Sales Contact Opt-out?

Is it possible to opt out of sales contact from those on the list?
Or is this simply the price to pay for seeking the list's wisdom?

From: Jason Barrette <jason@enetusa.com>
Sent: Friday, September 20, 2019 11:28 AM
To: Gary A Mumphrey <gary@lsu.edu>; Nicholas Warren <nwarren@barryelectric.com>
Subject: RE: sfps from fs dot com

Hi Gary,

[snip...]

Jason M. Barrette
President

D (949) 242-8077 M (714) 357-6295

Email: jason@enetusa.com <mailto:jason@enetusa.com>
Visit us at: www.enetusa.com <Search results for: '&gt';

From: Gary A Mumphrey <gary@lsu.edu>
Sent: Friday, September 20, 2019 7:44 AM
To: nwarren@barryelectric.com
Cc: Jason Barrette <jason@enetusa.com>
Subject: RE: sfps from fs dot com

Nicholas,

[snip...]

marketing is already prohibited by the rules of the group. It’s up to the moderators to police.

-mel

Please report to abuse@nanog.org

Yay, another company I can add to my 'never ever do business with even if they were the last company on earth'.

Thx!