1. 100% Anti-Spam
With Email Campaigns you always run the risk that emails don't arrive at your Contact's Inbox. They might be blocked by Spam Filters. Blog posts, however, are 100% opt-in and there is no way around it. People who are interested in your messages can subscribe by Email or RSS Feeds or regularly visit your Blog's URL. There is no risk of being blacklisted.
2. Blogposts get listed in Google, Newsletters not!
The content of an email disappears quickly in the subscriber's email archive. Blogposts are available for ever on the web and unlike email newsletters, get indexed by the major search engines. In fact as blog information changes regularly search engines often rate blogs higher than static websites. Additionally, you can link Blogposts back to your website which generates valuable Backlinks.
3. Blogposts can reach a bigger audience through syndication and social media
With blogs you can provide an RSS feed that can be used by blog aggregators, news sites or other feed reading mechanisms to amplify your reach. You can also leverage social networks such as Facebook and Twitter to spread your message even further. Find more information here.
On the other hand email newsletters are largely bound by the limits of their subscriber lists. They may be re-emailed by a few recipients, however cannot tap into broader syndication or social media channels to amplify your reach.
4. Newsletters are a one-way communication, Blogs can be a discussion
Email newsletters are almost always one-way outward communication. Blogs, however, are multi-way. You can encourage active public discussions. That provides more flexibility and options for how, why and when you communicate with your audience.
5. A Blog is more than just an Email
A blog isn't restricted to being a blog. Email newsletters are just emails, of course, providing valuable links to news stories or products on your website. But usually they are not able to offer other functionality. A blog isn't necessarily only a blog, it can be a highly interactive website. You can use a blog to also deliver static information about your company, multimedia presentations such as fotos and videos, social media tools, surveys, etc.
And a blog can also be an email newsletter. With the right tool, you're able to bundle blog posts for the last week or month and send them out as an email newsletter, as well. This basically allows you to have the best of both worlds - the targeted alerts of an email newsletter backed up by the flexibility, search ranking and longevity of a blog.
