Sad to not see a mention of tracking, i.e. the ability to disable open-tracking or click-tracking. Some services even have it disabled by default to respect subscribers’ privacy but sadly they weren’t included in the article. Some examples: Buttondown, Mailcoach, SendStack. No affiliation, I just researched them in the past (https://blog.daniemon.com/2022/11/15/privacy-first-newslette...)