Posts Tagged ‘yahoo’

Changes to Yahoo & AOL’s DMARC Policy

Posted: Thursday, May 22, 2014
Posted by ksimpson.

Yahoo & AOL Mail recently updated their DMARC (Domain-based Message Authentication, Reporting and Conformance) policy to “reject”. The new policy means that messages from Yahoo! and AOL addresses will be rejected by email receivers unless they originate from a Yahoo! or AOL mail server. This change makes it impossible for spammers and fraudsters to impersonate Yahoo! and AOL users when sending email through systems not owned by the companies. At the same time, it makes forwarding and other legitimate uses of Yahoo! and AOL addresses much more difficult. Why was the change made? Both Yahoo! and AOL have acknowledged that the change was made in order to reduce the use of Yahoo! and AOL addresses by spammers and fraudsters. Before the change, it was commonplace for nefarious actors to send email Help! What should I do? It is recommended to change the FROM address to a non-AOL or non-Yahoo! email […]

The World’s Most Popular SMTP Error Responses

Posted: Tuesday, June 29, 2010
Posted by ksimpson.

We recently took a look at about 9 million delivery attempts through one of our outbound spam filtering customers’ systems and compiled a list of the most common spam connection rejection messages. I’ll share the list with you later in this blog post. But first, a bit of technical background for the uninitiated.

Email Deliverability Tips: Why Can’t My Mail Server Deliver Mail to Yahoo! or AOL?

Posted: Thursday, June 12, 2008
Posted by ksimpson.

With constantly growing spam volumes, large email providers have been forced to take measures to reduce spam’s impact on their infrastructure and on their customers. Unprotected email systems are easily crippled by spam outbreaks and it doesn’t make sense to overbuild capacity to meet what-if situations. One way large email providers protect their systems is through the use of a reputation database along with mail architectures which use the database to rate-limit or block emails. AOL, Yahoo!, and others maintain proprietary reputation systems. The following best practices can help maintain your good reputation – improving your mail deliverability not just to Yahoo! and AOL but to everywhere. If you are having problems with your emails bouncing or being treated as junk, there are three steps you can take which can improve your deliverability: A) Check the reverse DNS entry for your outbound mail server’s IP address Make sure the forward […]

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 […]