Smartlead + Master Inbox: keep sending, catch every reply

If you're running cold email at scale, Smartlead is the engine. Inbox rotation, warm-up,
AI categorization, and deliverability that holds up under volume.

Master Inbox takes everything that happens after the reply and turns it into a revenue system.
Advanced threading, deal stages, bi-directional label sync, multi-team workspaces, and automatic CRM updates layer on top of what Smartlead already has.

Smartlead generates replies from prospects.

Master Inbox makes sure every single reply gets acted on.

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Reply Control Center

One inbox for every team, organized, filtered and prioritized.

Warm-Up Noise Blocker

Automatically exclude Smartlead warm-up conversations so only real prospects reach your team.

Bi-Directional Label Sync

Labels stay synced between Smartlead and Master Inbox.

What workflows do teams run with Smartlead and Master Inbox?

Reply prioritization, meeting booked stops the campaign, interested goes to Slack and the CRM, and not interested unsubscribes everywhere.

Popular workflow

Two-Way Label Sync Across Smartlead & Master Inbox

Apply a label once in Master Inbox or Smartlead and keep both in sync.

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Popular workflow

Reply → Stop Outreach

A prospect replies, follow-ups stop, there is no over-contact, and your brand stays clean.

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Assign Replies by Channel and Intent

Route and assign replies automatically based on email intent, campaign type, lead status, team, or workspace.

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Smartlead Warm-Up Exclusion

Automatically syncs Smartlead warm-up labels and excludes warm-up conversations.

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High-Intent Reply Prioritization

Master Inbox automatically surfaces: “Interested,” “Book a call,” “Send details.”

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Reply → Slack Alerts for Top Leads

Notifies your team instantly when a high-intent reply hits.

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Reply → CRM Sync

When a reply from a prospect comes in, Master Inbox automatically labels the new lead and updates the CRM. No manual sorting.

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What customers say

Sales teams and the partners who run their outbound, on what changed once every reply landed in one inbox.

Our cold email process used to be messy. Responses were forwarded around and often hard to track. With Master Inbox, we have completely streamlined it. The Slack integration has also been a huge win, giving us instant lead notifications and improving our reporting.

Alex, Freedom For Founders.com

If you want results from reps you have to make it easier for them. Having a partner that builds the integration we need and puts everything in one place is exactly that.

Jennifer A., Revenue Operations, Global-e

FAQs

Have a question? We’re here to help.

Yes. Master Inbox gives unlimited custom views on every plan.

Absolutely. Master Inbox supports multi-team and multi-workspace setups, making it ideal for sales teams running Smartlead campaigns at scale.

Smartlead integrates with Master Inbox via secure API sync, allowing replies, labels, prospects, and campaign data to flow into a single unified inbox with full control over exclusions and automation.

Yes. Master Inbox threads by prospect, so every campaign conversation sits in one view.

Yes. You can enable bidirectional label sync so labels applied on either platform stay aligned.

Yes. On the Revenue plan, Master Inbox pushes replies to your CRM, such as HubSpot or Pipedrive, in real time.

Yes. High-intent replies are automatically prioritized and can trigger Slack alerts or assignments.

Teams using Master Inbox avoid lost leads, respond faster, and close more deals.

Yes. Master Inbox creates master threads, showing the full prospect journey across campaigns and subject lines in one view.

Master Inbox adds advanced filtering, master threads, automation, collaboration, and cross-workspace visibility, next to the replies from every other sequencer and LinkedIn tool you use.

Master Inbox syncs replies directly from mailboxes and brings in all conversations, not just campaign ones. That includes forwarded replies, CC replies and replies from a new address, which a sequencer’s own inbox does not show.

Still have questions?

Can’t find the answer you’re looking for? Ask us on a short call.

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