Sim
Well-known member
I should also note that if your ESP modifies the unsubscribe headers like SparkPost does - then the unsubscribe won't work for What's New Digest emails.
However, assuming you have implemented a system to capture the unsubscribe notification coming from your ESP and turn off "Receive news and update emails" setting for the user when they unsubscribe (which is the default behaviour of XenForo), then you should make sure the "Only send to users opting to receive news and update emails" option is turned on in the What's New Digest options in the Admin CP, which will ensure digest emails aren't sent to users who have unsubscribed.

However, assuming you have implemented a system to capture the unsubscribe notification coming from your ESP and turn off "Receive news and update emails" setting for the user when they unsubscribe (which is the default behaviour of XenForo), then you should make sure the "Only send to users opting to receive news and update emails" option is turned on in the What's New Digest options in the Admin CP, which will ensure digest emails aren't sent to users who have unsubscribed.
