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Event ID: 236 Source: MSExchangeDSImp

Level
Description
Unable to process custom recipient <name of custom recipient> because target address SMTP:(user@company_name.com) has already been assigned to Address Book entry /o=DomainName/ou=Site/cn=Recipients/cn=user.
Comments
 
As per Microsoft: "This problem occurs if you are importing a custom recipient that has an SMTP alias that already exists. When the same address already exists for the user you are importing, you cannot import the custom recipient". See ME232618 for more details.

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