> On Dec 4, 2016, at 12:58 AM, @lbutlr <krem...@kreme.com> wrote: > >> MAIL FROM<"<script >> type='text/javascript'>alert('xss');</script>"@example.com> > > That result in "501 5.5.4 Syntax: MAIL FROM:<address>"
There's a missing ":" after FROM. In any case, even if a particular exploit mechanism fails, or even all attacks happen to fail, what you're doing is still unwise. -- Viktor.