Know where your email lands before your prospects do.
Every mailbox sends within its own limits, is judged on its own reputation, and can be tested against real inboxes at Gmail, Outlook and Yahoo. When one starts to slip, Warmbly slows it down before the damage spreads.
A placement test sends your real email from a real mailbox to seed inboxes at Gmail, Google Workspace, Outlook.com, Microsoft 365, Yahoo and iCloud, then reads where every copy landed.
One mailbox at a time. Every mailbox is its own sender, with its own limits.
Each mailbox sends at most 50 cold emails a day by default and, with a variable sending plan, keeps its own workday: a start and finish that move by a few minutes each day, a lunch break, and an irregular gap between sends. Spreading volume across many healthy mailboxes is what keeps cold email out of spam.
- New mailbox
- 10 to 20 a day
- The first weeks are for reputation, not pipeline.
- Proven
- 30 to 50 a day
- The normal range for a healthy cold mailbox.
- Above 50
- with a reason
- Only on clean complaint and bounce numbers. The dashboard warns past 100.
Sending domains. Every domain checked, with the fix spelled out.
Warmbly checks SPF and DMARC on every domain you send from and shows the exact record to publish when one is missing, host and value ready to copy. It also shows whether each domain tracks clicks on its own verified subdomain instead of a host shared with other senders.
DKIM is never called missing, because DNS cannot list a provider's keys. When a domain is flagged, Warmbly says where the key goes and which console screen generates it.
The Advisor. It tells you what is wrong, and offers to fix it.
Fixed rules with fixed thresholds watch complaints, bounces, placement, authentication, caps and copy, and stay quiet until there is enough data to be right. Each finding says why it matters and what to do. Where the fix is a setting, you see the exact change before anything is applied, and most changes can be undone.
Suppression. Once someone opts out, every campaign knows.
Suppression covers the whole workspace. A bounce, a complaint, an unsubscribe or a reply asking to stop takes an address out of every campaign at once, including campaigns you create later.
Add customers, partners or a whole domain by hand to keep them out of outreach. Lifting an entry the recipient made themselves asks you to confirm and is written to the audit log.
When a mailbox slips. Slowed at 10%, halved at 20%, removed only for misconduct.
Spam placement slows a mailbox down until it recovers. Complaints and bounces are what take it out of the warmup pool, for 7 or 30 days.
| State | Spam placement | Complaints | Bounces | What happens |
|---|---|---|---|---|
| Watch | 10% | 0.03% | – | Lower warmup volume, wider spacing |
| Throttled | 20% | – | – | Half volume for warmup and cold sending |
| Quarantined | – | 0.10% | 5% | Out of the pool for 7 days, cold sending paused |
| Blocked | – | 0.30% | 10% | Out of the pool for 30 days |
- WatchSpam 10% · Complaints 0.03%
Lower warmup volume, wider spacing
- ThrottledSpam 20%
Half volume for warmup and cold sending
- QuarantinedComplaints 0.10% · Bounces 5%
Out of the pool for 7 days, cold sending paused
- BlockedComplaints 0.30% · Bounces 10%
Out of the pool for 30 days
Placement is judged only at Gmail, Outlook and Yahoo, once a mailbox has 20 verified warmup deliveries in a week.
How warmup health works
Questions. Deliverability, answered.
Is deliverability tracked per mailbox or per account?
Per mailbox. Each one has its own cap, gap and health, so one account can hold mailboxes in very different states at once, and a struggling mailbox never drags the others down.
Why is the default cap 50 a day?
It is the top of the range most cold mailboxes can hold without drawing provider attention. You can raise it for a mailbox with clean numbers, up to 5,000, and the dashboard warns you past 100. More volume should come from more healthy mailboxes, not from pushing one harder.
What happens when a mailbox starts landing in spam?
At 10% spam placement it is put on watch and warmup slows; at 20% warmup and cold sending both drop to half. It lifts on its own once placement recovers. Complaints and bounces are what take a mailbox out of the warmup pool.
How does suppression work across campaigns?
Suppression covers the whole workspace. Once an address bounces, complains, unsubscribes or asks to be removed, every campaign skips it from then on.
Which records does Warmbly check?
SPF and DMARC on each sending domain, with the exact record to publish when one is missing, and whether a mailbox tracks clicks on its own verified domain rather than a shared one.
Do you guarantee the inbox?
No, and be wary of anyone who does. Placement also depends on your content, your list and your domain’s history. What Warmbly controls is how each mailbox sends, how its reputation is watched, and how fast it is slowed down when something slips.
Read more about deliverability
All postsTest your next email before it goes out.
Connect a mailbox, run a placement test, and see where it lands at Gmail, Outlook and Yahoo.