You must include at least the mailto portion of the List-Unsubscribe header, since some services only support this portion (iOS, for example). However, many inbox providers and mail clients honor both methods. To ensure that the greatest number of your recipients have the ability to unsubscribe from your emails, thus protecting your reputation as a sender, we recommend including both mailto and http.

You must include at least the mailto portion of the List-Unsubscribe header, since some services only support this portion (iOS, for example). However, many inbox providers and mail clients honor both methods. To ensure that the greatest number of your recipients have the ability to unsubscribe from your emails, thus protecting your reputation as a sender, we recommend including both mailto and http.

List-Unsubscribe is a small piece of text that can be inserted in the header section of your email. The List-Unsubscribe header will insert an “unsubscribe” button, or link, next to the From address at the top of your email. A recipient can click this link to notify you that they would like to unsubscribe from your emails.

List-unsubscribe can help reduce spam complaints.If subscribers can’t find the unsubscribe link, they may click the spam reporting button instead. This could hurt your email deliverability and sender reputation. To mailbox providers, a spam complaint is a spam complaint, regardless of whether the recipient actually perceived the message as malicious.

Support for list-unsubscribe varies across email clients.

It looks like this is a newsletter, but we aren't sure if it is safe to unsubscribe from it using the information provided by the sender

Apparently, Google uses some additional heuristics to decide whether the link should be displayed or not. The List-Unsubscribe header could be abused by spammers to validate that their target got the message, and thus, GMail only shows the unsubscribe link if the source of the message has accumulated sufficient trust.

Let’s say, you’ve set up the list-unsubscribe header to you email campaign. Check out whether it works by sending an email to a test inbox. For Gmail, you’ll see the unsubscribe option in the header right next to the sender name

Now I just have to figure out why Gmail isn’t showing the Unsubscribe option like everyone says it should.

Most mailing list providers will encourage you to insert a mailto and URL within the header of your emails, or they will be automatically provided.

List-Unsubscribe-Post: List-Unsubscribe=One-Click List-Unsubscribe: <https://solarmora.com/unsubscribe/example>