Free and Open Port 25 Use Is Doomed
It's a shame in a way and it will inconvenience many legitimate users. But it's inevitable: Rules for using port 25 will be tightened up by ISPs and eventually authentication will make the rules global.Its hard to blame Comcast for beginning, as the Washington Post reported, to block port 25 on systems on their network that appear to be spammers. Everyone knows that a huge amount of spam is sent through broadband client systems that have been taken overthrough backdoorsby spammerszombiedand nobody has more broadband clients than Comcast. While this move costs money and is potentially troublesome for Comcast, slowing down spam is not the only upside to doing this. The article claims that the change has brought about a 20 percent reduction in spam. Assuming that means 20 percent of the spam coming into Comcasts system, thats a lot of freed-up bandwidth.
Since spam makes up at least 50 percent of all e-mail, a 20 percent reduction in spam translates into a more than 10 percent reduction of overall mail, increasing the quality and reliability of that e-mail. And of course its an improvement for even those of us not using Comcasts network because a lot of those zombies send spam to us.