A marketer’s guide to sustainable email marketing
June 30, 2025 | 
Gemma
Email marketing remains one of the most effective ways to connect with your audience. It is fast, measurable and cost-efficient. However, behind every campaign lies an often-overlooked cost: its environmental impact.
Each email consumes energy, from storage to transmission, and with billions sent every day, the carbon footprint adds up fast. While digital marketing may seem clean, its environmental toll is very real.
That’s where sustainable email marketing comes in. It helps reduce your footprint while improving how you engage your audience.
Climate-conscious email marketing
At Mosaic, we’re proud to be a certified B Corp and are committed to using business as a force for good. That’s why we spoke with EcoSend, now officially a B Corp themselves and believed to be the world’s first climate-conscious email platform, to collate some practical tips for reducing the environmental impact of your email marketing.
James Gill, Co-Founder of EcoSend says: “Sustainability and conversion from email marketing are aligned. It’s a win-win for all parties.”
“The great thing about digital sustainability is the actions you can take to increase efficiency and reduce environmental impact also help with running a better email campaign.”
“Optimising email size, for example, reduces carbon emissions and improves deliverability and engagement because smaller emails load faster, increasing the likelihood of interaction.”
Tips on how to make your emails more sustainable
1. Make your emails lighter
Reducing email size is a simple way to cut your environmental impact. Use compressed images, clean HTML and avoid unnecessary design. Your emails will load faster and use less energy, while also improving performance and user experience.
2. Focus on the right audience
Rather than emailing everyone, focus on those most likely to engage. Clean your lists regularly and use segmentation to tailor your messages. This reduces digital waste and improves results.
3. Choose platforms that support sustainability
The tools you use matter. Choose email providers that run on renewable energy and offset their carbon output. For example, EcoSend uses green hosting and supports reforestation and carbon capture.
4. Use automation to stay efficient
Automation helps you send fewer, more meaningful emails. Smart workflows can remove inactive contacts and ensure your messages are timely and relevant.
5. Track your environmental impact
Understanding the carbon footprint of your campaigns allows you to make better decisions. With tools like EcoSend, you can monitor your impact and adjust your strategy over time.
6. Why this approach works
Sustainable email marketing is good for the planet and good for business. Smaller, more focused campaigns tend to perform better, and customers are more likely to trust and support brands that show they care about their environmental impact.
Make a positive change
James added: “Our mission at EcoSend is to make email a force for good. Becoming a B Corp is a huge milestone for us, but it’s just the beginning. We’re proud to support purpose-driven organisations like Mosaic in building a more sustainable future for digital marketing.”
At Mosaic, we help you market with purpose and grow your business in a meaningful way. Turn over a new leaf in your marketing strategy. Let’s talk.