If your site supports it you may sign on to BlitzMail using a system called Kerberos. Kerberos, named after the three-headed guard dog of Greek mythology, is a system of software developed at MIT to improve the security of computers used across networks.
Tickets have a number of advantages over conventional passwords.
They are specific to a particular time, computer, and service, so if they are intercepted they are much less useful than a password since the password can be used at any time, from any computer, for any purpose. Kerberos is implemented in such a way that the user can type her password once, and for a certain period of time any program on that computer can obtain a ticket without bothering the user. This feature can make Kerberos more convenient, as it removes the need to type the same password for a number of different services. Once BlitzMail signs on with a Kerberos ticket it will continue to use tickets for all authentication tasks, until the user signs off. If BlitzMail needs to prove the user's identity to a server and no ticket is available, BlitzMail prompts the KClient software to ask to the user to enter her password and produce a new ticket.