> Of course, the MX checking can also be avoided, and a lot of spam-bots
> know to use the ISP connection instead of a direct port-25 approach. But
> at least that way, the mail gateway can (and often does) notice the
> flooding, and many ISP's successfully throttle at least some spam at the
> source, so it does actually have real meaning.
Actually some of the smarter big ISPs with the less technical customers
transproxy port 25 anyway - using big Linux boxes and the netfilter
code.
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