Event ID - 236

Event Id236
SourceMSExchangeDSImp
DescriptionUnable 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.
Event InformationAccording to Microsoft:
CAUSE:
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.
RESOLUTION:
Edit the .csv file and change the duplicate e-mail address for the specified custom recipient. Try the directory import operation again.
Reference LinksXADM: Importing Custom Recipient Logs Event ID 236

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