Disable Plesk 7.6 mail password requirements

[Daniel Clements]

While setting up mail accounts I got the following error -

Error:Unable to set password:
The password is incorrect, use from 4 up to 14 characters.The password should not contain mail name as its part.


We are migrating users from other web sites to our server and many their passwords have been set up to contain their usernmae. My boss wants me to disable requirements so that the users can still use their passwords. I'm wondering if this can be done and how to do it.

Thanks