> 
> The spam is coming from many different IP ranges, with little
> repetition.   Most of them are from countries like Afghanistan,
> Kyrgyzstan, Azerbaijan, Kazakhstan, and Uzbekistan.  Are these the
> latest sources that spam software is using, because other countries have
> tightened up their security?

Do you at least verify the reverse lookup? That already stops a lot of such 
networks.

> I've been using spamassassin for almost several decades, and I've never
> noticed anything like this.  I don't understand why the spam continues
> to be sent over and over.  I do reject emails with a very high spam,
> which these spams have.  So I tried changing my configuration to discard
> the email instead, hoping the spammer software would decide that the
> email had been received.   This didn't help.   I'm curious if anyone is
> noticing this spam. Thanks.  - Mark
> 

This takes a while (afaik months at least). 

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