當你在網路上面留下您的信箱的時候，你可能希望那些網站不要賣掉你的信箱資料，
你可以這一作，你可以使用簡單的方式，當你有個GMAIL的帳號的時候，假設您的帳號是
username@gmail.com 當你在某個網站samplesite.com註冊您的信箱資料的時候，您可以使用下面方式輸入您相關的資訊，username+samplesitecom@gmail.com 的格式輸入，當GMAIL收到信件的時候看到"+"的信箱位置的時候，GMAIL知道您的使用帳號是username@gmail.com
就可以正常寄收信件，這時候當您發現到你的信箱帳號在垃圾名單的時候username_samplesitecom@gmail.com 你就知道是哪一個網站把你的信箱賣了。
When you give your email address to a website, you hope that they don't sell or trade your address to a bunch of spammers. Well if they do, here is a simple way to see what sites are responsible for what particular piece of email. This requires you have a Gmail account. If your Gmail login name was username@gmail.com and you went to samplesite.com to fill out a registration form, instead of just entering username@gmail.com as your email, enter it as username+samplesitecom@gmail.com instead. When Gmail sees a "+" in an email address, it uses all the characters to the left of the plus sign to know who to send it to. In this example it would still send it to username@gmail.com. Now whats cool is if you search Gmail for username+samplesitecom, you will see all massages that were sent to that email address. To see who is responsible for sending a specific message click the Show Details link and you will see the complete address.
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