OT: third party relay attack

[Pierre Abbat]

On Friday, 10 January 2020 12.50.52 EST Matthew Dillon wrote:
> There isn't a whole lot that can be done short of white-listing only
> allowed originators and recipients.  Most anti-spam services filter out
> critical non-spam emails along with the spam.

What do you mean by anti-spam services? What are some examples? What criteria 
do they use to block spam?

Pierre
-- 
Lanthanidia deliciosa: What the kiwifruit would be
if it weren't so radioactive.