Warmerly
Pauses a mailbox whose health stays below 60 for 2 days, and resumes it after 3 days; no spare swapped in
Warmerly
QuickMail
One-to-one · Swapping out unhealthy inboxes
Swapping out unhealthy inboxes
One row, in depth: what each tool does, the verified numbers, and who each suits.
QuickMail details read from its pricing page, home page, product pages and help centre on 21 October 2026.
Warmerly
Pauses a mailbox whose health stays below 60 for 2 days, and resumes it after 3 days; no spare swapped in
QuickMail
Deliverability AI swaps in another inbox from the same group when a score falls below 60%; 14-day recovery
The short answer
Swapping out unhealthy inboxes, in one look.
Warmerly pauses a mailbox whose health stays below 60 for 2 days and resumes it after a 3-day cooldown, and we found no automatic swap-in of a spare mailbox. QuickMail's Deliverability AI swaps an inbox out of a campaign when its score drops below 60% or it loses permission, using up to 7 Smart Sending Groups, and the swapped inbox rests for 14 days. Last checked 22 October 2026.
QuickMailQuickMail ahead on this row
Deliverability AI swaps in another inbox from the same group when a score falls below 60%; 14-day recovery
The picture
Drawn side by side.
What happens to a poor inbox
Warmerly pauses it, then resumes it. QuickMail swaps another inbox from the same group into the campaign.
WarmerlyQuickMail
WarmerlyPause, then resume
- Below 60
- Below 60
- Paused
- Paused
- Paused
- Resumes
Health below 60 for 2 days pauses the mailbox. A 3-day cooldown follows.
No spare swapped in
QuickMailSwap, then recover
- Below 60%
- Swapped
The swapped inbox rests in 14-day recovery mode. Checked daily at midnight in your timezone.
Up to 7 Smart Sending GroupsNeeds open tracking
| Tool | What it shows |
|---|---|
| Warmerly | A mailbox whose health stays below 60 for 2 days is paused and resumes automatically after a 3-day cooldown. No spare mailbox is swapped in. |
| QuickMail | Deliverability AI swaps an inbox out when its score drops below 60%, using a replacement from the same Smart Sending Group, one of up to 7. The swapped inbox enters 14-day recovery mode. |
Each cell is one day or one step, not to scale.
How Warmerly does it
Warmerly, in detail.
A health score that pauses a failing mailbox and resumes it automatically after a cooldown.
01
Pause on poor health
A mailbox whose health stays below 60 for 2 days is paused automatically, and the event is recorded.
Warmerly product, checked 21 October 2026
02
Automatic resume
A health-paused mailbox is resumed automatically after a 3-day cooldown. A mailbox paused by its owner, or one that needs reconnecting, is not touched.
Warmerly product, checked 21 October 2026
03
What it does to sending
Warmup, pairing and campaign sending use only active or warming mailboxes, so a paused mailbox drops out of all three.
Warmerly product, checked 21 October 2026
04
Where Warmerly is behind
We found no code that swaps a spare mailbox into a campaign when one is paused, and no groups of interchangeable mailboxes.
Warmerly product, checked 21 October 2026
05
A bounce brake before any pause
Warmerly reads each mailbox's bounce rate over 7 days, once it has 25 sends. Below 2% nothing changes. From 2% the daily campaign cap is cut to 75%, then 50%, then 25%, never below 1 a day.
Warmerly product, checked 21 October 2026
06
Off campaigns at 7%, warmup carries on
At a 7% bounce rate the mailbox is taken off campaigns and the owner gets an email. The mailbox shows a Recovering badge, warmup keeps running, and it returns to campaigns by itself once its health score is back up.
Warmerly product, checked 21 October 2026
07
The score is built from warmup mail
The 0 to 100 health score is recalculated daily from 7 days of warmup mail. About half is the share that reached the inbox, a fifth is few bounces, 15% is replies and 15% is mail delivered and found. It is not a promise about your cold email.
Warmerly product, checked 21 October 2026
How QuickMail does it
QuickMail, in detail.
Daily checks that replace low-scoring inboxes with healthy ones from the same colour group.
01
Smart Sending Groups
You can assign accounts to up to 7 groups: red, orange, yellow, green, blue, purple and gray. Accounts swap only within their group.
help.quickmail.com/deliverability/deliverability-ai · read 21 October 2026
02
The threshold
By default an account is swapped out if its deliverability score falls below 60% or it has lost permission. It is replaced by a group member scoring 60% or more. If none qualifies, the original stays.
help.quickmail.com/deliverability/deliverability-ai · read 21 October 2026
03
Recovery
A swapped account enters 14-day recovery mode: no emails to new leads, though follow-ups may still go. Checks run daily at midnight in the account's timezone.
help.quickmail.com/deliverability/deliverability-ai · read 21 October 2026
04
What the score is made of
The score uses detected opens and the MailFlow confidence score over the past ten days. It does not appear if volume is too low or the inbox has sent for under 10 days, and open tracking must be on.
