The main difference between an email blast and a newsletter is its purpose and frequency.
An email blast is a one-time or occasional mass email sent to many people at once, often for a specific promotional or marketing purpose, such as announcing a new product, promoting a sale, or inviting people to an event.
On the other hand, a newsletter is a regular and ongoing email communication sent to a list of subscribers. It typically contains various content, such as news, updates, tips, or promotions, and is designed to inform, educate, and engage the recipients. Newsletters are often sent regularly, such as weekly, monthly, or quarterly.