Partner spotlight: Master Inbox
Master Inbox is a unified inbox that combines social and email conversations for sales teams. See how it connects to OutboundSync in beta.
Jason Ma
Masterinbox → Close
Masterinbox + Close integration
Your team qualifies replies in Master Inbox and closes them in Close. OutboundSync logs each message, label, and list change on the matching Close Lead.
BetaOne-way syncEmail and social
Masterinbox + Close at a glance
Master Inbox works with Close through OutboundSync. Outgoing and incoming messages from the email and social inboxes connected to Master Inbox, plus label changes and prospect list changes, are logged as activity on the matching Close Lead. Tools such as Expandi, Salesflow, PlusVibe, and Ashby reach Close through Master Inbox as well.
| Status | Beta (Close is a one-way beta CRM) |
|---|---|
| Channels | Email and social |
| Direction | One-way, Masterinbox → Close |
| Close records | Leads |
| Block lists | Not available for this pairing |
| Masterinbox plan | Needs webhook access |
| Setup | Guided: the OutboundSync team runs onboarding |
Master Inbox is often the tool that makes a Close setup possible for teams with many senders: one inbox to triage, one CRM to close in. OutboundSync links them, so a conversation qualified in Master Inbox shows up on the Close Lead with its full message history.
It also widens what Close can see. Several tools that don't connect to Close directly route through Master Inbox, and their conversations arrive through the same connection, with one onboarding run by the OutboundSync team.
What syncs from Masterinbox to Close
Every event below arrives in near-real time and lands on the matched Close record. Pick the ones you want per source.
| Event | Channel | Where it lands in Close |
|---|---|---|
| Message sent— Outgoing messages from connected accounts, logged as email sends | Activity on the Close Lead | |
| Email received— Incoming messages on connected email accounts | Activity on the Close Lead | |
| Social message received— Incoming messages on connected social accounts | Social | Activity on the Close Lead |
| Label changed | Activity on the Close Lead | |
| Prospect list changed | Activity on the Close Lead |
Event names come from the Masterinbox webhooks OutboundSync receives. Close is a one-way beta, so exact event coverage is confirmed during onboarding. See the Masterinbox event reference.
What teams do with Masterinbox + Close
Close qualified replies
Build a Smart View on Master Inbox labels so closers see qualified conversations first.
Reach more tools
Bring Expandi, Salesflow, or PlusVibe activity into Close through Master Inbox.
Keep list context
Prospect list changes on the Lead show where follow-up stands.
Ways to connect Masterinbox and Close
The options teams weigh before they commit a production sync.
| Option | What it does | Trade-off |
|---|---|---|
| Zapier, Make, or n8nCompare integration platforms | Catch Masterinbox webhooks and write each event to Close with a workflow you build. | Every event type, retry, and field change is a workflow you maintain, billed per task or step. |
| Custom buildBuild vs buy | Write your own service against the Masterinbox and Close APIs. | You own matching, deduplication, API limits, and every upstream schema change. |
| OutboundSync | Pre-built email and social activity sync into Close Leads. | One-way beta with guided onboarding. Lighter configuration than HubSpot or Salesforce today. |
How to set up Masterinbox + Close
Step 1: Connect Close
Authorize OutboundSync from the Close App Marketplace. The OutboundSync team adds Close as a Connected Account with you.
Step 2: Connect Masterinbox
The OutboundSync team creates your Masterinbox source with you and points Masterinbox's webhooks at it.
Step 3: Create the Close source
Select Masterinbox when you create the Close source, and confirm how contacts are matched.
Step 4: Send a test event
Trigger one Masterinbox event and confirm it on a real Close Lead.
Step 5: Go live
Launch with the OutboundSync team watching the first production events in Close.
Plan requirements
Masterinbox plan
Needs webhook access
OutboundSync receives Masterinbox activity through webhooks. Confirm your Masterinbox plan includes webhook access, or ask us to check during setup.
Close
Close is a one-way beta. There is no Close plan gate on our side; onboarding runs with the OutboundSync team.
Related integrations and guides
Masterinbox with other CRMs
Other outbound tools for Close
Trusted by outbound teams
Redis
Windsurf
Gainsight
Sendoso
Crescendo
TapcheckMasterinbox + Close FAQ
What Masterinbox activity does OutboundSync sync to Close?
Message sent, email received, social message received, label changed, and prospect list changed.Which Close records does it write to?
OutboundSync matches or creates Close Leads. Masterinbox events land as activity on the Close Lead. See the Close beta guide for details.Which tools reach Close through Master Inbox?
Expandi, Salesflow, PlusVibe, and Ashby flow into Close through Master Inbox, in addition to the inboxes you connect to Master Inbox directly.Is the integration one-way or two-way?
One-way. Activity flows from Masterinbox into Close, and nothing is written back to Masterinbox.Can I use Close records as a block list?
Not today. Block lists come from HubSpot lists or Salesforce reports. The Close beta syncs activity in only.Do I need admin access to set it up?
A Close admin authorizes OutboundSync from the Close App Marketplace during guided onboarding.Which Masterinbox plan do I need?
OutboundSync receives Masterinbox activity through webhooks. Confirm your Masterinbox plan includes webhook access, or ask us to check during setup.How is Masterinbox + Close priced?
Beta access is scoped with the OutboundSync team during onboarding. Billing follows the same model as every plan: sent messages per month. Replies, opens, clicks, and lead-category updates are not billed. See the pricing page.Can I do this with Zapier, Make, or n8n?
Yes, for lightweight automation. Zapier, Make, and n8n are good for prototypes and simple routing, but they need ongoing maintenance and bill by task or step. OutboundSync is pre-built for outbound CRM sync, keeps searchable event logs beyond 30 days, and prices by outbound volume.What breaks first when this scales?
Data quality and reliability break first: duplicate events, retries, out-of-order webhooks, and bursts during big sends. OutboundSync handles idempotency, timing buffers, and queue recovery, and flags suspicious or mismapped payloads instead of writing them.
Masterinbox resources
Tutorials, case studies, and updates related to Masterinbox.
See Masterinbox activity in Close
A quick walkthrough with your own stack. Setup takes minutes, with no long-term contract.
