The top of the Warming page shows four cards: Active Mailboxes, Avg Health Score (with a Good / Fair / Needs attention label), Avg Inbox Rate, and Today's Progress (warmup emails sent vs scheduled today). Health score runs 0 to 100 and is calculated from the spam rate (health = 100 minus 2 × spam rate), so 80+ is Good, 50 to 79 is Fair and below 50 needs attention. Inbox rate is the share of warmup emails that did not land in spam. Metrics refresh automatically every few hours, whenever you open the Warming page, and when you click Refresh.
Filters
The row at the top of the Warming page lets you narrow everything below it:
- Date range: Last 7, 14 or 30 days (affects the charts).
- Tags and Domains: show only mailboxes on the chosen domains, or on domains carrying the chosen tags.
Click Refresh at the top right to pull the latest numbers. They also refresh automatically every few hours and each time you open the page.
The summary cards
- Active Mailboxes: mailboxes currently warming, out of all warming mailboxes (for example 18/20), with a count of any that are paused.
- Avg Health Score: the average health score across mailboxes that have data, labeled Good (80+), Fair (50 to 79) or Needs attention (below 50).
- Avg Inbox Rate: the share of warmup emails that stayed out of spam, shown with the calculation: (sent minus spam) / sent.
- Today's Progress: warmup emails sent today vs scheduled today, with how many remain. If nothing is scheduled on a Saturday or Sunday, the card says "Warming pauses on weekends".
If any mailbox can't be reached, a red badge shows how many have connection problems.
Health score
A 0 to 100 score for each mailbox, calculated from its recent spam rate: health = 100 minus 2 × spam rate. A mailbox with no warmup mail landing in spam scores 100; one with 10% landing in spam scores 80.
- 80 to 100 (green, Good): healthy. Ready for real sending once the warming period is over.
- 50 to 79 (yellow, Fair): still building, or slipping. Keep warming and watch the trend.
- Below 50 (red, Needs attention): something is wrong. Check DNS, blocklists and recent volume changes.
A mailbox with no data yet shows "--".
Inbox rate and spam
Inbox rate is the share of recent warmup emails that did not land in spam: inbox rate = 100 minus spam rate. The Spam column shows how many warmup emails landed in spam, with the spam rate in brackets.
- Inbox rate 90% or higher: good.
- 70% to 90%: fair. Normal early on; concerning if it stays here after a couple of weeks.
- Below 70%: poor. Check DNS health, blocklists and your ramp speed.
Charts
- Inbox Rate Trend: inbox rate day by day across the selected date range. Sharp drops are often the first sign of a DNS or blocklist problem.
- Daily Volume: warmup mail per day split into Inbox, Spam and Replies. Volume should rise over the first weeks as the ramp works.
Inbox Score Distribution
Groups your domains and your mailboxes by inbox rate into Good (90% and up), Fair (70 to 90%) and Poor (below 70%). Click a bucket to filter the Domains and Mailboxes tables to just that group, which is the quickest way to find the weak spots in a large setup.
Domains table
One row per domain: Domain, Mailboxes, Volume/Day, Sent Today, Total Sent, Avg Health, Avg Inbox Rate, Spam and Status. Tick domains to set volume or ramp-up, pause, resume or disable warming for every mailbox on them at once.
Mailboxes table
One row per mailbox:
- Email, with a Google, Microsoft or External badge for imported mailboxes.
- Today: warmup emails sent today out of today's scheduled amount.
- Total Sent: warmup emails sent over a rolling recent window, so it can go down as well as up.
- Health: the mailbox's health score.
- Inbox Rate and Spam: as described above.
- Ramp-up: Slow, Normal, Fast, or Off.
- Status: Active, Paused, Connecting (being set up) or Problem (can't connect).
- Created: the date warming started.
The "..." menu on each row has Pause or Resume, Edit Settings, View Metrics, and Disable Warming (plus Delete Account for imported mailboxes). A mailbox showing Problem also gets Reconnect, which sends the mailbox's current password to warming and restarts it without losing its history. View Metrics opens that mailbox's health score, inbox rate, spam rate, total sent, replies and daily volume setting, with its own inbox-rate chart.
Mailboxes where warming is disabled don't appear on the Warming page.
What's next
Frequently asked questions
My health score is 65. Is that bad?
It's in the Fair range. That's common in the first week or two, when there's little data and a single spam placement moves the number a lot. Watch the trend. Rising means warming is working; flat or falling for several days is worth investigating.
Inbox rate is 60%. What's wrong?
That's low for a mailbox that's been warming for more than a week or two. Common causes are a DNS problem on the domain, a new blocklist listing, or a ramp that's too fast. Check the domain's DNS health first, then try a slower ramp-up speed.
Spam jumped overnight. What now?
Usually a DNS or blocklist issue. Check the domain's DNS health first. If that's fine, check blocklists. If both are clean, contact support@winnr.app.
What health score do I want before starting cold campaigns?
Aim for Good (80 or higher) and a steady or rising trend, after at least 2 weeks of warming (4 on a brand-new domain). Higher is better; a mailbox that's still Fair will underperform on real campaigns.
Why does it say "Syncing..."?
The mailbox hasn't reported any warmup activity yet. This is normal right after you enable warming. Numbers appear after the next sync.
Why is a mailbox's status Problem?
Winnr can't sign in to the mailbox to send or receive warmup mail. For a Winnr mailbox this usually follows a password change; for an external mailbox it's usually a revoked or wrong app password. A red badge above the tables counts mailboxes with connection problems. To fix it, open the "..." menu on the mailbox's row and click Reconnect, which sends the current password to warming and restarts it with its history kept. If Reconnect says it can't sign in, check the mailbox's password first. Contact support@winnr.app if a Winnr mailbox still shows Problem after a successful Reconnect.
Do the metrics predict real cold-email deliverability?
They're the best early indicator you have. A mailbox whose warmup mail stays out of spam usually has a good reputation with the major providers. It's not a perfect predictor, because real campaigns have their own content, list quality and volume.