# day3.app

> day3.app — mopra-day3-app. Use this tool when you need to manage marketing and transactional emails for small SaaS teams, streamlining email sends and transactions through its REST API, webhooks, and MCP server. It solves problems of email management and scalability, providing a cost-effective solution billed by sends. Ideal for small SaaS teams, it offers a source-available platform with git integration for seamless development and deployment.

Canonical page: https://skillsregistry.net/skills/mopra-day3-app  
JSON: https://api.skillsregistry.net/v1/skills/mopra-day3-app

## Description

Day3: marketing and transactional email for small SaaS teams, billed by sends. The app at go.day3.app, its REST API, webhooks, MCP server and send worker. Source-available.

## Trust

- **Trust score (0–1):** 0.69
- **Verification tier:** scanned
- **Last scanned:** 2026-09-28

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** container
- **Runtime environment:** vm
- **Updated:** 2026-09-28

## Source

- **Source listing:** [GitHub](https://github.com/Mopra/day3.app)

## Use it

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "mopra-day3-app"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/mopra-day3-app` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/mopra-day3-app/pull`

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SkillsRegistry indexes agent skills from public registries and GitHub. Skills we have analysed are scanned with Circle-IR and scored on six dimensions; each listing states its scan coverage. More: https://skillsregistry.net/llms.txt