Your team's outbound conversations don't live in HubSpot. They're scattered across sequencer inboxes, LinkedIn, and whichever mailbox a reply happened to land in. So the contact record the thing your forecasting, reporting, and handoffs all depend on is always a little bit wrong.

The usual fixes make it worse. CCing the CRM gives you half a thread. Forwarding loses the formatting and attributes the message to the wrong person. Copy-paste doesn't scale past a few replies a day. And none of it touches LinkedIn at all, which is where a growing share of outbound replies now come from.

MasterInbox closes that gap in both directions.

💬 Reply from the contact record

A MasterInbox card on every contact shows the full email and LinkedIn history as one properly formatted thread. Reps read and reply right there — no CCing, no forwarding, no second tab. Replies send from the original mailbox and thread onto the existing conversation, so your prospect just sees a normal reply.

🔄 Keep HubSpot current automatically

Contacts are created or matched by email address or LinkedIn, so you don't get duplicates. Emails log to the timeline as sent and received. LinkedIn messages log as native LinkedIn activities, not generic notes. Meetings, reschedules and cancellations flow through too.

🛑 Stop sequences talking over live conversations

When a rep replies from HubSpot, that person is removed from any active sequence — so automated follow-ups never chase someone who is already in a conversation with you.

MasterInbox works with the tools outbound teams actually run on: Google, Outlook, Zoho, custom IMAP/SMTP, Instantly, Smartlead and Reply.io for email; LinkedIn, HeyReach, LeadBird, Aimfox, Expandi, SalesFlow, SalesRobot, Lemlist and GetSales for LinkedIn.

Field mapping stays under your control: any MasterInbox field to any HubSpot property, in both directions, with a match-only mode if you would rather link to existing contacts without writing to them.

Setup is one connection from MasterInbox → Settings → Integrations → HubSpot. Approve the permissions and the sync and the contact card switch on together. No keys to copy between systems, no CSVs, no guessing at field mappings.

Built for sales teams and lead-gen agencies who prospect at volume and need HubSpot to stay the source of truth while they do it.