Why is this safe?

By giving us your email address and password, Mailshell can fetch your messages and use our advanced spam filtering technology to clean spam from that account. This information will not be used for any other purpose. (Please note that messages will be removed from the server after they are successfully retrieved.)

Mailshell has strict security measures in place to protect the loss, misuse, and alteration of the information under our control. We take extensive precautions--including among our employees--to prevent the loss, misuse, or alteration of users' personal information.