On November 24, 2009, Brad Laue wrote:
True, but wouldn't a blacklist of SPF records for known spam issuing domains be a more maintainable list than an IP block whitelist?
(I'm no doubt missing something very obvious with this question)
Brad
Yes, I think you are :) First of all, domains are easier to throw away than IP Addresses, IP Lookups are more efficient than DNS SPF records, and SPF is not really meant to address Spam problems, although it can address some forgeries. SPF works best to identify forgeries of large well known domains, but I think you do not really understand what SPF records do, or how they work. Don't worry, many email operators don't either, and simply put in an SPF record that says that every IP can send email for that domain ;) And think how large the theoretical database size would be for every domain, compared to the limited size of the IPv4 space.. But this is better taken off list you want to discuss SPF's usage in combatting spam. -- -- "Catch the Magic of Linux..." ------------------------------------------------------------------------ Michael Peddemors - President/CEO - LinuxMagic Products, Services, Support and Development Visit us at http://www.linuxmagic.com ------------------------------------------------------------------------ A Wizard IT Company - For More Info http://www.wizard.ca "LinuxMagic" is a Registered TradeMark of Wizard Tower TechnoServices Ltd. ------------------------------------------------------------------------ 604-589-0037 Beautiful British Columbia, Canada This email and any electronic data contained are confidential and intended solely for the use of the individual or entity to which they are addressed. Please note that any views or opinions presented in this email are solely those of the author and are not intended to represent those of the company.