TL;DR
Open Master Inbox (next.listkit.io/master-inbox) from the left sidebar.
Switch folders with the dropdown at the top left: All Inboxes, Unread Replies, Sent and Archive.
Open Filter Options to filter By Campaign and By Category, then click Apply.
For positive replies, choose Specific Lead Category and select Interested and Meeting booked.
The Bounced category only shows bounces that were categorized, not every bounce.
When you'd use this
Use filters to focus on the replies that matter, like interested leads in one campaign, or to review out-of-office and unsubscribe replies.
Step-by-step
Open Master Inbox (next.listkit.io/master-inbox).
Choose a folder from the dropdown at the top left: All Inboxes (every reply), Unread Replies, Sent (emails you sent) or Archive.
Click the filter button at the top of the list, next to the refresh button, to open Filter Options.
Under By Campaign, keep All campaigns or pick one campaign.
Under By Category, switch from Ignore Lead Category (shows everything) to Specific Lead Category, then select one or more categories.
Click Apply. Close shuts the panel without applying, and Clear all resets your filters.
The categories you can filter by:
Interested: leads who replied positively. AI sometimes marks automatic replies as Interested, so skim before you act.
Meeting booked: leads who booked a call.
Not Interested: leads who declined.
Out Of Office: automatic out-of-office replies.
Unsubscribed: leads who opted out.
Bounced: emails that didn't deliver and were categorized. See How can I see which leads bounced or unsubscribed, and how do I block a contact? for the full picture.
Uncategorized: replies the AI couldn't label. Check these yourself.
Nurture
Expected outcome
Master Inbox shows only the conversations you want, so you can answer interested leads first.
FAQ
What is the difference between Ignore Lead Category and Specific Lead Category?
Ignore Lead Category shows every reply. Specific Lead Category shows only the categories you select.
Can I filter by more than one category at once?
Yes. Select as many categories as you want.
Can I filter Master Inbox by campaign?
Yes. Use By Campaign in Filter Options.
Why don't all my bounces show under Bounced?
A bounce isn't a reply, so only categorized bounces appear there. See How can I see which leads bounced or unsubscribed, and how do I block a contact?.
Do I have to keep checking Master Inbox?
No. Turn on positive-reply notifications. See How do I get notified when a lead replies?.