---
title: Mailbox management
description: Enrolling mailboxes, sync state, and what removing one does not delete.
sidebar:
  label: Mailboxes
  order: 3
---

Enrols a shared or personal mailbox against an office, shows sync state
(last run, consecutive failures, last error), and lists delivered messages
once mail is writing rows.

## Rules that surprise people

- **Only enrolled mailboxes are synced** (R46).
- **One mail process** holds a single Graph delta cursor per mailbox. Two
  instances would fight over the cursor.
- **Removing a mailbox does not delete its conversations** (R48). They stay
  reachable; the mailbox just leaves enrolment.
- **Outbound reply-to is the shared office mailbox** even when the engineer
  is the from (R55). Customers reply to an address FlowOS syncs.
- **Internet message ids of sent mail are recorded** (R56). Without that,
  delta sync would ingest our own quotation as a new inbound document.

## Who uses it

Administrators (Email Management, employee mailbox panel). Sales people work
what arrived; they do not add mailboxes.

Related: [Collecting mail](/business/workflows/collecting-mail) ·
[Connected systems](/business/connected-systems).