<br />
<b>Fatal error</b>:  Uncaught Error: Call to undefined function PHPMailer\PHPMailer\mail() in /home/r91567/public_html/wp-includes/PHPMailer/PHPMailer.php:881
Stack trace:
#0 /home/r91567/public_html/wp-includes/PHPMailer/PHPMailer.php(1972): PHPMailer\PHPMailer\PHPMailer-&gt;mailPassthru('marcin.dobrucki...', '[cnnd.org] Dail...', '&lt;!DOCTYPE html ...', 'Date: Thu, 3 Ap...', NULL)
#1 /home/r91567/public_html/wp-includes/PHPMailer/PHPMailer.php(1693): PHPMailer\PHPMailer\PHPMailer-&gt;mailSend('Date: Thu, 3 Ap...', '&lt;!DOCTYPE html ...')
#2 /home/r91567/public_html/wp-includes/PHPMailer/PHPMailer.php(1525): PHPMailer\PHPMailer\PHPMailer-&gt;postSend()
#3 /home/r91567/public_html/wp-includes/pluggable.php(546): PHPMailer\PHPMailer\PHPMailer-&gt;send()
#4 /home/r91567/public_html/wp-content/plugins/better-wp-security/core/lib/class-itsec-mail.php(890): wp_mail(Array, '[cnnd.org] Dail...', '&lt;!DOCTYPE html ...', Array, Array)
#5 /home/r91567/public_html/wp-content/plugins/better-wp-security/core/modules/notification-center/class-notification-center.php(577): ITSEC_Mail-&gt;send()
#6 /home/r91567/public_html/wp-content/plugins/better-wp-security/core/notify.php(213): ITSEC_Notification_Center-&gt;send('digest', Object(ITSEC_Mail))
#7 /home/r91567/public_html/wp-includes/class-wp-hook.php(324): ITSEC_Notify-&gt;send_daily_digest(false, 1720916668, Array)
#8 /home/r91567/public_html/wp-includes/plugin.php(205): WP_Hook-&gt;apply_filters(false, Array)
#9 /home/r91567/public_html/wp-content/plugins/better-wp-security/core/modules/notification-center/class-notification-center.php(845): apply_filters('itsec_send_noti...', false, 1720916668, Array)
#10 /home/r91567/public_html/wp-content/plugins/better-wp-security/core/modules/notification-center/class-notification-center.php(795): ITSEC_Notification_Center-&gt;send_scheduled_notification('digest')
#11 /home/r91567/public_html/wp-content/plugins/better-wp-security/core/modules/notification-center/class-notification-center.php(766): ITSEC_Notification_Center-&gt;send_scheduled_notifications(Array)
#12 /home/r91567/public_html/wp-content/plugins/better-wp-security/core/modules/notification-center/class-notification-center.php(722): ITSEC_Notification_Center-&gt;check_notification_schedule_accurate(Array)
#13 /home/r91567/public_html/wp-includes/class-wp-hook.php(324): ITSEC_Notification_Center-&gt;check_notification_schedule_fast('')
#14 /home/r91567/public_html/wp-includes/class-wp-hook.php(348): WP_Hook-&gt;apply_filters(NULL, Array)
#15 /home/r91567/public_html/wp-includes/plugin.php(517): WP_Hook-&gt;do_action(Array)
#16 /home/r91567/public_html/wp-settings.php(695): do_action('init')
#17 /home/r91567/public_html/wp-config.php(107): require_once('/home/r91567/pu...')
#18 /home/r91567/public_html/wp-load.php(50): require_once('/home/r91567/pu...')
#19 /home/r91567/public_html/wp-blog-header.php(13): require_once('/home/r91567/pu...')
#20 /home/r91567/public_html/index.php(17): require('/home/r91567/pu...')
#21 {main}
  thrown in <b>/home/r91567/public_html/wp-includes/PHPMailer/PHPMailer.php</b> on line <b>881</b><br />