Winnr can push your mailboxes straight into an EmailBison workspace, with tags, a 15-a-day limit and duplicates skipped, or hand you a CSV in EmailBison's bulk-import layout. Either way, Winnr provides the domains and mailboxes and EmailBison runs the campaigns.
EmailBison sells one plan: as of October 2026, $599 a month including 500,000 emails, with unlimited workspaces and unlimited teammates. At Winnr's recommended 15 cold emails per mailbox per day, 500,000 emails a month is the output of roughly 1,100 mailboxes. EmailBison is priced for teams that run hundreds of mailboxes, often in a separate workspace per client, and those mailboxes have to come from somewhere.
Winnr supplies them as standard SMTP and IMAP accounts on your own domains. Buy domains in Winnr (a .com is about $13, one-time) or connect your own, and Winnr publishes SPF, DKIM and DMARC and creates the mailboxes. EmailBison connects with the address and password over SMTP on port 465 and IMAP on port 993, so there is no OAuth flow and no app password.
When you want to review or edit the file first.
The quicker route for most teams.
Full guide: Connect Winnr mailboxes to EmailBison.
One password column, no username column: the address is the login for both protocols.
| Column | What Winnr puts in it |
|---|---|
Name | The mailbox's display name |
Email | The full email address, which is also the login |
Password | The mailbox password, used for both SMTP and IMAP |
IMAP Server | That mailbox's mail server |
IMAP Port | 993 |
SMTP Server | That mailbox's mail server |
SMTP Port | 465 |
Daily Limit | 15, or the mailbox's Winnr daily send limit if lower |
SMTP Secure | true |
IMAP Secure | true |
The sync sends the same 10 fields, so this is also what the sync creates. EmailBison's layout has a single Password column and no username column: the Email doubles as the login. Leave both Secure flags as true, because ports 465 and 993 only work over SSL. Mailboxes on different domains can use different servers, so keep each row's own values. The download link lasts 15 minutes and the file holds passwords in plain text.
Because EmailBison includes unlimited workspaces, agencies often give each client its own. Winnr's side of that is domain tags. Tag each client's domains (client-acme, client-beta), then run Sync Emails once per client: pick that client's workspace and scope the sync to that client's tag. Only those mailboxes go into that workspace, and running it again later only adds what is new.
The same EmailBison tab has a Sync Tags tool. It finds your Winnr mailboxes in EmailBison and attaches your Winnr domain tags to them, so you can filter senders by tag inside EmailBison. The tags must already exist in your EmailBison workspace before you run it. More on running many clients from one Winnr account: cold email inboxes for agencies.
EmailBison's per-sender daily limit is its campaign limit, so both the sync and the CSV give it the cold value: 15 per mailbox per day, and you can keep it anywhere between 10 and 20. Warming counts on top of that, so keep each mailbox's total at 50 or under.
Pick one warmer per mailbox. If Winnr warms it ($0.60 per mailbox per month, with a 0 to 100 health score in Winnr), leave the sync's warmup switch off, and after a CSV import check that EmailBison's warmup is off for those senders. If EmailBison warms instead, switch it on and turn Winnr's warming off for those mailboxes. Warm new mailboxes for at least two weeks before cold sending, or start with pre-warmed domains that are ready the same day.
A flat sequencer price makes each extra mailbox cheap to add.
| Mailboxes | Cold emails a month at 15 a day | EmailBison | Winnr | Total | Per 1,000 cold emails |
|---|---|---|---|---|---|
| 200 | 90,000 | $599 | $189 (Enterprise) | $788 | About $8.76 |
| 500 | 225,000 | $599 | $489 (Enterprise + 300) | $1,088 | About $4.84 |
| 1,000 | 450,000 | $599 | $989 (Enterprise + 800) | $1,588 | About $3.53 |
EmailBison price from emailbison.com/pricing, checked October 6, 2026: one Base Plan at $599 a month including 500,000 emails, with unlimited workspaces and teammates; extra monthly email buckets are available but not priced on that page. Monthly figures assume 30 days of sending. Because EmailBison's price is flat up to 500,000 emails, the cost per email falls as you add mailboxes, and Winnr's extra mailboxes are $1 each. Winnr warming adds $0.60 per mailbox; domains are a one-time purchase.
200 mailboxes for $189/month on Enterprise, and extra mailboxes are $1 each. Billed monthly, cancel anytime.
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