Posylai — AI Email Builder

Posylai MCP — AI Email Builder

Build production-ready HTML email campaigns from any brand website.

Posylai MCP lets Claude, Cursor, Codex and other MCP-compatible agents analyze a brand website, build an email design system from it, assemble responsive campaigns, QA the rendering and export production HTML.

Remote MCP endpoint

https://mcp.posylai.ru/mcp

Transport: streamable HTTP. Authentication: personal bearer token.

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What it does

Most email tooling starts from a blank template. Posylai starts from the brand's own website: it reads the real markup — typography, palette, spacing rhythm, button shapes, image treatment — and turns it into a reusable master template. Campaigns are then assembled from that template's blocks, so every email looks like the brand instead of like a generic newsletter.

The rendered result is checked before it is handed back: mobile column, alt texts, unsubscribe link, message weight, appearance across mail clients.

Typical timings on our pipeline: ~15 minutes to build a master template from a site, ~10 minutes per campaign after that.

Getting a token

1. Register at https://posylai.ru/login.html#reg — the password is emailed to you.
2. Sign in to https://posylai.ru/account/.
3. Issue an MCP token there.

Tokens are per user, not per server: the endpoint answers nothing without a valid one, and revoking a token in the dashboard takes effect immediately without affecting anyone else.

The first template is free.

Client configuration

Claude Code

claude mcp add --transport http posylai https://mcp.posylai.ru/mcp \
  --header "Authorization: Bearer YOUR_TOKEN"

Claude Desktop, Cursor, VS Code, Codex, Windsurf

{
  "mcpServers": {
    "posylai": {
      "type": "http",
      "url": "https://mcp.posylai.ru/mcp",
      "headers": {
        "Authorization": "Bearer YOUR_TOKEN"
      }
    }
  }
}

Per-client file locations are in examples/.

Any client that speaks streamable HTTP MCP with a bearer header will work; there is nothing client-specific in the server.

Typical flow

Step	Tool	What happens
1	unified_brands	List brands already set up
2	unified_brand_design_code	Extract the visual language from a website
3	unified_brand_sketch	Draft a master template prototype
4	unified_brand_create	Create the brand from the prototype
5	unified_plan_start	Assemble a campaign from a brief
6	unified_job_status	Poll until it is ready
7	unified_render	Render the email to images
8	unified_gate	Pre-send checks
9	unified_export	Take the production HTML

Status tools report progress, so an agent never has to wait blind.

Tools — 29 total

Brand and style (9) unified_brands · unified_design_system · unified_brand_questionnaire · unified_brand_design_code · unified_brand_sketch · unified_brand_sketch_status · unified_brand_sketch_edit · unified_brand_brief_submit · unified_brand_create

Campaign build (6) unified_masters · unified_plan_start · unified_job_status · unified_apply_dc · unified_render · unified_rerender

Quality checks (4) unified_qa_report · unified_qa_run · unified_gate · unified_section_images

Edits (9) unified_slot_set · unified_section_get · unified_section_put · unified_section_update · unified_fix_finding · unified_section_disable · unified_upload_asset · unified_dc_get · unified_dc_put

Export (1) unified_export

What it does not do

Worth stating plainly so an agent does not plan around it:

• It does not send campaigns to a list. It returns HTML; sending happens through your ESP — Unisender, Sendsay, Mindbox, Mailganer or any other.
• It does not store subscribers and does not segment them.
• It does not invent a visual identity. The style is taken from the brand's site or brand book, not made up.

Discovery

Machine-readable manifest, open without a token:

https://mcp.posylai.ru/.well-known/mcp.json

Human documentation: https://posylai.ru/mcp/

Support

[email protected]

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По-русски

Posylai MCP даёт ИИ-агентам 29 инструментов для сборки email-писем по адресу сайта бренда: снять фирменный стиль, собрать мастер-шаблон, сформировать письмо по заданию, проверить вёрстку и забрать готовый HTML.

Адрес сервера — https://mcp.posylai.ru/mcp, транспорт streamable HTTP, авторизация личным токеном. Токен выпускается в личном кабинете после регистрации; первый шаблон бесплатный.

Токен привязан к учётной записи: без действующего токена сервер не отвечает. Отозвать его можно в кабинете, старый перестаёт работать сразу.

Сервер не рассылает письма по базе и не хранит подписчиков — он отдаёт готовый HTML, а отправка идёт через ваш сервис рассылок. Подробная документация на русском: https://posylai.ru/mcp/

License

MIT — see LICENSE.

This repository contains the public manifest, documentation and client configuration examples. The server itself is a hosted service.