It has been a while, Alex
You signed up to hear from [Your name] and we have not seen you open one in some time. That is fine; inboxes are full.
[One sentence on what is new since they last looked. The best reason to stay, not a list.]
If you would rather not get these, the link at the bottom removes you in one click and we will not ask twice.
Either way, thank you for having been here.
[Your name]