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php has a command named echo. someone asking you to echo a value, means to literally add an echo command in front of a variable so that you can see what value it actually is, and than can show others. this debugging step lets you confirm that you actually have expected values as input for the code to use. the or die(...) output you are getting means that the mail() call failed with a php error of some kind. please review the other replies you have gotten in this thread.