![]() This all and entirely automatically varies each spam campaign from the next and quite possibly one spam message to the next, meaning hand-coded rules can and variously will need to be changed from one spam message to the next. The spammers use tools that generate forged source addresses and random strings and generated text, and the spammers use breached mail servers, and breached mail clients. ![]() Rules won't work against spam, as the spammers use completely automated tools. SpamSieve and other similar tools use statistics from details across the entire message and all its headers to sort and to filter arriving messages, and that’s tougher for the spammers to fool. And outside of a few people and a few businesses that perpetually yammer at me, rule-based spam filtering just doesn’t work. In short, “no”, you can’t get where you want here with rules, and you’re far from the first to try. Open up a new rule and look at what you have for options, in conjunction with the raw source that you’re already looking at. Beyond the folks sending newsletters or other dreck from their own addresses or from some other consistent source or consistent structures and that are much easier to filter, you might get some brief respite from some of the arriving spam with the use of custom static rules, and the spammer will then alter or upgrade. ![]() Beyond what the static filter rules can capture, there is no way to filter on patterns or expressions in the messages. What message attributes mail can filter by in each rule show up in the template. ![]() Would any commercial business-and that’s what these spammers are, businesses-allow that to happen? Would any spammer-and this spam is all app-generated-generate their spam using a scheme that would be trivially intercepted by rules running on the mail server or on your mail client? Spammers make money getting this dreck-ads, schemes, propaganda-in front of each us. ![]()
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