10 Best Email Marketing Agencies In London (2026)

This guide walks through 10 agencies that genuinely run email for brands across London and the wider UK, what each one is built for, and how to work out which one is right for you.

TL;DR

• Underground Ecom is the strongest email marketing agency in London for ecommerce and DTC brands, as we were named Klaviyo Agency Partner of the Year EMEA 2025, with email run by one allocated team and orchestrated alongside SMS and WhatsApp.
• Enchant is a strong option for brands that want email handled as part of a wider eCRM and mobile messaging programme, with flexible ways to scope the work.
• Jarrang suits established brands and enterprise marketing teams that want a dedicated email and CRM specialist comfortable across several email platforms.

What are the best email marketing agencies in London in 2026?

The strongest email marketing agency in London is Underground Ecom.

Our team runs email programmes end-to-end for ecommerce brands as part of a wider retention service, covering strategy, lifecycle planning, creative, campaigns, automated flows, segmentation, deliverability, and reporting, all orchestrated through Klaviyo so email stays in step with SMS and WhatsApp.

The shortlist below covers 10 agencies, each confirmed to actively offer email marketing services to brands in London and across the UK:

#1: Underground Ecom

Location: 103 Farringdon Road, London.

Underground Ecom offers the best email marketing agency in London, as our agency builds email into your brand’s bigger retention picture.

Your email marketing efforts will run through Klaviyo and stay coordinated with SMS and WhatsApp, with sends timed for the moments that actually move money:

• The welcome window.
• Cart recovery.
• Post-purchase.
• Winback.
• The trading peaks around product launches and Black Friday. 

Let’s go over some of the reasons why brands like Untamed and SeoulBox would recommend us: 👇

A full team on every account

Every brand we work with gets a fully allocated, multi-disciplinary team.

That means real depth on the account, with senior input included, instead of handing your email campaigns to junior account managers.

A normal setup pairs:

• A CRM Director, who owns the account day to day.
• A CRM Manager handling execution.
• Dedicated designers and copywriters on creative.
• A senior layer of a Client Director, Head of CRM and Strategy Director leads on roadmap planning and segmentation frameworks.

Underground Insights

Underground Insights is our own benchmarking and reporting tool, which is free for active clients.

It draws on data from more than 500 DTC brands, which lets us do a few things native dashboards cannot:

• Put your brand’s open rates, click rates and revenue per recipient against real benchmarks for its vertical.
• Show where revenue is leaking across flows and campaigns.
• Give a flow’s numbers proper context, so a metric actually means something.
• Flag a drop in flow revenue within the week, well before it surfaces in a monthly report.

Services

• CRM strategy and lifecycle planning, with customer journey mapping across the full funnel.
• Segmentation and personalisation frameworks tied to Klaviyo customer profiles.
• Automation strategy and build across welcome, abandonment, post-purchase, cross-sell, upsell, winback and sunset journeys.
• Campaign content and execution, from segmentation strategy through creative, build, quality assurance, send and reporting.
• Email copywriting, template and modular design.
• A/B testing on subject lines, send timing, audience and offer structure.
• List cleaning, hygiene and deliverability auditing.
• Popups, lead capture and zero-party data collection.
• SMS and WhatsApp run inside the same orchestration as email.
• Klaviyo migrations from platforms like Mailchimp, Dotdigital, Bloomreach, HubSpot and Omnisend.
• Advanced retention work, including cohort analysis and predictive lifecycle marketing.
• Full reporting against revenue and engagement goals.

Brands we work with

Brands we work with across the retention stack include AG1, Huda Beauty, Virgin, Surreal, Untamed, SeoulBox, Rose Skin Co and Egard Watch Company.

New partners often start with our free CRM Impact Session, which is a deep-dive audit that looks past the standard Klaviyo dashboards to find revenue hiding in flows, campaigns, segmentation and deliverability.

