Check that the fields are entered just as in your currently open data source available. (A list of the Database Fields is shon in the tab “message”). In the step generate mailing do not choose the option BCC. When using the BCC option, database fields are not replaced, as each email goes to multiple recipients. Use the BCC option only in exceptional cases. With HTML-mails, check the database field in square brackets in the HTML source. If only the field name without the brackets were formatted (eg bold), the field can not be found and replaced. Always format the entire expression including the brackets.