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An antispam technique that has caused some pain in recent days for some customers is that of compromising a user's email account and then using it to send out spam. This is an example of what I have earlier referred to as diplomatic immunity - hiding
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A couple of weeks ago, I blogged that some outfit in Russia claimed to have broken Yahoo's CAPTCHA for creation of new email accounts. Someone posted a reply in the comments with a link to an article that this was unlikely. Yet, in the past
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This is a follow up to my previous post . I recently looked up an old version of the PBL and decided to count up how many IPs they were blocking. By my calculations, if we expand CIDR ranges, the PBL blocks nearly 390 million IPs. Actually,
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Yesterday, one of our architects popped into my office and we had a brief discussion about blocklists. The topic shifted to how many IPs we have banned over the years. The total number of available IPv4 IP addresses is 2 32 , or 4,294,967,296 different
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