Blocking MX query

Jay Ashworth jra at
Tue Sep 4 18:17:06 UTC 2012

----- Original Message -----
> From: "William Herrin" <bill at>

> > I'm a bad subscriber, Bill?
> Okay, fair enough. There are no good users *expecting* to send email
> direct to a remote port 25 from behind a NAT. There are some good
> users who occasionally run slightly sloppy configurations which might
> attempt spurious port 25 connections.

I do, in fact, expect that.  You're alleging that's a bad practice.

> Good to block port 25. Not good to knee-jerk ban users whose machines
> happen to poke the port once or twice.

I wasn't even talking about banning or blocking me.  I was, as you'll see
in my other response, exercising the end-to-end architecture of the 
Internet, as members of this list regularly exhort that I should be able

"This is why we can't have nice things" is not, actually, a sufficiently
useful excuse for me to not agree with that principle.

-- jra
Jay R. Ashworth                  Baylink                       jra at
Designer                     The Things I Think                       RFC 2100
Ashworth & Associates         2000 Land Rover DII
St Petersburg FL USA               #natog                      +1 727 647 1274

More information about the NANOG mailing list