Simple Python script as SMTP server for outgoing e-mails?

[Gilles]

On Mon, 22 Jul 2013 08:54:11 -0400, "Eric S. Johansson"
<esj at harvee.org> wrote:
>try http://emailrelay.sourceforge.net/

Thanks. I did find it, but it says it's not a full MTA:

"E-MailRelay is not a routing MTA. It forwards e-mail to a
pre-configured SMTP server, regardless of any message addressing or
DNS redirects."
http://emailrelay.sourceforge.net/userguide.html#SH_1_2

IOW, it'll just send outbound e-mails to my ISP's MTA, so I'm back at
square one.