Top Email Marketing Agencies
Email marketing agencies that design, build, and optimise campaigns and automations to nurture leads and drive repeat revenue.
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Guide to hiring a Email Marketing agency
Email remains the highest-ROI digital marketing channel, delivering an average of £36 for every £1 spent. A specialist email marketing agency helps you build engaged subscriber lists, automate customer journeys, and turn email into a reliable revenue driver.
What is Email Marketing?
Email marketing covers campaigns (newsletters, promotions, announcements), automated flows (welcome series, abandoned cart, post-purchase, win-back), and transactional emails. Sophisticated agencies also handle list segmentation, deliverability management, A/B testing, and email design systems. Platforms like Klaviyo, HubSpot, Mailchimp, Brevo, and Salesforce Marketing Cloud each suit different business types and budgets.
When should you hire a Email Marketing agency?
Email marketing agencies are most valuable when you have a meaningful subscriber list (5,000+) but are undermonetising it, when your automation flows are basic or non-existent, when deliverability is suffering, or when you want to build a sophisticated segmentation and personalisation strategy. eCommerce businesses in particular often find huge untapped revenue in email.
What to look for in a Email Marketing agency
- Platform expertise on your specific ESP (Klaviyo, HubSpot, etc.) — setup and migration experience
- Deliverability knowledge — domain authentication, list hygiene, suppression management
- Design capability — responsive templates, consistent brand voice, accessible HTML emails
- Automated flow experience — can they build and optimise complex multi-step journeys?
- Revenue attribution — do they tie email activity to actual revenue, not just open rates?
How much does Email Marketing cost?
Email marketing retainers typically range from £800–£2,500/month for campaign management and basic automation, up to £5,000–£12,000/month for comprehensive programmes covering advanced flows, segmentation, and platform management. One-time automation setup projects (e.g., building a full Klaviyo flow library for eCommerce) often run £3,000–£10,000.
Frequently asked questions about Email Marketing agencies
What's a good email open rate?
Average open rates vary significantly by industry and whether you measure by unique opens or total opens, but 25–40% is generally considered healthy for engaged lists. More important is click-to-open rate (CTOR) and revenue per email — these indicate whether your content is actually driving action.
How often should I email my subscribers?
For most businesses, 1–4 emails per month for marketing campaigns, plus automated flows triggered by behaviour. Over-emailing causes unsubscribes and spam complaints; under-emailing means subscribers forget who you are. Test frequency with different segments to find your optimum.
What's the difference between a campaign and an automation?
Campaigns are one-time sends (promotions, newsletters) sent to a segment at a specific time. Automations (also called flows or sequences) are triggered by subscriber behaviour — signing up, making a purchase, abandoning a cart — and run continuously without manual effort.
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