Cron job, then a cron plugin.
Have exemple here framagit.org/SondagePro-LimeSurvey-plugin/sendMailCron of usage of cron event ( manual.limesurvey.org/Cron ) .
Have exemple here framagit.org/SondagePro-LimeSurvey-plugin/sendMailCron of usage of cron event ( manual.limesurvey.org/Cron ) .
