VectorStar Networks Archive | Laird's Site
VectorStar Networks Archives

Laird's Site

Qmail: nullenvsender patch

nullenvsender patch for qmail+starttls+smtp-auth

Charles Cazabon wrote this patch to modify qmail-smtpd to refuse messages from the null envelope sender if they have more than one envelope recipient. This is a trick to keep people from sending mass spam mails, emulating bounce messages. All we did was modify this patch so that it could be applied to a qmail source tree that had already been patched for TLS and smtp-auth.