Vivaldi apart of the inbuild mail client also offers an an free e-mail direction to the user (after reaching a certain reputation, to avoid spam) as also an free blog for your own use with your account, the account is also valid to participate in the Vivaldi Mastodon instance, apart of the forum, also to sync your data with an extra encryption password, stored locally !!!if yo lose or forget it, you lose your synced data!!! no encryption password recovering possible. The price of privacy