Posylai — AI Email Builder

ru.posylaiPublished by posylai.ruOfficial publisherv1.0.0Updated Oct 27, 2026

Build responsive HTML email campaigns from any brand website: design, QA, export.

VerifiedStreamable HTTPWeb executableBusiness & CommerceMedia & Design

Overview

AI-generated overview

Remote MCP server that lets an assistant extract a brand's visual style from its website, build responsive HTML email campaigns, QA them and export production…

What you can do
  • List and create brands, extract a design system from a website, draft and edit master template sketches
  • Assemble campaigns from a brief, poll job status, apply design codes and render or re-render emails to images
  • Run QA reports and pre-send gate checks, inspect section images
  • Edit sections and slots, fix findings, disable sections, upload assets and read or write design codes
  • Export the finished campaign as production HTML
When to use it
Useful when you want emails that match an existing brand site rather than a generic template, and need an agent to go from website to checked, exportable HTML. Suited to marketing or design workflows where the finished HTML is then sent through a separate email service provider.
Requirements
A remote streamable HTTP endpoint; no local package. A Posylai account registered on the provider's site and a personal MCP token issued in the account dashboard, sent as an Authorization bearer header. Network access to the provider's endpoint.
Before you install
The token is per user and the endpoint answers nothing without a valid one; keep it private and revoke it in the dashboard if exposed. The first template is free, so further templates or campaigns may involve payment. Tools create brands, edit sections and upload assets, changing data in your account. It does not send emails or store subscribers; sending stays with your own email service provider.

Installation

In SourceWeft

  1. Open Posylai — AI Email Builder in the dashboard and add it to a workspace.
  2. Connect the required credentials. They are stored privately and never shown on public pages.
  3. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/ru.posylai%2Femail/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config. The client completes OAuth sign-in on first connect.

{
  "mcpServers": {
    "posylai-ai-email-builder": {
      "type": "http",
      "url": "https://mcp.posylai.ru/mcp"
    }
  }
}

README

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.

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

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

Claude Desktop, Cursor, VS Code, Codex, Windsurf

json
{  "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

StepToolWhat happens
1unified_brandsList brands already set up
2unified_brand_design_codeExtract the visual language from a website
3unified_brand_sketchDraft a master template prototype
4unified_brand_createCreate the brand from the prototype
5unified_plan_startAssemble a campaign from a brief
6unified_job_statusPoll until it is ready
7unified_renderRender the email to images
8unified_gatePre-send checks
9unified_exportTake 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]

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.

Source: README.md at commit bab1ad4

Tools

0
This server asks for a credential such as an API key, so SourceWeft could not read its tools without one and has not indexed them.

Version history

1
  1. v1.0.0LatestSep 16, 2026

Score

85% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listed15 pts

    Answer tools/list without a credential, or ship a package that starts in a sandbox without one.

  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts