Re: [exim] Sender callout verification with warning only

>
> Do you realise that callouts are considered abusive in anti-spam circles and
> are often used in certain forms of ddos attacks ? Some major mail servers
> even BLOCK based on the number of callouts they receive from a given IP.
> Something like 80% of emails are spam, so 80% of your callouts are being
> directed at totally innocent machines. Challenge response methods should be
> considered in the same way.
>
I tend to consider them as a way of reducing spam, and everything that
does is for the Greater Good, IMO. Also, I'm quite happy to receive this
kind of requests at our server, so I'll happily use them myself -
according to some principle we read in some holy book or the other at
school...

- Toralf