We have multiple measures of deliverability. Ones that we don’t even let in the door, and then we have ones that customers indicated that they don’t want to be delivered.
– Jeff Bonforte, Senior VP Communications, Yahoo Mail
Read a little more about Yahoo and spam over at Tech Insider, or listen to the podcast at codebreaker.codes.
Over the last few months I’ve seen people complaining about losing the Yahoo FBL emails with verification codes. This seems to be intermittent and no one could really explain what was going on.
Dale Lopez, VP of operations for V12 group, shared that their operations group discovered that one issue with the missing verification emails has to do with the length of the From: address and a port25 default settings.
In Dale’s words:
Occasionally when we meet longtime readers of the blog at conferences and industry events, they are surprised to learn that we are not just bloggers. We actually spend most of our time consulting with companies and service providers to optimize their email delivery. Though we try to avoid using the blog as a WttW sales pitch, we thought it might be useful to devote a short post to explaining a bit more about what we do.
Read MoreFor a while, Yahoo was giving preferential “images always on” treatment to Return Path Certified senders. The tricky part of this was the senders had to register a DKIM selector key with Yahoo. I had a lot of (somewhat rude) things to say about this particular design decision.
Over the last few months, a number of senders have complained about being unable to update their selector keys with Yahoo. (Insert more rude comments about how broken it is to use the selector as a part of reputation.) Around the same time, a few of us have noticed that Yahoo seems to be turning on a lot of images by default. A few of the ESP delivery folks collaborated with me on checking into this. They could confirm that images were on by default for some of their customers without certification and without selector key registration.
Earlier this week, Return Path sent out an email to users that said that Yahoo would no longer be turning images on by default for Return Path Certified IPs.