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The Missive alternative built for outbound

Q: Is Master Inbox a help desk?

No. Help desks are built around support tickets; Master Inbox is built around outbound replies: campaign attribution, intent labels, speed-to-lead, and booking. Many teams run both.

Missive is a solid team inbox with chat built in. Outbound reply handling is a different job: hundreds of sending mailboxes, LinkedIn in the mix, and a team that grows with volume. That is what Master Inbox is built for.

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Free 7-day POC. Unlimited users on every plan.

The real Master Inbox: replies from every mailbox labeled by intent, with campaign attribution

If a small team shares a company inbox and wants chat around every email, Missive does that well and we are not going to pretend otherwise. The comparison below is about a different job: working the replies your cold outbound generates.

Master Inbox vs Missive, feature by feature

The short version: Missive is priced per seat and built around a shared team inbox. Master Inbox is priced on dedicated mailbox tiers with unlimited users, as low as $22 per client at scale, and built around outbound replies.

	Master Inbox	Missive
Built for	Outbound agencies and sales teams	Shared team inbox and support
Pricing model	Unlimited users. Priced on mailboxes and client workspaces	Per seat, per month
Hundreds of sending mailboxes	Designed for it. One operator can run 50+ inboxes	Not the design goal
LinkedIn replies	Same thread as email, per prospect	Email only
Sequencer integrations	SmartLead, Instantly, EmailBison, HeyReach, Lemlist and more	Not built for cold outbound tools
AI on replies	Intent labels on every reply: interested, OOO, referral, pricing ask. Drafts in your voice	AI compose and summaries for team email
Client workspaces	Isolated workspace per client, white-label client views	Team-oriented, not client-oriented
Reply routing	Replies leave through the sending domain the thread started on, headers intact	Standard send from connected inbox
CRM sync	HubSpot two-way sync, unmetered. Webhooks to any CRM	App integrations vary by plan

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Comparison last verified: August 2026. Competitor features and pricing change; tell us if a row is out of date.

Why outbound teams actually switch

These are the four walls teams hit, in the order they usually hit them. All four come from real migration calls.

Master Inbox reporting: SLA tracking, reply coverage and per-channel breakdowns

You can't see which campaign a reply came from

A shared inbox shows you the message. It cannot tell you which sequencer, campaign, or step produced it, so you can't tell which campaigns book meetings and which just make noise. Master Inbox links every reply to its campaign and pushes the data back, so reporting means something.

AI labeling in Master Inbox: every reply classified by intent on your own model and prompt

Forwarding is a house of cards

Shared inboxes ingest outbound replies by forwarding rules, and at volume that breaks: threads split, headers change, deliverability suffers, and some replies simply never arrive. Master Inbox connects the mailboxes directly, so every thread arrives whole.

Reply Agents in Master Inbox: drafts held for review, success rates and pending queues

Half your conversations are on LinkedIn

Outbound runs on email and LinkedIn together, across automation tools and SDR profiles. A team inbox has never heard of any of that. Master Inbox threads both channels per prospect, so the meeting request hiding in a LinkedIn second reply gets seen.

Two responders becomes eight

One team we spoke to ran two people in their shared inbox and needed to scale to eight plus. On per-seat pricing that is a 4x bill before anyone answers a reply. Master Inbox has unlimited users on every plan, so scaling the team costs nothing.

Reps stop alt-tabbing to ChatGPT

The pattern in a shared inbox: read the reply, switch to an AI chat to draft, switch to the calendar to find a slot, paste it all back. Master Inbox drafts in place with your own LLM key and proposes real calendar availability in the reply.

The hot reply waits its turn

In a first-in-first-out shared inbox, a pricing question queues behind forty out-of-office notices. AI labels sort replies by intent the second they land, so your team works interested and meeting-request first, every time.

Questions we get

When is Missive the better choice?

If a small team shares a company inbox and wants chat around every email, Missive does that well and we are not going to pretend otherwise.

We already use Missive for our shared inbox. Do we have to switch?

No. Some teams keep Missive for the company inbox and run Master Inbox for outbound replies. They solve different problems, and nothing forces you to pick one inbox for both jobs.

Is Master Inbox a help desk?

No, and that is the point. Help desks and shared inboxes are built around tickets from customers. Master Inbox is built around replies from prospects: campaign attribution, intent labels, speed-to-lead, and booking. Many teams keep a help desk for support and run Master Inbox for outbound.

What does per-seat pricing actually cost at scale?

Missive charges per user per month, so a reply team that grows from two to eight people roughly quadruples the bill without answering a single extra reply better. Master Inbox includes unlimited users on every plan and is priced on dedicated mailbox tiers, as low as $22 per client at scale, so the cost of adding people is zero.

Can it tell me which campaign a reply came from?

Yes. Replies are linked to the sequencer, campaign, and lead that produced them, and activity flows back into your sequencer and CRM. That attribution is the single most common reason outbound teams tell us a shared inbox stopped working for them.

We pipe replies in with forwarding rules today. Why change that?

Forwarding at outbound volume splits threads, rewrites headers, hurts deliverability, and silently drops messages. Master Inbox connects your mailboxes directly by OAuth or API key, so threads stay whole and nothing depends on a forwarding rule someone forgot about.

Does Master Inbox replace my sequencer?

No. Your sequencer keeps sending. Master Inbox is post-send: it captures, tags, and routes every reply your campaigns generate, across email and LinkedIn.

How fast is setup?

Onboarding is white-glove and most teams are live the same week. Sequencers connect by API key, mailboxes by OAuth, and one-click imports cover the common inbox providers.

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