Deliverability.com has a blog post from Naeem Kayani at Adknowledge about the recent Yahoo changes. They point to the reputation of the From: address as a factor. I’m not sure anyone knows what exactly Yahoo is doing, but the suggestions from Naeem are good ones.
One of the most common things I hear is “but why does the ISP do it that way?” The generic answer for that question is: because it works for them and meets their needs. Anyone designing a mail system has to implement some sort of spam filtering and will have to accept the potential for lost mail. Even the those recipients who runs no software filtering may lose mail. Their spamfilter is the delete key and sometimes they’ll delete a real mail.
Every mailserver admin, whether managing a MTA for a corporation, an ISP or themselves inevitably looks at the question of false positives and false negatives. Some are more sensitive to false negatives and would rather block real mail than have to wade through a mailbox full of spam. Others are more sensitive to false positives and would rather deal with unfiltered spam than risk losing mail.
At the ISPs, many of these decisions aren’t made by one person, but the decisions are driven by the business philosophy, requirements and technology. The different consumer ISPs have different philosophies and these show in their spamfiltering.
Gmail, for instance, has a lot of faith in their ability to sort, classify and rank text. This is, after all, what Google does. Therefore, they accept most of the email delivered to Gmail users and then sort after the fact. This fits their technology, their available resources and their business philosophy. They leave as much filtering at the enduser level as they can.
Yahoo, on the other hand, chooses to filter mail at the MTA. While their spamfoldering algorithms are good, they don’t want to waste CPU and filtering effort on mail that they think may be spam. So, they choose to block heavily at the edge, going so far as to rate limit senders that they don’t know about the mail. Endusers are protected from malicious mail and senders have the ability to retry mail until it is accepted.
The same types of entries could be written about Hotmail or AOL. They could even be written about the various spam filter vendors and blocklists. Every company has their own way of doing things and their way reflects their underlying business philosophy.
Yahoo announced today that they would be decommissioning the Goodmail specific MX machines as of March 24. Goodmail customers should talk to Goodmail about necessary transition issues. On Yahoo’s end, my understanding is that they are working to make the transition as painless as possible for the customers of Goodmail.
This seems to be the final nail in the coffin for Goodmail at Yahoo.
I’ll have more next week on how senders can cope with the loss of Goodmail certification.
Ken announced yesterday that Holomaxx dropped their suits against Ironport and ReturnPath. Suits against Yahoo and Hotmail are still active.
In the Yahoo case, there is a case management meeting on January 14th.
In the Microsoft case, a response the complaint is due by December 17th.
I’m not quite sure what happened to prompt this change, but I think it makes it even more unlikely that the case will be successful. The courts have repeatedly ruled in favor of ISPs in these kinds of cases.
EDIT: I’d link to Ken’s article, but I appear to have closed that tab and I can’t find it on his website. I’ll add it as soon as I do.
EDIT: Ken’s announcement