The Vivaldi web browser has been offering email addresses for about a year now, but I had never tried creating one before. So when the last updated version of Vivaldi browser (version 1.14.1077.41) was released, I claimed one for myself. These email addresses use the vivaldi.net domain and support IMAP or POP3 protocols so that you can use them inside any of your favorite email clients like Mozilla Thunderbird.
But after creating a new Vivaldi email address when you try to access it from the webmail interface (https://webmail.vivaldi.net/), it throws up an error – “Product license is invalid”. No matter what you do it keeps showing this error.
There is a very simple workaround for this problem. Either you configure your favorite email client (e.g Thunderbird) to access the Vivaldi email account, or you can just visit https://mail.vivaldi.net/webmail/ in your Vivaldi web browser to access the email account. The interface is a little different, but all you have to do is enter your username and password in order to login and access your email messages.
The webmail interface that opens up is very similar to the webmail interfaces provided by some of the web hosting service provides. In other words, it is very minimal and does not give you any of the advanced features like the ones offered by email giants Gmail or Yahoo Mail. But you can send or receive email messages among some other basic options.
The “Product license is invalid” error has been around for Vivaldi webmail interface for a long time. When will Vivaldi developers fix this issue stays unknown. But my guess is that they have been providing the Vivaldi email addresses mainly to be used from inside the various email clients and this is why they are not really bothering to fix this bug from the Vivaldi webmail interface.