Here`s some useful advice given to it`s members by one of the e-mail providers about passcode security.

To create a strong password that is easy for you to remember but hard for someone else to determine, try one of these techniques:

Merge two or more words, and combine the words with numbers and symbols. For example: Walk[My]Dog, Po#34tato, Champions=1995.
Abbreviate a phrase you'll remember. It could include numbers and symbols, or words that you can substitute with numbers or symbols. For example: I ride my bike 5 miles each Saturday could become the password Irmb5meS.
Use punctuation and numbers to combine the initials of people or objects from a familiar group, such as your favorite athletes, friends, movies, books, or historical figures. For example: Gandhi, Abraham Lincoln, and Joan of Arc could become the password 1G,2AL,JA.
Drop all vowels from a favorite saying, and then add numbers or symbols. For example: Walk three dogs could become the password Wlk3Dgs.
To be strong, a password must:

Contain at least seven, but no more than 16, characters.
Combine three of the four different types of characters:
Uppercase letters (for example: A, B, C).
Lowercase letters (for example: a, b, c).
Numerals (for example: 1, 2, 3).
Symbols (` ~ ! @ # $ % ^ & * ( ) _ + - = { } | [ ] \ : " ; ' < > ? , . /).
Not be a common word or name, or a close variation.
Some service providers require that a strong password also:

Not be the same as any of your four previous passwords.
Not be a minor variation of your old password. For example, if your old password was Champions=1995, a new password of Champions=1996 would not be acceptable.
Important

Don't use one of the above examples as your password.
Don't write down your password.
Never give out your password in an instant message conversation or share it with anyone else. You should never be prompted for your password in an e-mail.
If you have more than one e-mail account, for instance, one for work and one for personal use, you should use a different password for each account.

Some great tips in that item, thanks.

Yes, it`s very important nowadays with the increasing number of scammers about. :cry: