Two-factor authentication is a must for a secure email service to make sure that no one can take over your private email account. Tutanota now supports authentication apps and hardware tokens for 2FA to protect your encrypted mailbox.
Newsletter email bombs are attacks on an email address that send thousands of newsletter sign-ups to a mailbox, rendering this mailbox useless. Email bombs are very easy to execute as all the attacker needs is a webcrawler and the targeted email address. Tutanota has now developed a fix against email bombs.