A "request email" refers to a message sent through email to ask for something or to inquire about something from another person or entity. It is a formal way of seeking information, assistance, or a favor. Full definition
They recently posted about the 10 reasons why your link requests are failing, a must read those sending out daily link request emails. (pointblankseo.com)
If you still can't find the number, use the «forgot my password» tool to request an email with your information or call customer service. (upgradedpoints.com)
NOTE: We only request your email address so that the person you are recommending the page to knows that you wanted them to see it, and that it is not junk mail. (science.sciencemag.org)