In Winnr go to Email Users → Export, choose MasterInbox, click Export, then Download CSV. In MasterInbox, open your email-account settings and use the bulk import to add the file's mailboxes. Once connected, replies from all your Winnr mailboxes flow into MasterInbox.
MasterInbox is a unified inbox for cold-email teams: it brings replies from many sending accounts into one place. Winnr provisions and warms the mailboxes; MasterInbox manages the replies.
Sending limits
Keep cold sending at 10 to 20 emails per mailbox per day (15 is a good default), and keep each mailbox's total, cold plus warming, at 50 or under. Warm new mailboxes for at least two weeks before they send cold, and longer on a brand-new domain.
What's next
Step-by-step
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1. Select the mailboxes in Winnr
Open Email Users and tick the mailboxes you want to centralize. Search or the Domain filter help you find them. If nothing is ticked, the export includes every mailbox in your account.
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2. Export in the MasterInbox format
Click Export, choose MasterInbox under Export Format (type in the search box to find it quickly), then click the Export button.
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3. Download the CSV
Click Download CSV as soon as it appears. The link expires after 15 minutes, so if it has expired just run the export again. The file holds mailbox passwords in plain text, so keep it private.
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4. Import into MasterInbox
In MasterInbox, open your connected email-account settings and use the bulk import option with the Winnr file.
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5. Confirm every mailbox connected
Check every mailbox shows as connected so no replies are missed.
Frequently asked questions
What is in the MasterInbox file?
Email Address, Full Name, IMAP USERNAME, IMAP Password, IMAP Host, IMAP Port, SMTP USERNAME, SMTP Password, SMTP Host and SMTP Port.
What is MasterInbox for?
It is a unified inbox for reply management. Many teams send with a sequencer such as Smartlead or Instantly and use MasterInbox as the reply layer over the same Winnr mailboxes.
Does MasterInbox need IMAP?
Yes. It reads mail over IMAP to collect replies, so the IMAP fields in the Winnr export are required.
Where does warming fit in?
Warming runs on the mailbox, not in MasterInbox. Use Winnr's built-in warming ($0.60 per mailbox per month) and MasterInbox simply reads the inbox.
What connection settings are in the file?
Each row carries that mailbox's own SMTP host (port 465, SSL) and IMAP host (port 993, SSL). The username is the full email address, and the same password works for SMTP and IMAP. Mailboxes on different domains can use different hosts, so keep the values from each row rather than copying one host across every mailbox.
Some mailboxes failed to connect. What now?
The usual cause is an old password: a password changed in Winnr after the export will not match the file. Export those mailboxes again and re-import them. If a fresh export still fails, see the mailbox authentication troubleshooting guide.