On Tue, 2 Sep 2014 23:06:29 -0700, Jon Perryman  wrote:
>
>... As you see, your SMTP ignores this error so anyone could potentially send 
>spam thru this SMTP.
> 
"[A]nyone" who can CONNECT via TCP/IP to port 25 of your system.  In most
cases a firewall will prevent this.

Note that this applies to a TCP/IP connection to SMTP.  Most z/OS users are
more familiar with the BSMTP protocol using the spool, which is less likely to
be widely exposed.

-- gil

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