Posts Tagged ‘dkim’

DMARC: Way cooler than it sounds

Posted: Sunday, May 13, 2012
Posted by ksimpson.

DMARC is a new specification that helps domain owners find out how their domain is being used in the context of email.

An update to the email standards

Posted: Thursday, October 02, 2008
Posted by ksimpson.

The standards that govern Internet email have just been replaced. RFCs 2822 and 2821 are now officially obsoleted by RFCs 5322 and 5321. What’s changed? I downloaded both standards, ran the raw text through a filter to remove extraneous things like page headers, and then compared the documents using Microsoft Word. It looks like most of the changes are intended to resolve ambiguities in the old standard. Here’s what I found: Changes from RFC 2822 to 5322 (Internet Message Format) 1. Slight changes to the rules for message headers in RFC 2822/5322 (the crossed out text is from 2822; underlined text is from 5322) – looks like the standard is locking down on the definition of “header folding” somewhat, which has previously been an area of some ambiguity: 2.2. Header Fields Header fields are lines composed ofbeginning with a field name, followed by a colon (“:”), followed by a field […]

Post #3 on Why Spam Filters Suck “trickle blog” series

Posted: Monday, April 07, 2008
Posted by d.liao.

Once Promising Proposals for a Final Ultimate Solution to the Spam Problem (FUSSP) “Two years from now, spam will be solved.” That was Bill Gates’ famous pronouncement back in 2004. Microsoft, Yahoo and the open source community devised two techniques that they believed would eradicate spam. The first was sender authentication, which allowed email senders to provide a list of the servers permitted to send email for users within their domain. The idea was that sender authentication would eliminate spammers spoofing legitimate email addresses, and allow for the creation of a permanent, ironclad white list of trustworthy domains that never send spam, thus allowing recipients to simply block everything not on the white list and end spam forever. Another idea pitched in 2004 was the computational challenge. Senders would, upon connecting to a receiving email server, have to spend considerable CPU cycles computing the answer to a mathematical challenge provided […]