Yes, at the moment we are offering all BlueBird Private Email packages as free trails.
All BlueBird Private Email plans have 90 days free trail period. It is possible to order a 60 days' free subscription for Private plan only once for the lifetime of a domain and for other plans only once per users account.
Trail subscriptions are not limited in functionality, except the file storage (firestore quote for all trail email packages is 200 MB).
Purchases of additional mailboxes (trial version come with one) and renewals are considered as upgrades to paid versions of BlueBird Private Email subscriptions.