Email Data Migration - fundamentals - users passwords?

Email Data Migration - fundamentals - users passwords?

I am trying to migrate my small company's dependency on a cpanel-type solution to diverse hosting services... I am migrating just emails to Zoho. I have already created the user accounts in Zoho that match with my user accounts on source provider. I  believe that IMAP migration type would be best fit for my case.


According to this step in the IMAP migration guide article, I don't understand how I can migrate my users' mailboxes unless I (the IT Admin) know of all their passwords and bulk import them... Could someone please share a bit more insight about the right practice?  Appreciate very much