Enterprise Email Agents with Semantic Kernel

Add MultiMail's email infrastructure to Semantic Kernel plugins, giving your enterprise AI agents the ability to send, read, and manage email with full audit trails.


Semantic Kernel is Microsoft's SDK for integrating LLMs into conventional applications. It emphasizes enterprise patterns like plugins, planners, and memory, with strong support across C#, Python, and Java. MultiMail provides the email infrastructure that Semantic Kernel agents need to communicate externally through managed, auditable email channels.

Enterprise teams using Semantic Kernel need auditable AI actions. MultiMail's audit log records every email operation, and the gated approval modes satisfy compliance requirements for AI-initiated communications. By combining Semantic Kernel's plugin architecture with MultiMail's oversight modes, you get enterprise-grade email automation with appropriate human controls.

Integrate MultiMail by creating a Semantic Kernel plugin with kernel functions that call the MultiMail REST API. The plugin pattern makes email capabilities discoverable by the planner and available to any agent in your kernel.

Built for Semantic Kernel developers

Enterprise Compliance

MultiMail's audit log and oversight modes satisfy enterprise requirements for AI-initiated communications. Every email action is recorded with timestamps, agent identity, and approval status — critical for regulated industries.

Plugin Architecture Alignment

Semantic Kernel's plugin system maps cleanly to MultiMail's tool set. Each email operation becomes a kernel function within a MultiMail plugin, discoverable by the planner and composable with other enterprise plugins.

Multi-Language Support

Both Semantic Kernel and MultiMail's REST API work across languages. Whether your enterprise uses C#, Python, or Java for Semantic Kernel, the same MultiMail API endpoints power your email capabilities.

Planner-Friendly Email Operations

Semantic Kernel's planner can automatically compose email workflows from available kernel functions. The planner discovers MultiMail tools and chains them together — check inbox, draft reply, send — without manual orchestration.

Graduated Trust for Enterprise Rollout

Start pilot deployments in gated_all mode where every email action requires approval. Graduate to gated_send or monitored as the system proves reliable, and reserve autonomous mode for fully validated workflows.


Try it with your agent

No code, no dashboard. Paste this to your AI agent — it connects MultiMail, creates an inbox, and builds the flow for you.

1. Get MultiMail ready before writing code: read https://multimail.dev/llms.txt, follow its current instructions to connect the MultiMail MCP server, create a free inbox for this agent, and set up a verified sending domain or sender for outbound mail. 2. Wire MultiMail into my Semantic Kernel agent using Semantic Kernel’s plugin and function-calling model: load the connected MultiMail MCP tools as Semantic Kernel plugin functions on the Kernel used by the agent, and enable the agent’s normal automatic tool/function invocation. Do not invent custom HTTP calls, endpoints, headers, or webhook behavior. 3. Give the agent only the email capabilities it needs: checking and reading the inbox, composing or drafting replies, and sending or scheduling email through the MultiMail tools exposed by the plugin. Keep these functions named and described clearly so Semantic Kernel can choose them when the agent needs email. 4. Send one test email from the verified sender to the free inbox, then have the Semantic Kernel agent check the inbox, draft a short reply, and prepare the outbound response through MultiMail. 5. Run MultiMail in gated_send mode for this setup, so every outbound message requires my review and approval before it sends. Do not switch to monitored or autonomous mode until I explicitly approve that change.

Step by step

1

Create a MultiMail Account and API Key

Sign up at multimail.dev, create a mailbox, and generate an API key. Your key will start with mm_live_.

2

Install Dependencies

Install Semantic Kernel and an HTTP client for your language.

3

Create the MultiMail Plugin

Define a plugin class with kernel functions for send_email, check_inbox, reply_email, and any other MultiMail operations your workflow needs.

4

Register Plugin with Kernel

Add the plugin to your kernel instance and configure automatic function calling so the planner can discover email tools.

5

Run and Review

Invoke the kernel with a prompt. Review and approve pending emails in the MultiMail dashboard when using gated_send mode.


Common questions

Can I use Semantic Kernel's planner to automatically compose email workflows?
Yes. When you register the MultiMail plugin with auto function calling enabled, the planner can discover and chain email operations automatically. It can compose multi-step workflows like checking inbox, reading a specific email, drafting a reply, and sending it — all from a single natural language prompt.
Does the MultiMail plugin work with Semantic Kernel in C#?
Yes. MultiMail's REST API is language-agnostic, so you can create equivalent plugins in C#, Python, or Java. The plugin pattern is the same across languages — define kernel functions that call MultiMail endpoints with HttpClient or requests.
How does MultiMail's audit log support enterprise compliance?
Every email operation — sends, reads, replies, contact changes — is recorded in MultiMail's audit log with timestamps and API key identity. This provides the audit trail that regulated industries require for AI-initiated communications, complementing Semantic Kernel's own telemetry.
Can I use Semantic Kernel's memory with email history?
Yes. You can populate Semantic Kernel's memory with email data fetched from MultiMail's API. This lets the agent recall past conversations and context when composing new emails, providing a richer understanding of ongoing relationships and prior commitments.
What oversight mode should I use for enterprise deployments?
Start with gated_all mode for initial enterprise pilots, which requires approval for all email actions including reads. Move to gated_send once the team is comfortable, which only gates outbound messages. For mature, validated workflows, monitored mode provides visibility without blocking delivery.

Explore more

The only agent email with a verifiable sender

Email infrastructure built for AI agents. Verifiable identity, graduated oversight, and a hosted MCP server. Formally verified in Lean 4.