Here is an example of adding an extra field smtp for creating a proxyAddress that is needed in the target but doesn't exist in the source.
WARNING: Ensure that this is tested before use in production environments for all objects. The Template's default value is for a Local to Local environment, it will merge Source and Target Proxyaddresses into the target object.
GetProxyAddresses(S.proxyAddresses, T.proxyAddresses, prefix(Result("mail"), "SMTP:"), prefix(legacyExchangeDN, "x500:"), prefix(Result("legacyExchangeDN"), "x500:"))
In adding an entry as smtp can be added to the above script. Added is taking the EmployeeID and adding the @domain.com and prepending the smtp:
GetProxyAddresses(S.proxyAddresses, T.proxyAddresses, prefix(Result("mail"), "SMTP:"), prefix(s.employeeID + "@domain.com", "smtp:"), prefix(legacyExchangeDN, "x500:"), prefix(Result("legacyExchangeDN"), "x500:"))
