The answer here is Blind carbon copy (bcc).
The original recipients of the letter are unable to see (blind) who else receives a copy if those parties are on the bcc list.
Answer:
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1.Select Tools (via the Gear Icon) > Safety > Delete browsing history....
NOTE: You can also access this menu by holding Ctrl + Shift + Delete.
2.Make sure to uncheck Preserve Favorites website data and check both Temporary Internet Files and Cookies then click Delete.
3.You will get a confirmation at the bottom of the window once it has successfully cleared your cache and cookies.
The above procedure for clearing cache and cookies should work for
the majority of websites, but certain website and applications such as
WiscMail require a more thorough procedure. If you are still having
issues, try to steps below.
<span>Note: The F12 developer tools in Internet Explorer 11 do not include a cache menu. This process will only work for IE10 or lower.</span>
1.Close out of Internet Options. Click on Tools and select Developer Tools.
2.In the Developer Tools window, click on Cache and select <span>Clear Browser Cache...
3.</span>
Click Yes to confirm the clearing of the browser cache
