Instantly
Instantly sends the campaigns but misses forwards and new-address replies. Master Inbox catches every Instantly reply, tags it, and syncs it to your CRM.
How Instantly works with Master Inbox
Instantly runs high-volume cold email with built-in deliverability, but its Unibox shows campaign replies only, with almost no filtering, so reps scroll to find the three that matter and miss the forwards, out-of-office, and new-address replies entirely. Master Inbox connects to the mailboxes behind Instantly and threads every reply, tracked and untracked, tagged by intent, so the hot ones surface first and nothing your Instantly spend produced slips. Master Inbox also has incoming webhook ingestion: form fills from landing pages, ad forms, and lead-gen forms, plus visitor-identification events, land straight inside the matching prospect thread and are readable by your reply agents.
What you can do
- See every Instantly reply in one inbox, not campaign by campaign or account by account
- AI-tag each reply as it lands: interested, objection, OOO, referral, asked-for-pricing
- Catch the forwards and out-of-office replies Instantly drops into an untracked folder
- Mark interested leads do-not-contact in Instantly so you stop emailing buyers
Why it matters for outbound revenue teams
Instantly is built to send, and it's good at it. But the replies, where deals are actually won, get scattered and missed. Master Inbox is the reply layer that turns your Instantly spend into worked, tracked, closed conversations.
“If your lead’s not in a campaign but they reply, it goes into the other box.”
Instantly + Master Inbox FAQs
How do I connect Instantly to Master Inbox?
Import the sending mailboxes your Instantly campaigns use, then open Settings, choose Integrations and connect Instantly with your API key. Campaign context then travels with each reply. Onboarding is done with you on your real inboxes during the free 7-day POC.
Does Master Inbox change how Instantly sends?
Instantly keeps running your campaigns, inbox rotation and warmup exactly as you set them up. Master Inbox works on the reply side, so keep Instantly for sending and use Master Inbox to read, label and answer what comes back.
Which Instantly replies show up in Master Inbox?
Every reply that reaches your sending mailboxes. Master Inbox reads the mailboxes themselves, so campaign replies, forwards, CC replies and new-address replies land together in one queue across your Instantly workspaces, threaded per prospect.
How are Instantly replies labeled in Master Inbox?
Each reply is labeled by intent as it lands, using thirteen default labels or your own taxonomy, on your own OpenAI, Anthropic or OpenRouter key. Saved views such as Needs Reply then put the interested conversations in front of your reps first.
Can agencies keep each Instantly client separate?
Yes. Master Inbox gives every client a workspace with its own mailboxes, labels, members and limits, cloned in one click. Client logins see only their own inbox, and your team works every client's replies from one place.
Is Master Inbox priced per seat?
No. Master Inbox is priced on connected mailboxes and client workspaces, with unlimited users on every plan, so adding a rep or a client login never adds a seat fee. Every plan starts with a free 7-day POC, and the pricing page lists the plans.
How do I fetch Instantly Unibox replies through an API?
Instantly's API v2 exposes Unibox emails and replies; see Instantly's developer docs for the endpoints. Master Inbox exposes those replies too, and adds the forwards, CC replies and new-address replies it reads from the mailboxes themselves, through the Master Inbox API with labels and full thread context. See the API page.
Does Master Inbox replace the Instantly Unibox?
For the team working replies, yes: one queue across every Instantly workspace and mailbox, AI labels, views, workflows and Slack. Instantly keeps sending; nothing about your campaigns changes.
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Master Inbox is the reply router in the middle of your stack.
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