Autor: Jack Bailey Datum: To: exim users Betreff: Re: [exim] UCEPROTECT Blacklists and why callouts are abusive
> None of this is true for callouts. We are forced to expend server
> resources in handling callouts. Our ability to receive our own
> email is impaired by other people's use of callout verification.
> (How well would your mailserver stand up to receiving four orders
> of magnitude more connections per second than it should?)
Verizon did this to me once. A spammer was forging one of my domainnames
in a spam run so VZ was issuing 70-100 callouts/second to my server. I
had no usable mail service for hours, so I blacklisted their callout
farm. Then they blacklisted me for blacklisting their callouts.
