HTML Email Development Services
Pixel-Perfect Emails That Render Everywhere
We build responsive HTML email templates that render flawlessly across Gmail, Outlook, Apple Mail, and 90+ email clients. From campaign templates to full transactional email suites — hand-coded, tested, and ready to deploy.
Skills & Platforms
We code for every major ESP and test across every major email client — no exceptions.
Engagement Options
From a single template to a full retainer — we fit around your send schedule.
One-Off Template
A single HTML email template designed, coded, and tested across 90+ clients. Perfect for a hero campaign or a transactional trigger.
Template Suite
A set of 5–20 branded email templates: welcome series, cart abandonment, receipts, newsletters, and more — built to a consistent design system.
Ongoing Retainer
Monthly HTML email development support for teams who send regularly — new templates, template edits, A/B variants, and dark-mode updates.
Why Choose 1Solutions for HTML Email Development?
We build emails that survive the inbox — Outlook, dark mode, mobile, and everything in between.
Outlook-Proof Coding
Outlook uses Microsoft Word's rendering engine, which breaks modern CSS. We use MSO conditional comments, VML, and table-based layouts that look perfect in Outlook 2007–2023.
Dark Mode Ready
40%+ of users read email in dark mode. We code media query overrides that preserve your brand in dark environments — not just let Outlook invert your colours.
90+ Client Testing
Every template is tested in Litmus or Email on Acid across Gmail, Outlook, Apple Mail, Samsung Mail, and Thunderbird before delivery.
Responsive on Every Device
Fluid-hybrid layouts that adapt from 600px desktop to 320px mobile without breaking your header, hero, or CTA.
ESP-Ready Delivery
Templates delivered in your ESP's format — Klaviyo drag-and-drop blocks, Mailchimp editable regions, HubSpot custom modules, or raw HTML.
Accessibility First
Semantic HTML, role="presentation" on layout tables, ALT text on all images, and sufficient colour contrast — so your emails work for screen reader users too.
Our Email Development Process
Brief to inbox-tested delivery in 4 steps — no shortcuts, no builders, no broken rendering.
Brief & Design
We review your brand guidelines, ESP, and email objectives — then produce a design mockup for approval before any coding begins.
Code & Build
We hand-code the template using table-based HTML, MSO conditionals, and fluid-hybrid responsive techniques — no drag-and-drop shortcuts.
Cross-Client Testing
We test the coded template across 90+ email clients in Litmus, verify dark mode behaviour, and check plain-text rendering.
Deliver & Deploy
We deliver the template in your ESP's format — with editable regions, content blocks, and a handoff guide — ready to send.
Frequently Asked Questions
Common questions about our HTML email development services.
Ready to Build HTML Emails That Actually Render?
Tell us your ESP, send volume, and template needs — we'll quote within 24 hours and deliver your first template in under a week.
Get a Free Template Quote →