Warmerly
On every mailbox: threaded conversations with quoted replies and spam rescue, on a ramp from 4 a day to 50.
Warmerly
Skylead
One-to-one · Mailbox warmup
Mailbox warmup
One row, in depth: what each tool does, the verified numbers, and who each suits.
Skylead details read from its pricing page, terms, privacy policy and feature pages on 21 October 2026.
Warmerly
On every mailbox: threaded conversations with quoted replies and spam rescue, on a ramp from 4 a day to 50.
Skylead
Infinite email warm-up through a partner, under a fair-use limit of 100 email slots per team.
The short answer
Mailbox warmup, in one look.
Both warm mailboxes. Skylead lists infinite email warm-up through a partner, with a fair-use limit of 100 email slots per team. Warmerly warms every mailbox on a published ramp, from 4 a day at day 0 to 50 a day by day 30, and its limit is the mailboxes your plan covers. Last checked 21 October 2026.
Skylead
Infinite email warm-up through a partner, under a fair-use limit of 100 email slots per team.
The picture
Drawn side by side.
Warm-up headroom, as dots
One dot is one mailbox for Warmerly and one email slot for Skylead
WarmerlySkylead
Warmerly
Starter: 5 mailboxes, each warmed on the ramp below.
Skylead
Infinite email warm-up, under a fair-use limit.
100 email slots per team. More can be requested from its support. We read a slot as one email account.
Warmerly's limit is the number of mailboxes in your plan. Skylead's limit is stated in a tooltip and its terms, next to wording that says infinite and unlimited.
| Product | Limit |
|---|---|
| Warmerly Starter | 5 mailboxes |
| Warmerly Growth | 25 mailboxes |
| Warmerly Agency | 100 mailboxes |
| Skylead | 100 email slots per team, fair use |
The warmup ramp, drawn
Warmup emails a day, per mailbox, over the first 30 days
WarmerlySkylead
- Warmerly: 4 a day at day 0, 8 at day 3, 15 at day 7, 25 at day 14, 35 at day 21, 50 at day 30, cut by provider cap (Gmail 40, Outlook 30), weekends and health.
- Skylead: you set a daily maximum and warm-up ramps up gradually from there. No schedule is published.
Warmerly's curve is drawn from the anchor points in its capacity code. Real limits vary by mailbox and provider.
Who does what
From the product pages
WarmerlySkylead
Warmerly
Connect the mailboxWarmup starts by itselfThreaded repliesSpam rescue
Skylead
Connect the email accountSwitch warm-up onSet a daily maximumCheck status per account
Skylead's page says setup takes a few minutes. It does not say how warm-up mail is written or whether the pool is shared.
On screen
What it looks like.
WarmerlySample data
How Warmerly does it
Warmerly, in detail.
Warmerly warms each mailbox on a ramp set by Warmerly: 4 a day at day 0, 50 a day by day 30, then cut by provider cap, weekends, spam placement and health. Warmup sends are not a billing meter, but every mailbox follows the ramp.
01
The ramp, from anchor points
The daily quota is interpolated between anchors: 4 a day at day 0, 8 at day 3, 15 at day 7, 25 at day 14, 35 at day 21 and 50 at day 30. It counts days the mailbox really sent, so a paused or newly enabled old mailbox cannot skip ahead. Domain age is not an input.
Warmerly product, checked 21 October 2026
02
The ceiling is the lowest of three limits
The quota is the lowest of the age ramp, the provider cap and the hard ceiling of 50 a day. Provider caps are Gmail 40, Outlook 30 and Zoho 25. Worked through the ramp, a Zoho mailbox reaches its cap of 25 at day 14, an Outlook mailbox passes 30 at day 18 and a Gmail mailbox reaches 40 at day 24.
Warmerly product, checked 21 October 2026
03
Weekends and health cut it further
Weekends run at 0.6 of the weekday quota, measured in the mailbox's own timezone, so a mature mailbox on the 50 ceiling plans 30 on a weekend, a mature Gmail mailbox 24, Outlook 18 and Zoho 15. A spam placement score of 20 or more multiplies the quota by 0.4 and 10 or more by 0.7. A health score below 50 multiplies it by 0.4 and below 70 by 0.75. The lower of the two reductions applies.
Warmerly product, checked 21 October 2026
04
The reason for today's limit is named
The capacity calculation returns a named limiting factor for each mailbox (age, provider, hard cap, health, weekend, your own daily limit and others) and the warmup page reads it. You can set a lower daily warmup limit yourself. A free sandbox mailbox is capped at 3 a day.
Warmerly product, checked 21 October 2026
05
A peer pool, with terms
Warmup mail is real mail between mailboxes in one pool that includes other customers' mailboxes. A sender does not write to the same recipient twice within 72 hours, relaxing to 48 and then 24 if the pool runs short.
