Robert Brandl's Articles
Why Your Sender Email Address Matters in Email Marketing: When It’s Best to use a Subdomain
So you’ve chosen your email marketing service and are ready to write your first newsletter? How exciting! But...
Email Subject Lines Character Limits: A Look At The Major Email Clients
How Long Can a Subject Line Be? This is a fairly common question and the answers can vary...
Emails from [email protected]? Why Am I Receiving Those?
So you are receiving daily emails from [email protected], and you are not sure why that is and what...
Delivery Issues with Outlook and Hotmail? Get Your Marketing Emails Delivered Again!
Microsoft’s email services are among the most challenging for email marketers, as I have seen again and again...
How to Run an Email Authentication Check (SPF, DKIM, DMARC) All You Need is a Gmail Address
Are you wondering how to verify the authentication of your emails? The three key forms of email authentication—SPF,...
How Email Marketing Benefits SEO A Guide for SEO’s
EmailTooltester is all about email marketing. But to drive traffic to our website, we rely largely on SEO....
How the Ultimate Tools newsletter makes up to $4,000 per month An Interview with Giovanni Fabris
Welcome to the #1 post in our new interview blog series, where we sit down with successful newsletter...
The Most Popular Email Service Providers (ESPs) in 2026
It is notoriously difficult to obtain reliable customer data for email service providers. In one of my more...
Learn and Earn More: 8 Affiliate Marketing Newsletters to Boost Your Business
The affiliate marketing industry is always growing, and it remains a lucrative one. I know this firsthand—my journey...
