Your Ezine-Engine account gives you the option to receive notification every time a new reader joins your list.
You might like knowing, in real time, who is subscribing to your newsletter.

You might just be curious.
You might get a motivation boost from seeing your promotion efforts paying off in a bigger audience.
If someone who is prominent in your niche joins your list, you might want to know right away, so you can give them special attention.
The alert you receive will tell you which of your lists the new reader joined, and their name and email address. If you are tracking ads, you'll also be told which ad brought in the new subscriber.
If new subscriber alerts aren't useful for your project, you can easily turn them off with one click.
This feature can be turned on or off per newsletter, so some of your lists can have new reader alerts, while other lists do not. It's up to you.