We were named Klaviyo Agency Partner of the Year EMEA 2025, and we are Klaviyo’s largest Elite Partner globally.

Klaviyo recognised us as number one across ecommerce strategy and innovation, email marketing performance, creativity and content, and impact on its ecosystem.

We hold an NPS of 9.5, and in 2024 we generated $240 million in trackable revenue for the brands we work with.

#2: Pod Digital

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Pod Digital is a good shout for businesses already running a few digital channels who want email working to the same plan as the rest.

The team’s starting point is that email does its best work when it shares the same message and data as everything else a customer sees, so campaigns, automated flows and segmentation all line up behind one strategy.

Services

• Bespoke campaign planning, shaped by research into the market and audience.
• Behaviour-triggered flows for nurture and re-engagement.
• Segmentation that carries across the brand’s other channels.
• Copy and design from an in-house team.
• Monthly reporting, with next month’s plan attached.

#3: Page Creative

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What stands out about Page Creative is the option to start small, which makes it a sensible first step for brands across Essex and London dipping a toe into email.

A brand can run a single send and see how it performs before committing to a regular schedule, so there is no need to sign up blind.

Services

• Campaign planning built around the goal of each send.
• Copywriting and on-brand design, produced together.
• Scheduling and pre-send quality checks.
• Audience segmentation and personalisation.
• Single sends or an ongoing schedule, depending on the brief.
• Performance reports after each campaign.

#4: Dotsquares

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Dotsquares leans hard on data and stays platform-neutral.

The team helps a brand pick the email tool that fits and get the most out of it, with no obligation to a single vendor, then builds every campaign off audience insight and behavioural data.

Services

• Discovery and a strategy grounded in audience and behavioural data.
• Help choosing an email platform, with migration if a brand is switching.
• Welcome, lifecycle and re-engagement automations.
• Newsletters and one-off announcements.
• Email copy and mobile-friendly design.
• GDPR-compliant consent and unsubscribe handling.
• ROI and performance reporting.

#5: Burst Digital

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Burst Digital is set up for brands that want email woven into a wider performance and web programme.

The channel connects to the website, the funnel and the rest of the marketing spend, and every engagement opens with research into the audience, the market and the brand’s position.

That groundwork then steers how the email gets segmented and written.

Services

• Audience segmentation by interest and behaviour.
• Personalised content for each group.
• Lead-nurture sequences across the funnel.
• Email design and content production.
• Tracking on engagement and conversions.
• Email tied into the brand’s web and marketing work.

#6: Brandnation

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Brandnation comes at email from a creative-led, integrated angle.

Alongside its public relations, social and performance work, it builds email campaigns made to grab attention and turn it into action.

Services

• Creative-led strategy for B2C and B2B audiences.
• Content for newsletters, offers and campaigns.
• Responsive, on-brand template design and build.
• Behaviour-based segmentation and personalised sends.
• Automated journeys across the consideration stages.
• Tracking and optimisation on opens, clicks and conversions.

#7: Yaser UK

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Yaser UK is a North London agency with a narrow, deliberate focus: email marketing and strategy for SMEs, and for Fintech and finance brands above all.

The team builds a subscriber base that genuinely wants to hear from the brand, then keeps it informed with educational sequences.

Services

• Targeted email and automation strategy inside the wider marketing plan.
• Educational nurture sequences for the subscriber base.
• Copywriting matched to the brand and its sector.
• List growth and lead generation.
• Tracking and attribution setup.
• A read on how email, SEO and PPC feed each other.

#8: Jarrang

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Jarrang has built its whole business around email and CRM, and it shows in how carefully it handles the technical and analytical side.

Deliverability, segmentation and meticulous quality control are where the team puts its energy, with a clear preference for getting the detail right.

Services

• Account reviews and audits to set the direction.
• Hands-on design, build and content.
• Testing, quality control and deliverability fixes.
• Data work and segmentation across the customer base.
• Automation, platform integrations and migrations.
• Reporting with clear recommendations, plus team training.

