When I launched Print Tip of the Week in 1999 (now called Print Tips), blogs didn’t exist in the mainstream. So my weekly communication was christened an enewsletter because it was – and still is – emailed.
That right there is the primary difference between a blog and an enewsletter.
A blog lives on the web, typically on your web site. An enewsletter may also find a home on your site (as do Print Tips and its sister, Everyday Content Tips), but its name is derived from its publishing channel: email.
There are other differences.
Your enewsletter may include news information about your business – your products, speaking engagements, maybe staff announcements.
Your blog would not include news. It’s your opportunity to share an idea, make a point, and enlighten your audience.
Here’s one thing I love about blogs: they live on the web, making them super easy to share. (Always have your social sharing buttons 
available on your blog pages.)
Here’s one thing I love about enewsletters: you push them out to your subscribers. As long as the content is good (relevant, well written, and of “Goldilocks length”), subscribers will look forward to receiving them. They may even forward them. They will share them socially if you’ve uploaded the content to your web site. Please do.
Could you email your blog posts to a list? Mais oui. It’s smart. You should also use social sharing and an RSS feed as well. This way, you also “push” your blogs. Otherwise, they’ll just sit there, hoping to “pull in” those eyeballs.
(c) 2016 Margie Dana