I advice against tutanota. I was surpised to learn that they try to scam customers into paying for longer than was intended.

They refuse to accept cancellations of their paid premium services for when the paid for duration ends.

They insist you to login the day the duration ends to switch to the free mode. If you miss the date (by not much), they say they'll cancel and reimburse you.

The intent of this scam is clear, they hope you miss the date and pay for one more year. However, they have absolutely no legal standing in refusing the cancellation.

I'm engaged with customer protection organisations against this scam by tutanota.