Blastengine Mailer MCP Server

Sends emails via the Model Context Protocol. Exposed over MCP by the blastengine mailer mcp server, that capability becomes something an assistant can invoke while it works, not something you go and do afterwards.

What it actually does

Blastengine APIを使用してメールを送信するModel Context Protocol (MCP) サーバー

Its toolset

Everything the assistant can do here goes through one of these:

• send_email — Blastengine APIを使用してメールを送信
• from — 送信元メールアドレス
• subject — メールの件名
• text — メール本文

Adding it to your client

Setup follows the usual MCP pattern — install or clone the server, register it in your client's configuration file, restart the client.

Configuration

You will need 2 environment variables: BLASTENGINE_USER_ID, BLASTENGINE_API_KEY. The server will not start without them, which is usually why the tools fail to appear on a first run. Keep credentials in your client's env block or a secrets manager rather than in a file you might commit.

When to reach for it

Among the developer tooling options, the useful question is rarely "what can it do" but "what does it cost you to run" — permissions, credentials, and how much of your context its toolset consumes. Blastengine Mailer's toolset — send_email, from, subject and 1 more — is a fair guide to whether it matches your workflow. It is maintained by r3-yamauchi; worth a glance at recent repository activity before you build anything load-bearing on it.

This entry was verified against Blastengine Mailer's own documentation before publication; SyncDev keeps the directory reviewed rather than auto-generated.

Caveats

• It runs with your machine's permissions. That is convenient and also the reason to think about what you point it at before you approve a tool call.
• Missing credentials fail quietly in some clients — if no tools show up, check the environment block first.
• MCP clients confirm each tool call by default. Leave that on until you have watched what the blastengine mailer mcp server does with a few real requests.