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An error / warning message on my dashboard (at the top) saying - 'Send mail function may failed.'

From @kwcjr, transferred from the MainWP Facebook group:
Use below snipit to create this file in your sites Root folder; then navigate to it. You will see a white page & then receive an email if everything is working right with your PHP mail Function.

Make sure you have WP Debug ON during this test.
PLEASE delete this file after testing!
https://bitbucket.org/snippets/keith_crain/eeoA6n/used-to-test-if-php-mail-function-is

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