5 of the Best Email Marketing Services 2026

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Email marketing is a powerful weapon in every marketer’s arsenal. This versatile means of reaching your audience can be used to drive retention, convert, promote product launches and sales, plus address the age-old problem of abandoned carts. In short, email marketing has the potential to reach your audience directly and drive sales in a highly effective way. So, it’s no surprise that email marketing is widely considered one of the most effective digital marketing strategies. There’s so much potential for achieving impressive results with help from an email marketing campaign. However, email marketing campaigns are only successful when you use the best email marketing service to deliver them. Choose the wrong email marketing platform, and you could find yourself with a low delivery rate and most of your emails landing in your customers’ spam folders. So, selecting your email marketing software with care is essential. Keep reading to discover five of the best email marketing services available in 2026 to make your decision a little easier.

Instiller

Coming in at number one on our list of the best email marketing services is UK-based company, Instiller. Instiller has hugely experienced platform, and was set up in 2004. What sets Instiller apart from the other email marketing services in this review is its agency-first approach. In fact, Instiller is the only email marketing service provider that is dedicated to agencies. Instiller’s white label service means that agencies can easily customise email campaigns to meet the needs of their clients. 

Instiller key features:

  • Templates can be customised with your own branding
  • 99.9% uptime
  • Integrates with other apps
  • No set-up fees
  • Cost-effective pricing to match your usage each month
  • No limits on sending domains, user logins, or data uploads
  • Reputation monitoring tool
  • A/B split testing
  • Simple email personalisation
  • Drag and drop builder

Instiller drawbacks:

  • Tailored for use by agencies.

Klaviyo

Klaviyo offers email marketing services and more besides. The platform offers CRM capabilities and can be used for email, SMS push notifications, WhatsApp, and RCS campaigns. Kalviyo is particularly strong in insights, with robust reporting in place to help its customers make informed, results-driven marketing decisions. 

Klaviyo key features:

  • Supports multiple channels, e.g. email, WhatsApp, SMS
  • Extensive integration options with other apps
  • Data and analytics-driven approach

Klaviyo drawbacks:

  • Very limited profiles and sending caps when using free plan
  • Limited customer support unless you upgrade to a more expensive plan

Zoho

Zoho provides an email marketing service and more. Using Zoho Mail enables you to manage your email and SMS campaigns with ease. For further consistency, it’s possible to integrate these marketing strategies into the Zoho CRM. This is helpful if you’re looking to manage your campaigns as part of a business suite alongside other capabilities.

A forever-free plan is available for companies looking to operate their email campaigns within the constraints of a minimal budget. However, as you would expect, the free plan does have limitations, and even as a light user, it’s likely that most companies will need to upgrade to a paid plan.

Zoho key features:

  • Can be used for email and SMS campaigns
  • Can be integrated with Zoho CRM
  • Integrates with other apps
  • Zoho mobile app available for managing campaigns on the go
  • Forever free plan available (with limitations)

Zoho drawbacks:

  • Can be costly to get the capabilities that you need beyond the free plan
  • Initial set-up of campaigns can be time-consuming

Campaign Monitor

If you’re looking for an easy-to-use email marketing service, then Campaign Monitor offers exactly this. This simple to navigate email marketing platform is equipped with basic features, but doesn’t offer many of the extra capabilities that other email marketing services on this list have available. 

Handy features such as drag and drop builder and the analytics capabilities of Campaign Monitor are either unavailable or limited for free plan customers and for those using some of the lower priced plans.

Campaign Monitor key features:

  • Drag and drop builder
  • Free plan available
  • Mobile-ready templates
  • Real-time results through the interactive dashboard

Campaign Monitor drawbacks:

  • Customer support not available with every plan
  • Drag and drop email builder requires an upgrade to more costly price plan
  • Analytics tools are limited for free plan customers

Mailjet

Mailjet is an established email marketing service and has been serving customers for 16 years. Mailjet offers an affordable email marketing service. It’s pricing structure is based on the amount of emails you send, rather than how many contacts you send them to. So, if you’re concerned that your current email list may have lots of inactive email accounts, this could help prevent you wasting money.

If you plan to integrate Mailjet with other apps, this is possible. Mailjet can integrate with over 100 apps, but be aware that integration may be more complex than you expect, and could require you to use third party platforms such as Zapier.

Mailjet key features:

  • Unlimited contacts, pay for emails sent
  • Free plan available
  • Intergration with over 100 apps possible
  • Real-time collaboration can be used to work across teams and locations

Mailjet drawbacks:

  • Many features cost more and aren’t available on the lower priced plans
  • Some functions require you to use tools from a third party, such as Zapier
  • Integration with other apps can be more complicated

Final Thoughts

Email has long been a must-have marketing tool for companies hoping to increase sales, retain customers, and reduce abandoned carts. While email is a central component of most marketing campaigns, its true value can only be unlocked if you choose the right email marketing service for your company needs.

There’s much to consider when choosing an email marketing service. From the number of emails you plan to spend, through to your monthly budget, you need to first have a good understanding of the essential features you need from the platform before you sign up. For agencies looking for a white label email marketing service, Instiller ticks all the boxes. This fully white label service offers competitive pricing, impressive reliability, and plenty of support, making it a top choice.