---
title: "One address book"
description: "Everyone works from the same contacts, and your code and agents read the same rows."
url: "https://nextmail.sh/features/shared-contacts"
---

Inboxes a team works

# One address book for the whole team

Everyone works from the same contacts, and your code and agents read the same rows.

[Open mail](https://nextmail.sh/mail/inbox) [Get Started](https://nextmail.sh/signup.md)[Every walkthrough](https://nextmail.sh/features/in-practice.md)

Contacts

Shared address book App

DW Dana Whitfield dana@northwind.co 4 threads

OB Omar Baptiste omar@lumen.io 7 threads

MS Mia Sandoval mia@pinefield.dev 2 threads

Lists Everyone Investors Suppliers

How it works

## Running in three steps.

1. 01
   
   Save a contact
   
   From a message, from Contacts, or from your own code.
2. 02
   
   Group them
   
   Put contacts into named lists beside the built-in one holding everybody.
3. 03
   
   Open their mail
   
   A contact page lists every thread with that person.

What it runs on

## The parts doing the work.

Nothing here is a separate product. Each one is a piece of the mailbox you already have.

Recipient suggestions

The people you already write to, offered as you type. The address book syncs with Apple Contacts and other CardDAV apps.

SR

AK

NM

JD

PL

+1,240

sarahreyes@acme.com

REST API

A documented HTTP API with issuable, scopable, revocable keys.

/threads?query=invoice

{ "threads": 12 }

Same mailbox, whether a person or a program is holding it.

Typed SDKs

TypeScript, Python, Ruby, PHP, Go, Java and C# clients, one method for every operation.

/threads?query=invoice

{ "threads": 12 }

Same mailbox, whether a person or a program is holding it.

MCP server

Point Claude, or any MCP client, at your mailbox.

/threads?query=invoice

{ "threads": 12 }

Same mailbox, whether a person or a program is holding it.

Thread notes

Keep a private note attached to a thread.

18 messages → 1 summary

Three people agreed the launch slips to the 14th. Ali owns the changelog; Sarah needs copy by Friday.

Nearby

## Other jobs for the same inbox.

Send a newsletter

Design the email once, send it from your own code, and see what was opened.

Hi {{firstName}} Omar

Read the update

dana@northwind.co Clicked

omar@lumen.io Sent

130 Sent 42 Opened 9 Clicked

An inbox for agents

Point an assistant at a mailbox and let it read, draft and send.

agent@yourco.com Member

listThreads getThread searchMail sendEmail

Work a sales inbox

Send from a template, see who opened it, and book the call in the thread.

RK Rena Kaur 2

Intro call this week?

Sent

Opened

Clicked

Booked

[Every walkthrough](https://nextmail.sh/features/in-practice.md)