Re: [IMail Forum] Error 554?

[Matt]

Jason, Spammers are now using zombies to relay through their ISP's mail servers which is problematic because you don't want to blacklist an ISP mail server (though SpamCop does this all the time).  If everyone starts blocking outbound port 25, it will cause this practice to become even more common. As an E-mail provider I can also tell you that this is very problematic for my business.  I have taken hours to diagnose conditions where an ISP started blocking port 25 unannounced, and I have also had to deal with many less savvy people that think that I am responsible for their outgoing E-mail when they are using the server of their ISP.  I started offering E-mail services several years ago after getting tired of trying to deal with various ISP support lines to fix my customer's issues, and I don't wish to go back to that. There are methods other than blocking port 25 that can be used without impacting the customer or businesses such as mine, such as monitoring for excessive use and then cutting off the IP and or account.  Blocking port 25 is a lazy way of resolving the spam problem, i.e. hitting a nail with a sledgehammer. Matt Jason wrote: Blocking subscriber networks is a wonderfull idea, but as many have pointed out, it doesn't work in the real world. The real answer is to have the offending ISPs block port 25 from their subcribing nets. This achieves the same result, and forces the ISP to take responsibility for spam. That being said, the only way to do this is for everyone to start ruffling feathers at said ISPs (not going back and forth on this list). The best way to do this is to get the word out, talk to your local TV stations, get radio interviews, get the word out to the un-knowing public that there is a way to curb a LOT of this spam. Right now, everyone (Joe Public) thinks that there is nothing they can do about it, and that is just wrong. There is a lot that can be done, but they just need to know their options. Regards, Jason -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Panda Consulting S.A. Luis Alberto Arango Sent: Friday, February 13, 2004 8:25 PM To: [EMAIL PROTECTED] Subject: RE: [IMail Forum] Error 554? Just my thoughts: We prefer to have all spam come into our customers mailboxes and rather look for a local antispam solution at the users end. We manage 130 different domains from companies doing business with many countries around the world. If I block IPs (using a blacklist) and by any chance one good email is blocked then murphy's law stars playing its part... and the good mail was for the CEO of the company and is the want he was waiting for with the information to win a multibillion contract with the government... so.. somebody will be very mad at us... We haven't find any good proven solution to prevent spamming but Blocking IPs is not an option. And looking at the other side of the page, it is quite frustrating when your customer calls you telling you that somebody out there is not getting their emails because our Ips are in the black list. Then you find out that you were blacklisted because your IP is part of a block owned by Verio, and there is this boycott thing against Verio... so at the end it is your fault to have an IP owned by Verio. Doesn't sound fair to me, but such is life... -Luis -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Len Conrad Sent: Friday, February 13, 2004 1:45 PM To: [EMAIL PROTECTED] Subject: RE: [IMail Forum] Error 554? Is this becoming common practice to just deny entire IP address blocks due to listings on spam databases? Sure, if your MXs statistics show that 5 or 10 addresses from a Class C are abusing you, then you have every right to block the entire Class C. The network operator responsible for the Class is not policing his network, so your concluding that other IPs in that Class will sooner or later also be spamming you is valid. A good analogy is that the network operator is operating a factory that is spewig crap that is polluting your air, so you boycott all that factory's products. This is the logic behind blocking "subscriber" networks by PTR hostname and by HELO hostname. Your MX is receiving 10's of 1000's of spams from charter/att/comcast/rr/telus/pacbell/sbd/etc/etc/etc networks, for every handful, if any, of valid msgs, so you block all those subscriber networks until those multi-$$billion network factories, which huge, highly competent, highly paid IT staffs, stop polluting your email environment. Len _____________________________________________________________________ http://MenAndMice.com/DNS-training : Chicago; Wash DC; Atlanta http://IMGate.MEIway.com : free anti-spam gateway, runs on 1000's of sites To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ ______ [Email scanned for viruses by Panda Consulting -www.pandacons.com-] [Email escaneado contra virus por Panda Consulting -www.pandacons.com-] ______ [Email scanned for viruses by Panda Consulting -www.pandacons.com-] [Email escaneado contra virus por Panda Consulting -www.pandacons.com-] To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ -- ===================================================== MailPure custom filters for Declude JunkMail Pro. http://www.mailpure.com/software/ =====================================================