David Saez Padros wrote: > Hi !! > > >>> 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. >> > > this looks like a faulty implementation, i'm sure that this 70-100 > callouts/second to your server where also a problem for Verizon > > all of this drives to no place ... wouldn't it be more practical to > recommend good callout practices ? > Generally what you want to do is block on the good blacklists, bad HELO, verify recipient, and other blocking tricks forst and then do sender verification last. I try to reduce callout traffic as much as I can.
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