How do I Import email zips to multiple accounts through mail.admin

How do I Import email zips to multiple accounts through mail.admin

Long story short... 

Moving from zoho.com server to zoho.eu

Have 4 different zip files for four different users. Want to use mailadmin to allocate the zips to each account without having to go into each user account and import. 

Must be a way of doing this as Zoho are pitching themselves to big companies.