Yahoo List-Unsub header
Last week some folks were mentioning a spike in unsubscribes from Yahoo. This is being investigated.
Last week some folks were mentioning a spike in unsubscribes from Yahoo. This is being investigated.
An interesting observation from Brian Curry about how Microsoft is using the List Unsubscribe header in their interface. The short version is that Microsoft is only supporting mailto: links. They’re ignoring any List-Unsubscribe links that are a URL.
Here are some screenshots. When the sender is using a List-Unsubscribe <http://> header, Microsoft states that there is no information on how to help the user unsubscribe, so the offer to block the sender instead. Like in these two messages.

When the List-Unsubscribe header uses a mailto: link, Microsoft uses completely different language in the popup and does let the user know any future mail will go to the junk folder.

Dear Laura,
We have some questions about best practices for unsubscribes. Our ESP uses the List-Unsubscribe header by default on every email. I’m not familiar with this, and I have some questions for you.
First, do you think this is a good idea? Should we always use it, or just for certain emails? Should we use the mailto:link or link to a web site to unsubscribe?
We were also asked about double opt-out and if we should do it. We’re thinking that if someone clicks on the unsubscribe link they would be directed to a site displaying a message such as “Sorry to see you go. We have sent an email out for you to fully unsubscribe from the mailing list”. They then have to open the email and click on the link. Do you recommend doing this? Are there anti-spam regulations that this might violate?
And then, once someone unsubscribes (either with double opt-out or not), should we send out some sort of email confirmation? We currently do not, but we’re thinking of sending something like “Sorry to see you go. If you unsubscribed accidentally please click here to re-subscribe.” What do you think?
Thanks,
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