we attempt to send mail to one of users we have error message 'Recipient user name  not unique. Several matches found in Name & Address Book.' Any hints are welcome.
dengAsked:
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ghassan99Commented:
in the NAB and under the SMTPMTA section, enable 'internet address lookup'
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