Cai Ellis's Articles
Do I need a DMARC record? (No, but here’s why I highly recommend you get one!)
As an email marketer, implementing a DMARC (Domain-based Message Authentication, Reporting, and Conformance) record could be very beneficial...
What is IP Reputation and Why is it important for Email Marketers?
IP reputation in email marketing refers to the credibility of an IP address based on its history of...
DMARC vs DKIM vs SPF: What are the key differences?
SPF, DKIM, and DMARC are email authentication tools that help protect against email spoofing and make sure emails...
CAN-SPAM Act vs Email Marketing: Everything you need to know to stay compliant!
The CAN-SPAM Act provides important laws that govern the sending of marketing emails to US-based recipients. If you’ve...
Newsletter Subject Line Examples: 458 of the Best Ideas and Trends
Writing a newsletter is difficult enough. Coming up with a fun and catchy newsletter subject line that will...
What is the average ROI on Email Marketing 2026? And other ROI statistics
Key findings: On average, every $1 invested in email marketing generates $36 in return (a 3,500% increase) In...
Dynamic Content in Emails: The secret sauce of personalized email marketing!
You’re probably reading this because you want to start using personalization strategies in your email campaigns. Why? Because...
Average Email Deliverability Rate in 2026 (And other deliverability statistics)
At EmailTooltester, we’ve always recognized the importance of measuring email deliverability, which is why we’ve been running deliverability...
How many emails are sent per day? (Fresh data for 2026)
Key findings: In 2026, 392.5 billion emails are sent every day. By 2027, 408.2 billion emails will be...
