<cfscript>
    for (i=1;i LTE 400;i=i+1) {
        mail = new mail();
        mail.setTo("test@test.com");
        mail.setFrom("test@lucee.org");
        mail.setSubject("Test mail #i#");

        mail.addPart(
            type='text',
            charset='utf-8',
            body="This is a test mail #i#."
        );

        mail.addParam(file = "invoice.txt", content = toBinary(toBase64("test file: #i#")));

        mail.send();
    }
</cfscript>