help.quickmail.com/deliverability/deliverability-ai · read 21 October 2026
05
Paused inboxes are not swapped
It says paused email accounts will not be swapped. Swapping needs open tracking on, and an inbox in a group that has no qualified replacement stays where it is.
help.quickmail.com/deliverability/deliverability-ai · read 22 October 2026
06
Recovery can be ended by hand
To use a swapped inbox again you re-assign it to the campaign and remove it from its Smart Sending Group, which takes it out of recovery mode. The recovery length can be changed.
help.quickmail.com/deliverability/deliverability-ai · read 22 October 2026
07
Settings live on each inbox
The score threshold and recovery period are set under Sending Settings on each inbox. Its API also sets the daily limit, recovery period and sending groups.
help.quickmail.com/integrations/setting-up-api-v2 · read 22 October 2026
08
Marked on screen
A swapped inbox shows a heart icon beside it while it is in recovery. Groups are assigned from the Email page, and a group colour appears in a column.
help.quickmail.com/deliverability/deliverability-ai · read 22 October 2026
What QuickMail does not say
We looked, and found no statement on these. That is about its published pages only, not about the product.
- How accurate the score is
- The exact formula behind the Deliverability Index
- Whether Deliverability AI is on every plan or only some
Where the sources disagree
We report each version rather than pick one.
- Its deliverability page says Deliverability AI analyses hundreds of data points daily, while its help page says the index is based on detected opens and the MailFlow confidence score over ten days. We describe the help page.
The numbers
Only what we could verify.
| Measure | Warmerly | QuickMail |
|---|---|---|
| Swapping out unhealthy inboxes | Pauses a mailbox whose health stays below 60 for 2 days, and resumes it after 3 days; no spare swapped in | Deliverability AI swaps in another inbox from the same group when a score falls below 60%; 14-day recovery |
| Action on a poor inbox | Pause the mailbox | Swap in another inbox from its group |
| Threshold | Health below 60 for 2 days | Score below 60% |
| How long it rests | 3-day cooldown, then resumes | 14-day recovery mode |
| How often it checks | Health is scored daily | Daily, at midnight in your timezone |
| Groups | None found | Up to 7 Smart Sending Groups |
| Needs open tracking | Not stated | Yes |
| Score window | 7 days of warmup mail | 10 days of opens and MailFlow score |
| Bounces | Cap cut from 2%, off campaigns at 7% | Not part of the stated score |
| Return to sending | Automatic once health recovers | After 14 days, or re-assign by hand |
| Paused inboxes | Left alone by the health auto-resume if paused by their owner | Not swapped |
In practice
What it means for you.
Our reading of the facts above. Not a promise, and not the only reasonable reading.
Pausing and swapping are different
Warmerly stops a failing mailbox. QuickMail keeps the campaign moving by swapping in another inbox from the same group, provided one scores 60% or more.
A score needs data
QuickMail shows no score for an inbox that has sent for under 10 days or sends little. Warmerly scores health from warmup activity too.
Check the opens dependency
QuickMail's score uses detected opens, and open tracking must be on. Check that open tracking suits your sending before you rely on the score.
Swapping does not fix a bad list
A swap moves sends to another inbox. If the cause is a bad list, the next inbox soon looks the same. Warmerly's checks work the other way round: they judge the campaign first, then the mailbox, so a bad list stops a campaign before it burns every sender.
Where QuickMail's swap helps
If you rotate many inboxes and one drifts, a swap keeps the campaign moving without you. Warmerly pauses or slows that mailbox and the others carry the campaign, but it does not bring a spare in.
Read the score for what it is
Both scores are inputs, not verdicts. QuickMail's rests on detected opens, which tracking can distort, and Warmerly's rests on warmup traffic inside its own network, so a placement test of a real message is the cross-check.
Who it suits
Pick the one that fits.
Warmerly
Warmerly is the better fit if
- You want a simple pause and automatic resume for unhealthy mailboxes
- You do not need spare mailboxes swapped in
- You want bounces to slow a mailbox before it is stopped
- You want the owner emailed with the numbers when a mailbox is taken off campaigns
QuickMail
QuickMail is the better fit if
- You rotate many inboxes and want a spare swapped in automatically
- You want colour groups of interchangeable inboxes
- You want spare inboxes grouped and swapped in on a schedule
- You want to tune the threshold and the recovery period per inbox
Questions
What is QuickMail's Deliverability AI?
It swaps an inbox out of a campaign when its score drops below 60% or it loses permission, using up to 7 Smart Sending Groups. The swapped inbox rests for 14 days.
Does Warmerly swap in a spare mailbox?
No, we found no automatic swap-in. It pauses the mailbox and resumes it after a 3-day cooldown.
What does QuickMail's Deliverability AI need to work?
Open tracking. Its score uses 10 days of opens and MailFlow score.
What happens in Warmerly when a mailbox's bounce rate rises?
The cap is cut from 2% and the mailbox comes off campaigns at 7%. Bounces are not part of QuickMail's stated score.
Sources
QuickMail pages were read on 21 October 2026. Plans and wording change, so check the vendor's own page before you decide. Warmerly details come from the product as it runs today.
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