Email Follow-ups for Fixie AI Agents

Give Fixie agents the ability to send email follow-ups after conversations — with MultiMail's oversight ensuring voice-to-email handoffs are reviewed before delivery.

Fixie is a platform for building and deploying AI agents with managed infrastructure, focusing on voice AI and real-time interactions. When Fixie agents handle customer conversations, they often need to send follow-up emails — meeting summaries, action items, or support ticket confirmations. MultiMail provides this email layer with built-in oversight.

MultiMail's gated_send mode is essential for voice-to-email handoffs. An agent might generate an email summary of a phone call, but the transcription or summarization could contain errors. Gating the send ensures a human reviews the email content before it reaches the customer.

Integration uses Fixie's tool system to register MultiMail API endpoints as callable tools within your agent's workflow.

Why MultiMail

Built for Fixie developers

Safe Voice-to-Email Handoffs

Fixie voice agents may generate email content from call transcriptions. MultiMail's gated_send mode ensures these generated emails are reviewed before delivery, catching transcription or summarization errors.

Conversation Follow-up Automation

After a Fixie agent handles a customer interaction, it can automatically draft follow-up emails with action items. MultiMail queues these for human review, ensuring accurate and professional communication.

Managed Infrastructure Alignment

Both Fixie and MultiMail provide managed infrastructure. Fixie handles agent hosting and execution, MultiMail handles email delivery and oversight — no self-hosted components needed.

Thread Continuity Across Channels

When a conversation moves from Fixie's voice channel to email, MultiMail's thread tracking maintains continuity. The customer sees a cohesive conversation thread regardless of the channel transition.

Try it

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. Read https://multimail.dev/llms.txt first, then connect the MultiMail MCP server exactly as described there. Create a free MultiMail inbox for this Fixie agent and set up a verified sending domain before enabling any outbound email. 2. In the Fixie agent, wire MultiMail through Fixie’s built-in tool/function integration mechanism. Expose the connected MultiMail MCP tools to the agent; do not add custom email endpoints, webhooks, or direct delivery code. 3. Give the agent three email abilities only: check the MultiMail inbox for new or relevant messages, draft replies or follow-up emails in the agent’s normal voice, and compose/send or schedule email through MultiMail. 4. Send one test email from the verified sender to a developer-controlled address. The message should identify the Fixie conversation it came from, summarize the handoff, and confirm that replies should return to the MultiMail inbox. 5. Keep MultiMail in gated_send oversight mode for this agent. Every outbound email, including the test email, must be presented for developer review and approval before MultiMail sends it; do not switch to monitored or autonomous until the handoff behavior has been reviewed.
Getting started

Step by step

1

Create a MultiMail Account and API Key

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

2

Install Fixie SDK

Install the Fixie SDK for building your agent.

3

Define Email Tool Functions

Create functions that call the MultiMail REST API for sending emails, checking inboxes, and replying to threads. Register these as tools available to your Fixie agent.

4

Wire Up Post-Conversation Hooks

Configure your Fixie agent to call the email tools when conversations end, generating and queuing follow-up emails for human review.

5

Approve Pending Emails

Review follow-up emails in the MultiMail dashboard. Approve after verifying the content accurately reflects the conversation.

FAQ

Common questions

Can Fixie voice agents send emails during a call?
Yes. Your Fixie agent can call the MultiMail API at any point during a conversation to send or queue an email. In gated_send mode, the email is queued for human review rather than sent immediately, so the agent can promise a follow-up without the email going out unreviewed.
How do I handle transcription errors in follow-up emails?
Use MultiMail's gated_send mode to create a review step. When a Fixie voice agent generates a conversation summary email, it's queued for a human to review before delivery. The reviewer can correct any transcription errors, ensuring the customer receives accurate information.
Can Fixie agents read incoming emails during conversations?
Yes. Use the check_inbox and read_email tools to give your Fixie agent access to email context during a live conversation. This allows the agent to reference past email exchanges while speaking with a customer, providing more informed responses.
Does MultiMail support real-time email notifications for Fixie?
MultiMail supports webhooks that can notify your Fixie agent when new emails arrive. Configure a webhook in MultiMail pointing to your Fixie agent's endpoint, and the agent can respond to incoming emails in real time.
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The only agent email with a verifiable sender

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