Best Newsletter Plugin? Plus, How Much Does It Boost Blog Traffic?

Hey everyone, just for context—I started not too long ago, but since I moderate a trending subreddit, I can add links to my articles under viral posts. Because of this, I’ve been getting around 2–3k visitors per day for the past two months.

I’m considering adding a way for people to subscribe to a newsletter, though I don’t have one yet. For those with experience, I’d love to hear your insights on the following:

1. Which plugin would you recommend, and what are its pros and cons?
2. What percentage of your blog visitors, on average, subscribe to your newsletter?
3. How much does having a newsletter help drive traffic to new blog posts?

Thanks in advance!