Warmerly product, checked 21 October 2026
06
What it does not do
Warmup does not warm a LinkedIn profile: LinkedIn account warmup is a separate feature of the LinkedIn add-on.
Warmerly product, checked 21 October 2026
How Skylead does it
Skylead, in detail.
Infinite email warm-up, delivered through a partner, switched on per account, with a fair-use cap stated in the small print.
01
Infinite, through a partner
Its warm-up page says the feature comes from a partnership with Mailivery and helps you warm up an unlimited number of email domains. It is ticked on All-in-one.
skylead.io/email-warm-up · read 21 October 2026
02
A 100-slot fair-use limit
A tooltip on its pricing table and its terms both say the infinite warm-up runs under a Fair Use Policy, with a 100-email slot limit per team. More slots are available by asking support, from an address on a valid corporate domain.
skylead.io/pricing · read 21 October 2026
03
You set a daily maximum
You set the maximum number of emails the partner can send per day, and warm-up ramps up gradually from there. The page gives no numbers.
skylead.io/email-warm-up · read 21 October 2026
04
Status per account
Each connected email account's warm-up status is shown in one place.
skylead.io/email-warm-up · read 21 October 2026
05
Works with any provider
The page says warm-up is compatible with all email providers and custom SMTP.
skylead.io/email-warm-up · read 21 October 2026
What Skylead does not say
We looked, and found no statement on these. That is about its published pages only, not about the product.
- A warm-up schedule or daily volumes
- What a slot is (we read it as one connected email account, but its pages do not define it)
- How warm-up emails are written, or whether they are threaded replies
- Whether the warm-up pool is shared with other customers
Where the sources disagree
We report each version rather than pick one.
- The warm-up partner is Mailivery, with support at support@skylead.io, in one tooltip and its terms, and InboxFlare, with support at support@inboxflare.ai, in another tooltip and in its page address. We report both.
- 'Infinite' and 'unlimited' warm-up sit next to a 100-email slot limit per team. We report both.
The numbers
Only what we could verify.
| Measure | Warmerly | Skylead |
|---|---|---|
| Mailbox warmup | On every mailbox: threaded conversations with quoted replies and spam rescue, on a ramp from 4 a day to 50. | Infinite email warm-up through a partner, under a fair-use limit of 100 email slots per team. |
| Warmup | On every mailbox in the plan | Infinite email warm-up, through a partner |
| Limit | 5 mailboxes on Starter, 25 on Growth, 100 on Agency | 100-email slot limit per team, under fair use |
| Ramp | 4 a day at day 0, 50 a day by day 30 | Gradual, up to a maximum you set; no numbers |
| Partner | A peer pool, with terms | Mailivery, also named InboxFlare |
In practice
What it means for you.
Our reading of the facts above. Not a promise, and not the only reasonable reading.
Both limit warm-up, in different ways
Warmerly's limit is the mailboxes your plan covers, and you see today's limit and why. Skylead's is 100 slots per team, found in a tooltip and the terms.
Skylead's headline says infinite
Its feature table and warm-up page say infinite and unlimited. The 100-slot limit is stated elsewhere, so read both before you plan around it.
Warmerly shows its working
The ramp, the provider caps, the weekend reduction and the health cuts are written down, and the warmup page names the factor that limits each mailbox today.
Who it suits
Pick the one that fits.
Warmerly
Warmerly is the better fit if
- You send cold email and want the mailbox warmed for you
- You want the daily limit explained and shown
- You want the ramp written down before you start
Skylead
Skylead is the better fit if
- You want warm-up bundled in a seat with unlimited email accounts for campaigns
- You will stay inside 100 warm-up slots, or ask support for more
Questions
How does Skylead warm up email?
Through a partner, named as Mailivery or InboxFlare. It lists infinite warm-up under a fair-use limit of 100 email slots per team.
How does Warmerly ramp warmup?
On a published ramp from 4 a day at day 0 to 50 a day by day 30, on every mailbox in your plan.
Does Skylead publish its warm-up numbers?
No. It describes a gradual ramp up to a maximum you set, without numbers.
How many mailboxes can warm on Warmerly?
5 on Starter, 25 on Growth and 100 on Agency.
Sources
Skylead 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.
More features
- All features
- Main job
- Starting price (per month)
- What the price covers
- Free trial
- LinkedIn automation
- LinkedIn warm-up and limits
- Smart sequences and conditions
- Image and GIF personalisation
- SPF, DKIM and DMARC checks
- Email sending and mailboxes
- Reply inbox
- Lead finding and verification
- Agency and team features
- Integrations and API
- Where data is held
See it on your own mailbox.
Connect a mailbox. Warmerly runs alongside whatever you send from now, so you can compare before you move anything.
Free plan, no card. Paid plans: 7-day trial, first charge on day 8.