Blocking MX query

Tue Sep 4 15:47:41 UTC 2012

On Tue, Sep 4, 2012 at 7:44 AM, Jay Ashworth <jra at baylink.com> wrote:
> ----- Original Message -----
>> From: "William Herrin" <bill at herrin.us>
>
>> There are no "good" subscribers trying to send email direct to a
>> remote port 25 from behind a NAT.
>
> Users, like myself, running Linux on home computers and laptops; our local
> sendmail-equivalents will in fact attempt direct delivery to remote SMTP MX
> servers, and we generally move around enough that setting a smarthost is
> semi-impractical, at least on laptops.

OpenVPN, et al...

nice for being able to not only relay via the home server, but also
access SMB or even NFS shares and the like, which you'd also not want
reachable from the outside.