Translations:Survey participants/214/en

When sending an email, the LimeSurvey email bounce tracking system automatically adds a survey-id and token-id to the mail header. These "custom headers" are added to each invitation email that is sent through your LimeSurvey installation to survey participants. When the email is bounced back, the original header along with the "Delivery notification" header is received. The system then checks for new emails and parses the emails that have these custom headers and marks the wrong email address in the survey participants table.