Marketers send out timely emails to large groups of people who have signed up for their contact list to inform potential customers of sales, discounts, and product launches. The impact of email marketing is clear: When used strategically, it can have an average return on investment (ROI) of 4,200 percent for every dollar invested.

• Timed emails that raise brand awareness during holiday seasons
• Blast emails that inform recipients about upcoming sales events
• Targeted emails that send personalized offers and messages to specific groups on an email list