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First on the list is 10MinuteEmail.com, a straightforward site that offers temporary email addresses valid for just ten minutes. This niche service draws significant traffic, with an estimated 1.1 million visitors per month. Using basic advertising revenue calculations, this site is projected to generate approximately $2,450 monthly. The beauty of 10MinuteEmail lies in its simplicity—one clear purpose and a user-friendly interface make it a gold mine for advertising.