Thunderbird contacts import problem

In TB I export contacts to csv UTF-8 format. I have four main colums to export / import: name, surname, display name … and e-mail. The case concerns about 5 thousands records  so the solution with export to vcf format is no option. Okey I set up columns headers from “unknown”, i.e. name, surname, display name and email. After confirmation I have Error message: Error during prepare data import. Unsupported email address". Imports only about 60 records. 
2nd way:  I set up e-mail column like: EMAIL DISPALY AS option. Thats imports all but contacts are not visible in the address book. New message->To … and no one there.