Whether you get your euuc.org emails from SquirrelMail, Outlook, Thunderbird, Hotmail, or somewhere else, you will need your password.
When you log into SquirrelMail, you enter your password every time, or you can set your browser to remember it. When you set up an email application, like Outlook, to receive and send your emails, you tell that application your password and the email application remembers it.
Go to http://mailboxes.euuc.org and enter your email address and password.

Enter a new password and type it again in the Confirm box. Then, click Change it! Now, click Log Out.