> 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.

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