Fehlermeldung

• Warning: Cannot modify header information - headers already sent by (output started at /home/yacob/public_html/includes/bootstrap.inc:1692) in drupal_send_headers() (Zeile 1551 von /home/yacob/public_html/includes/bootstrap.inc).
• Error: Call to undefined function mail() in DefaultMailSystem->mail() (Zeile 79 von /home/yacob/public_html/modules/system/system.mail.inc).