Yes,Yahoo!7 Mail sets a cookie when you sign in to your Yahoo!7 Mail account. A cookie is a small piece of information stored by your browser to help identify you.

How Yahoo!7 Mail uses cookies:

• We use cookies to keep you signed in as you move from page to page.
• The cookie automatically expires after eight hours.
• During that time, if you don't sign out or exit the browser, clicking any Yahoo!7 Mail icon will automatically take you into your account—so you don't have to sign in repeatedly.
• If you're prompted to accept a cookie after signing in to Yahoo!7 Mail, the only way to access your account is to accept the cookie.
• Declining the cookie either causes your sign in session to expire, or it might temporarily disable your account.
• If your browser is configured to reject all cookies automatically, you won't be able to sign in to Yahoo!7 Mail. Instead, you'll see a page entitled, "An Error Occurred Setting Your User Cookie."

To use Yahoo!7 Mail you'll need to configure your browser to enable or accept cookies.

Click the link for your browser for instructions on how to configure your browser to accept cookies:

• Internet Explorer 6.0 and 7.0 (Windows)
• Internet Explorer 8.0 (Windows)
• Internet Explorer 9.0 (Windows)
• Firefox 2.0.0.1 and newer
• Safari 2.x and newer
• Google Chrome
• Other browsers

Internet Explorer 6.0 and 7.0 (Windows):

1. Select the Tools menu | select Internet Options.
2. Select the Privacy tab.
3. Set the security level set to Medium or Medium-Low.
4. Click OK.
5. Close and restart your browser.

Internet Explorer 8.0 (Windows):

1. Select the Tools menu | select Internet Options.
2. Under "Browsing History" | click Delete.
3. Check the Temporary Internet Files, Cookies, and History checkboxes.
4. Click the OK.
5. Close and restart your browser.

Internet Explorer 9.0 (Windows):

1. Select the Tools menu | select Internet Options.
2. Under "Browsing History" | click Delete.
3. Check the Temporary Internet Files and Cookies checkboxes.
4. Click Delete.
   
   Note: This is located to the left of the "Cancel" button, which is highlighted by default.
5. Close and restart your browser.

Firefox 2.0.0.1 and newer:

1. Select the Tools menu | select Options.
2. Select the Privacy icon at the top.
3. Ensure the Accept cookies from sites checkbox is selected.
4. Ensure that no Yahoo!7 sites are listed under the "Exceptions" button.
5. Click OK.

Safari 2.x and newer:

1. Select the Tools menu icon (gear symbol) at the top-right | select Preferences.
2. Select the Security tab.
3. Select the cookies option, Always.
4. Close the Preferences window.

Google Chrome:

1. Select the Tools menu icon (wrench symbol) at the top-right | select Options for Windows or Preferences for Mac.
2. Click Under the Hood at the left.
3. In the "Privacy" section | click Content settings.
4. Go to Cookies in "Content Settings."
5. Select Cookies by default or Allow local data to be set depending on your version.

To enable cookies on other browsers:

• Open the browser, and search the Help section for "cookies."