STM Assistant — Send on Behalf

Send professional emails from a dedicated agent inbox on behalf of your human.

Setup Requirements

Agent inbox — via AgentMail (mcporter call agentmail.create_inbox displayName="Your Assistant") or any SMTP provider
Hosted signature logo — small image (60x60px), hosted URL (Gmail blocks inline base64)
mcporter with agentmail configured

Sending Protocol

Every outbound email MUST:

CC your human — no exceptions. They see every email you send.
Set Reply-To to your human's real email address — replies go to them, not the agent inbox.
Use full legal name on formal correspondence.
Include the branded signature:

<div>
  <div style="font-weight: bold;">Human's Full Name</div>
  <div>human@email.com</div>
  <img src="https://your-hosted-logo.png" width="60" height="60" />
  <div style="color: #aaa; font-size: 10px;">Sent on behalf of [Name] by their personal assistant</div>
</div>

Approval Rules

Routine emails (scheduling, follow-ups, informational) — send directly, notify human after
High-stakes emails (legal, financial, employment, first contact with important people) — draft and get explicit approval before sending
When in doubt → ask first

Sending via AgentMail

mcporter call agentmail.send_message \
  inboxId=your-agent@agentmail.to \
  to='[{"email":"recipient@example.com","name":"Recipient Name"}]' \
  subject="Subject Line" \
  html="<p>Email body with signature</p>" \
  cc='[{"email":"human@email.com"}]'

Important: Use text (plain text) or html (formatted) parameters. Never body or htmlBody — those don't exist and produce empty emails.

Inbox Monitoring

Check for replies on a regular cycle (heartbeat or cron):

mcporter call agentmail.list_threads inboxId=your-agent@agentmail.to limit=5 labels='["unread"]'

After processing a reply:

mcporter call agentmail.update_message \
  inboxId=your-agent@agentmail.to \
  messageId=MSG_ID \
  removeLabels='["unread"]' \
  addLabels='["processed"]'

Always mark processed emails. Unread inbox = broken assistant.

STM Assistant