Migrating from virtualmin

[SirTux]

Hello everyone!

Im trying to figure out how to migrate 4 domains i have runing in a virtualmin server using devcot as mail server. what would be the easiest way to migrate this mailboxes from my virtualmin server to plesk. im not worried abt usernames and passwords since they total only 20 emails but my consern is their mailboxes since they use only webmail and no clients.

thank you in advance

Ardi