# Accounting Mail Workflows

> Send engagement letters, tax notice replies, invoice packets, payment-plan letters, check remittance packets, and year-end statements from software with approvals, tracking, and proof.

mailbox.bot is useful when accounting software, firm portals, AP systems, or agents need to turn accounting context into real postal mail. The software can draft the packet, route it for approval, send first-class or certified mail, and attach photos, tracking, timestamps, approvals, and webhook events back to the client, vendor, invoice, or notice record.

mailbox.bot does not provide tax or accounting advice. It handles the physical mail execution and proof layer.

## Strong fits

- IRS or state notice replies
- Client engagement letters
- Invoice packets and overdue bill notices
- Payment-plan correspondence
- Check remittance cover letters
- Organizer packets and year-end statements
- Accounting firm workflows that need partner or client approval before mail is sent

## Workflow

1. A tax notice, invoice, engagement packet, client deadline, or inbound scan creates the trigger.
2. The agent or accounting system drafts the letter and packet.
3. mailbox.bot previews cost, recipient, return address, mail class, and proof metadata.
4. A human approves sensitive mail such as certified notices, disputes, payment letters, or tax correspondence.
5. mailbox.bot prints, stamps, mails, tracks, and returns lifecycle webhooks.
6. The accounting system updates the client, vendor, invoice, or notice record.

## API and agent surfaces

- REST API: https://mailbox.bot/api-docs
- MCP tools: https://mailbox.bot/api/mcp/tools
- Agent discovery: https://mailbox.bot/for-agents
- AgentMail pairing: https://mailbox.bot/docs/agentmail
- Business mail workflow: https://mailbox.bot/workflows/business-mail

## Keywords

accounting mail API, tax notice postal workflow, invoice packet mail API, engagement letter mailing, certified mail for accounting firms, AP mail automation, year-end statement mail, accountant postal mail automation, mailbox.bot accounting workflows.