[Mimedefang] Email injection and the android 'email' app

[Les Mikesell]

On Mon, Mar 4, 2013 at 11:30 AM, Dale Moore <Dale.Moore at cs.cmu.edu> wrote:
>
> The android 'email' app, will NOT take this 'permanent' failure as definitive,
> and instead try again shortly to resend the email.   The email remains the
> the app's 'Outbox' .  I currently have dozens of remote android client
> that connect to my smtp server that regularly attempt to send their
> same mis-addressed email dozens of times a day for weeks on end.

Those aren't big numbers and it shouldn't bother your server much even
if they were orders of magnitude higher...   Why not just ignore it?
Or do you want to improve the user's experience by getting a DNS in
their inbox where they might see it - which is what would happen if
the server where they submit didn't know the user list?

-- 
  Les Mikesell
    lesmikesell at gmail.com