User names are valid with a length between 3 and 100 characters. Letters, numbers and spaces are allowed. Additionally you can use the following characters: ! $ % & / ( ) { } [ ] ? @ * ~ # , . - ; _

Every e-Mail address between 5 and 255 characters will be accepted by the system if the address or domain has not been blocked by the administration. Please note that only one account is allowed per e-Mail address.

The administration defined a minimal length of 6 characters for the password. The more characters you use, the more secure is your password. We recommend additionally to mix numbers and special characters with your password and not to use your user name or any part of your e-Mail address.