First test if email sending works on your webserver's php. References are:
https://tecadmin.net/send-email-using-php-script/
https://www.tutorialspoint.com/php/php_sending_emails.htm
https://www.arclab.com/en/kb/php/how-to-test-and-fix-php-mail-function.html
https://conetix.com.au/support/simple-php-mail-test/Then refer the EMail Issues @ Wiki and search the forum for assistance. Contact your hosting provider / sysadmin for further assistance.
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