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What email Service question2answer.org use? Does it use local PHP mail or SMTP.
Q2A version: 1.8.6

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From the code qa-include/app/emails.php, it appears Q2A uses PHPMailer.

It does not require a local mail server.  But if you select SMTP, then it uses the sendmail binary to send the mail to the configured server.

Check this page for doc and troubleshooting:

GitHub - PHPMailer/PHPMailer: The classic email sending library for PHP

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