SELISE Digital Platforms introduces Blocks MailCraft, an open-source drag-and-drop E-Mail editor that gives businesses a modern way to create, customize, and manage E-Mail templates, without subscription fees, vendor lock-in, or proprietary template formats.
For businesses that rely on email as part of their marketing, product, or customer communication, building and managing email campaigns often means working within the limitations of third-party email editors. Subscription fees can increase with users and usage, advanced branding capabilities may sit behind enterprise tiers, and templates can become tied to a vendor’s ecosystem.
Blocks MailCraft takes a different approach.
Built as part of the SELISE Blocks ecosystem, MailCraft is a free, MIT-licensed email editor that can be embedded directly into business applications and products. It gives teams the flexibility to build email experiences around their own systems, infrastructure, brand, and workflows while keeping the resulting templates in portable HTML.
The challenge: email creation shouldn’t mean giving up control
Modern email editors have made campaign creation easier, but businesses can still face several challenges:
- Recurring tooling costs that grow with users and usage.
- Vendor dependency when templates and workflows are tied to a specific platform.
- Limited customization when advanced branding and white-label capabilities require higher-tier plans.
- Infrastructure dependency when campaign assets are stored on third-party platforms.
- Integration constraints when an editor is designed to work primarily within its own ecosystem.
- Build-versus-buy complexity for software companies that want to offer email creation as part of their own products.
For enterprises and software companies, the question is no longer simply “Which email editor should we use?” It is also “How much control do we want to retain?”
The solution: an email editor you can make your own
Blocks MailCraft puts the editor inside your environment, not the other way around.
Businesses can integrate MailCraft directly into their applications, customize its experience, connect it to their own infrastructure, and use the resulting HTML with the email-sending platform of their choice.
Templates are created and exported as standard HTML email. The same HTML can be loaded back into the editor, giving businesses a straightforward way to retain and manage their templates outside a proprietary format.
That means organizations can build their email library without making the editor itself a dependency.
There is no subscription fee for the editor and no requirement to adopt a separate sending infrastructure.
The project also maintains automated testing around template round-trip fidelity, helping ensure that templates can move through the editor without losing the configurations users have created.
Built around your brand and infrastructure
MailCraft is designed to fit into an organization’s existing technology ecosystem rather than requiring the organization to adapt to another platform.
White-label the experience
Remove the SELISE footer and tailor the editor experience to your own product and brand.
Match your brand
Configure accent colors, fonts, themes, and other visual elements to align with your existing design system.
Keep your assets where you want them
Connect image uploads to your own backend or keep them local to the draft. MailCraft does not require assets to pass through a proprietary backend.
Bring your own AI
MailCraft’s optional AI drafting capabilities can connect to an AI provider supplied by you, giving organizations control over their model, credentials, and associated costs.
Build for global audiences
With support for 31 languages and automatic right-to-left support, MailCraft is designed for products serving multilingual and international audiences.
Connect to your existing email workflows
Merge tags and conditional content can be exported using familiar syntax such as {{first_name}} and {{#if}}, allowing templates to work with existing sending and personalization workflows.
More than an email editor
For companies building software that sends emails on behalf of customers, MailCraft can become a product capability rather than another standalone SaaS subscription.
Instead of building an email editor from scratch, development teams can integrate an existing open-source component and focus their engineering resources on the parts of the product that differentiate their business.
MailCraft addresses many of the underlying challenges involved in building a production-ready email editor, including:
- Drag-and-drop email creation
- HTML import and export
- Template editing and reuse
- Email-specific styling controls
- Undo and editing history
- Localization and RTL support
- Image handling
- Personalization and conditional content
- Email-client compatibility considerations
The result is a ready-to-integrate email editing capability that businesses can adapt to their own products and workflows.
Open source by design
MailCraft is part of the broader SELISE Blocks approach to building reusable enterprise software components.
Rather than treating every capability as a closed commercial product, SELISE is making selected Blocks components available under the MIT license, allowing organizations and developers to inspect the code, adapt it, integrate it, and contribute to its development.
For businesses, that creates a different kind of technology relationship: one where the underlying component is transparent, auditable, and not dependent on a commercial license to remain operational.
Why MailCraft matters
For marketing teams, MailCraft can mean more control over how email experiences are created and branded.
For product teams, it provides an embeddable email-building capability.
For engineering teams, it offers an open-source foundation instead of starting an email editor from zero.
And for enterprises, it provides a path to email tooling where ownership, portability, and infrastructure control remain with the business.
No editor subscription. No proprietary template format. No forced infrastructure. Just an email editor you can build into your own ecosystem.
Explore Blocks MailCraft
Blocks MailCraft is available to try directly in the browser, with the source code and documentation publicly available.
