day1
startingbase target: 5
The default base target starts at five. The cohort may offer fewer: every peer must be healthy, available, and on a different registrable domain.
Day 0 · sending history: none
Every new mailbox
starts out ice cold.
Warming it up costs $0.
Warmup is not a magic inbox switch. It is controlled reputation work: small domain-safe cohorts, gradual volume, short conversations, and a final capacity check before every send. Norbelys includes it with every plan on unlimited connected mailboxes.
Norbelys
warmup · itemized
- Warmup network access$0.00
- Automatic junk rescue$0.00
- Reputation-aware ramp$0.00
- Mailboxes 10 — or 50, or 200$0.00
Total due$0.00
included with every plan from $29/mo
thank you for not paying twice
A mailbox ramp, without invented outcomes
A target is a ceiling.
Safety decides the actual volume.
day4
stable cohortbase target: 11
The cohort remains stable for its first three days. On day four, relationship memory begins shaping a gradual rotation instead of rolling random peers again.
day9
learningsafety gates apply
Short conversations can continue, but only for three days or three turns. Pair and domain exposure prevent the same small circle from manufacturing endless replies.
day17
guardedhealth-shaped
If a provider or mailbox reports trouble, warmup backs off. A planned slot is still revalidated immediately before transport, so stale work does not slip through.
day28
review pointbase ceiling: 40
There is enough history to make a decision, not a guaranteed launch date. Authentication, placement, bounces, complaints, list quality, and your campaign target must all agree.
Base targets use the default 5-message start, +2 per ramp day, and 40-message ceiling. Actual sends can be lower and no placement outcome is implied by this illustration.
Smart cohorts
A pool should remember.
Not keep rolling dice.
Norbelys groups four to ten healthy mailboxes, with eight as the target and a different registrable domain for every member. Pair history, domain exposure, conversations, rotation, and cooldown all influence the next match.
- Same organization is allowed when the domains differ; the same registrable domain is always blocked.
- A cohort stays stable for three days, then rotates no more than 25% in one day.
- A separated pair waits 14 days before it can meet again.
One truthful limit
Your campaign reserves capacity first.
Providers see one mailbox, so Norbelys uses one mailbox-wide daily limit. Due campaign work reserves first; warmup can use only what remains. Immediately before transport, the system checks health, domain separation, membership version, spacing, and idempotency.
Removed means removed
Future slots are invalidated. A stale queued job becomes a no-op.
No Reply-To leak
Warmup replies return to the From mailbox, never a campaign route.
No visible fingerprint
Internal message identity replaces a warmup label in the copy.
Fail closed
If coordination is unavailable, warmup pauses without a legacy fallback.
The other receipt
Ten mailboxes.
Do the multiplication.
Some outreach platforms include warmup. Dedicated deliverability products may price it by mailbox. The receipt below uses one public example so the comparison stays checkable instead of pretending every competitor has the same package.
Stop paying per mailboxStandalone warmup tool
monthly · per mailbox
- Warmup × 10 mailboxes$250
- Sending platformsold separately
- Analytics & DMARCsold separately
Total / mo$250+
MailReach monthly example checked July 13, 2026 —
verify the current public price
Warmup questions
Straight answers
01How long does email warmup take?+
Use two weeks as a minimum observation period for a new low-volume mailbox, not a launch promise. A new domain or a materially higher target can need four to eight weeks. Launch only when authentication, placement, bounces, complaints, and list quality agree.
02Can I skip warmup and just start sending?+
An established mailbox can already have useful history, but a new or long-quiet sender should not jump straight to campaign volume. Google and Microsoft explicitly recommend gradual, consistent ramping. Warmup helps create controlled history; it does not override provider policy or recipient complaints.
03What exactly do the warmup emails contain? Do they bother real people?+
Warmup messages travel only between eligible mailboxes in the Norbelys network, never to your prospect list. Cohorts are small, every peer uses a different registrable domain, and conversations are bounded. Credentials and campaign content are never shared with another participant.
04Does it work with Gmail, Outlook and my own SMTP?+
Yes — Gmail and Google Workspace, Outlook and Microsoft 365 via one-click OAuth, and almost any other mailbox over IMAP/SMTP. Warmup runs the same way on all of them.
05Why is warmup free when other tools charge for it per mailbox?+
Because warmup, sender health, DMARC, and campaign delivery should operate as one system. Some outreach platforms also include warmup; dedicated warmup products may charge by mailbox. Norbelys includes it on unlimited connected mailboxes in every plan from $29/mo.
06What happens if a mailbox's reputation dips during warmup?+
The sender's health and capacity gates can reduce or defer warmup. Campaign work reserves the shared mailbox limit first, and a serious authentication or delivery problem removes the sender from new matching until it is healthy again.
07Does warmup reuse my campaign Reply-To address?+
No. Warmup replies always return to the mailbox in the From address. Campaign-only Reply-To routing is intentionally excluded, so a prospect reply workflow can never leak into a warmup conversation.
08Can two addresses on the same domain warm each other?+
No. Two mailboxes on the same registrable domain can never exchange warmup messages, even across different organizations or subdomains. Mailboxes in the same organization are allowed only when their registrable domains differ.
Want the longer read? How email warmup actually works →
Readiness review · signals decide
Connect a mailbox today.
Launch when the signals agree.
Turn warmup on, let the controlled history build, and use authentication, placement, health, and list quality — not a calendar promise — to decide when the mailbox is ready.
from $29/mo · 3,000 emails/month on Starter · cancel anytime