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Oh, Microsoft

Things have been a little unsettled at Microsoft webmail properties over the last few months. A number of ESPs reported significantly increased deferrals from Microsoft properties starting sometime late in November. Others saw reduced open rates across their customer base starting in late October. More recently, people are noticing higher complaint rates as well as an increase in mail being dropped on the floor. Additionally, Return Path announced certification changes at the end of November lowering the Microsoft overall complaint rate to 0.2%, half of what is was previously.

Overall, sending mail to Microsoft is a challenge lately. This is all correlated with visible changes which may seem unrelated to deliverability, but actually are. What are the changes we know about?

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Poor delivery at Gmail but no where else

I’ve mentioned before that I can often tell what ISP is making filter changes by what my calls are about. The last few weeks it’s been Gmail where folks are struggling to get to the inbox. One of the things most clients and potential clients have mentioned is that they’re not having any problems at the other major ISPs.

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