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They haven't blocked them because the services can't block the spammer from forging their domain for malicious purposes. Email has historically had a broken authentication system. And by broken I mean the authentication is built on rather than built in the protocol. So take note they might not be sending these emails through the services at all and might ...


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I assume @user10012 is referring to the fact that google doesn't seem to take action against accounts sending malicious or unsolicited emails from "@gmail" accounts. So that users can benefit from an instantaneous messaging service gmail doesn't screen outgoing messages except if the user has generated suspicious activity, which would require a captcha be ...


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Botnets often consist of thousands of machines. The largest ones count even hundreds of thousands. When one machine gets blacklisted by a service provider for spamming, another machine from the botnet is used instead. Also, most members of botnets are machines at private internet connections which do not have static IP addresses. That makes them very hard ...


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They use dict attacking schemes or brute force, to guess passwords of other email accounts on external submission servers or SMTPS servers (465/587). Sometimes, the bots do have a copy of a compromised Email/Password database, and as many have the same password to their Email account as to many forum/site accounts, they can easily find out which mail server ...



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