Make it possible to configure List-Help instead of List-Unsubscribe
All mail sent via Mailjet currently includes a List-Unsubscribe header that has email clients such as Apple Mail show an unsubscribe button even for mail that is just sent to one recipient and not at all from any kind of mailing list.
This is causing problems when people click to unsubscribe from system emails that they really don’t want to opt out from.
Instead, please make it possible to set the equally compliant List-Help header described in 2.17 of https://certified-senders.org/wp-content/uploads/2017/07/CSA_Admission_Criteria.pdf. This just links to a web page that describes why the user received the email.