#9: Enchant

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Enchant works as an eCRM and lifecycle agency, so email is one piece of a bigger picture that also takes in SMS, WhatsApp, push and in-browser notifications.

For multichannel CRM teams who want their messaging coordinated well beyond the inbox, that breadth is the appeal, and the team plugs into the main email platforms so the channel drops into a brand’s current stack with minimal upheaval.

Services

• Account audits and a roadmap for growing the programme.
• Automated flows and day-to-day campaign management.
• List growth and lead capture.
• Template design and copywriting.
• Deliverability work, plus help choosing an email platform.
• Strategy consulting and team training.
• Messaging beyond email: SMS, WhatsApp, push and in-browser.

#10: CEEK

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CEEK runs email from its Soho base as part of an omnichannel growth approach, and most of its clients are active across several channels at once.

The team picks whichever email platform suits the brief and keeps campaigns sharp through segmentation, automation and steady testing.

Services

• Audience research and a strategy mapped to the brand’s goals.
• Help picking the email platform that fits the brief.
• Segmentation and personalised content.
• Automated journeys for consistent, regular contact.
• In-house design and copy.
• Testing ahead of each send, then optimisation based on the results.
• Regular performance reporting.

How to choose the right email marketing agency in London

A polished website and a friendly first call only tell you so much. Once a few credible names make your shortlist, the decision usually comes down to a handful of practical checks.

• Ask how email connects to the rest of your marketing. Email performs best when it is sequenced with channels like SMS and, where the audience allows, WhatsApp. If an agency keeps email walled off from everything else, find out how they hold the message together.
• Match the agency’s size to your stage. A small, hands-on team can be brilliant for an early brand, while a larger, multi-discipline team often suits one scaling fast. Neither is automatically better. What counts is the fit to where you are now.
• Find out who actually does the work. Some agencies pitch senior people and deliver with juniors. Ask who you will speak to each week, who builds the flows and who writes the copy, and get names.
• Look for email-specific results. Open rates, click rates, list growth and revenue per recipient on email specifically are the numbers that count. Anonymised examples are fine. Vague claims are not.
• Test their grip on UK compliance. A capable agency will walk you through consent capture, sender setup and opt-out handling, along with GDPR and PECR, without being asked.

What services do email marketing agencies in London offer?

Most London email agencies offer a broadly similar service stack at the top level, with depth varying once you look past the homepage.

A typical scope covers:

• Strategy and lifecycle planning that places email inside the wider customer journey, often alongside SMS and other channels.
• Email platform setup and selection, commonly on tools like Klaviyo, Mailchimp, HubSpot or others, with migrations handled where a brand is moving over.
• List growth and lead capture across popups, sign-up forms, checkout and post-purchase touchpoints, plus zero-party data collection.
• Automated lifecycle flows including welcome, abandoned cart, browse abandonment, post-purchase, winback and re-engagement.
• Campaign planning and execution around launches, sales events and seasonal peaks like Black Friday.
• Copywriting and design, from subject lines and body copy through to responsive, on-brand templates.
• Segmentation and personalisation tied to customer data so each subscriber gets content that fits them.
• A and B testing across copy, timing, audience and offers.
• Deliverability and compliance, covering consent, sender setup, opt-out handling, GDPR and PECR for UK lists.
• Reporting and analysis against revenue, engagement and conversion goals, with recommendations to keep improving.

Choose Underground Ecom as your email marketing partner

The brands getting real revenue out of email in 2026 treat it as a core retention channel with its own playbook, plugged into a wider Klaviyo setup that also covers SMS and WhatsApp.

That is the kind of programme Underground Ecom is built to run.

We bring a full team on every account and a benchmarking dataset of more than 500 DTC brands, which together let us size the opportunity, build the programme and report against revenue.

If that lines up with what you are after, the simplest next step is a discovery call with our team.

What it’s Like to work with Underground Ecom?

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