我正在嘗試通過XAMPP配置Sendmail以發送電子郵件。在我的sendmail.ini中，我具有以下設置：# Set default values for all following accounts.logfile "C:\xampp\sendmail\sendmail.logaccount Gmailtls onport 587tls_certcheck offhost smtp.gmail.comfrom [email protected] onuser [email protected] mypasswordaccount default : Gmail我創建了這樣的測試腳本：$to = "[email protected]";$subject = "Hi!";$body = "Hi,\n\nHow are you?";$headers = "From: [email protected]" . "\r\n";if (mail($to, $subject, $body, $headers)) {    echo ("Message successfully sent!");} else {    echo ("Message delivery failed...");}我收到一條消息，說該電子郵件已發送但從未收到，在日志中，我得到：sendmail：傳遞過程中出錯：必須首先發出STARTTLS命令。有人知道問題可能在這里嗎？提前致謝！加茲