13 Best Email Warmup Tools in 2026 (Prices Compared)

The best email warmup tools in 2026 fall into two groups: standalone warmup services (Warmbox, Warmy, MailReach, Warmup Inbox, TrulyInbox, Mailwarm, lemwarm), priced per mailbox from about $15 to $79 a month, and cold email platforms with warmup included (Instantly, Smartlead, lemlist, QuickMail, Mailshake, Woodpecker), where warmup comes free with a sending plan from $29 a month. If you already send cold email from one of those platforms, use its built-in warmup; buy a standalone tool only if you send from Gmail or Outlook directly or need warmup on many mailboxes.

Warmup is not a fix for missing authentication or a bad list, though. Since 2024, Gmail, Yahoo and Microsoft require SPF, DKIM and DMARC from high-volume senders, and Gmail and Microsoft now reject non-compliant mail. Get those right first (details below), then warm up.

All prices below were checked on each vendor's official pricing page in October 2026, in USD. They change often: click through before you buy.

What is an email warmup tool?

An email warmup tool connects to your mailbox and automatically exchanges emails with a network of other mailboxes: it sends messages, and the network opens them, replies, marks them as important and pulls them out of spam. The volume grows gradually over days and weeks. The goal is to build a sending history that looks like normal, positive activity before you start cold outreach from a new domain or mailbox, and to keep that reputation up while campaigns run.

Most tools also report where your emails land (inbox, promotions or spam) so you see deliverability problems before your prospects do.

Email warmup tools compared (October 2026)

Standalone email warmup tools

Warmbox

Warmbox does one thing: automated warmup. Plans are sized by inboxes and daily warmup volume: Solo at $19/month (1 inbox, 50 emails/day), Start-up at $79 (3 inboxes, 250/day) and Growth at $159 (6 inboxes, 500/day), or $15, $69 and $139 a month billed yearly. A good fit if you have a handful of mailboxes and send from Gmail or Outlook directly.

Warmy

Warmy is a dedicated warmup service driven by its own AI engine. Public pricing now only says "plans starting from $49/month", split into B2B sender, B2C sender and custom tracks, with a demo for larger needs. There's a 7-day free trial without a card. Woodpecker uses Warmy (or Mailivery) to power its own built-in warmup.

MailReach

MailReach bills per mailbox: $25 a month each for 1 to 5 mailboxes, falling to $16 from 51 mailboxes ($20 and $12.80 billed yearly). Each mailbox warms up to 100 emails a day, and plans include spam test credits to check inbox placement. Its pricing scales well for agencies running dozens of mailboxes.

Warmup Inbox

Warmup Inbox offers three tiers per inbox: Basic $19 (75 warmup emails/day), Pro $59 (250/day) and Max $99 (1,000/day), with lower yearly prices and volume discounts. 7-day free trial, no card required.

TrulyInbox

TrulyInbox prices by total warmup emails per day rather than per mailbox, with unlimited accounts on every plan: Starter $29/month (200 emails/day), Growth $99 (1,000/day), Scale $199 (3,000/day). It's the only tool here with a permanent free plan (1 account, 10 emails a day), enough to test the dashboard.

Mailwarm

Mailwarm is the premium option: Starter $79/month for 1 mailbox at 50 emails a day, Growth $189 for 3 mailboxes, Scale $549 for 10 mailboxes (cheaper billed yearly). No free trial.

lemwarm

lemwarm is lempire's warmup tool, also sold on its own: Essential $29 per email account per month and Smart $49 ($24 and $40 billed yearly). It's included free in every lemlist plan, so buy it separately only if you don't use lemlist.

Cold email tools with warmup included

If you need a sending tool anyway, these include warmup in the price.

Instantly

Instantly includes unlimited email accounts and unlimited warmup on every outreach plan: Growth $47/month (5,000 emails and 1,000 contacts a month), Hypergrowth $97, Light Speed $358, about 20% less billed yearly. 14-day free trial. A good fit when you run many mailboxes; we compared it with other options in our Instantly alternatives guide.

Smartlead

Smartlead also offers unlimited email accounts with AI warmup. Plans: Base $39/month, Pro $94, Unlimited Smart $174 and Unlimited Prime $379 (about 17% off yearly). Higher plans get access to higher-quality warmup pools. Free trial, no card.

lemlist

lemlist includes lemwarm in all plans. The Email plan costs $69/month ($55 yearly) with unlimited users and email senders; the Multichannel plan costs $109 ($87 yearly). 14-day free trial.

QuickMail

QuickMail includes its AutoWarmer free with MailFlow in every plan: Starter $49/month (5,000 emails), Growth $99, Agency $299, all with unlimited email senders. 14-day free trial.

Mailshake

Mailshake includes unlimited email warmup in every plan. Starter is $29/month for 1 email address and 1,500 sends, Email Outreach $49 with unlimited sends, Sales Engagement $99. No free trial: Mailshake collects payment up front.

Woodpecker

Woodpecker prices by the number of prospects you contact per month, from $35/month for 500 prospects, with unlimited email accounts. Each plan includes free warmups powered by Mailivery or Warmy (2 on the entry plan), and extra warmups cost $5 per email account per month. Free trial of 14 days or 100 messages.

Tools from older lists that aren't warmup tools

• Folderly is a deliverability platform. In 2026 it explicitly says it is not a warmup tool, and its core product starts at $96 per mailbox per month (billed yearly, via a demo).
• Brevo (formerly Sendinblue) is an email marketing platform for newsletters and transactional email. It doesn't warm up mailboxes; its free plan lets you send up to 300 emails a day.

Gmail, Yahoo and Microsoft sender requirements (what warmup can't fix)

Warmup builds reputation, but inbox providers now check authentication first. If these aren't in place, no amount of warmup will help.

Even below these thresholds, Gmail asks every sender to set up SPF or DKIM, valid reverse DNS and TLS, and to keep spam complaints under 0.3% (Google sender guidelines). For cold outreach, set up all three records (SPF, DKIM, DMARC) on every sending domain, whatever your volume.

Is email warmup against Google's rules?

Google doesn't name warmup tools in its guidelines. What it does recommend is to "start with a low sending volume to engaged users, and slowly increase the volume over time", which is warmup done by hand. Its developer policies also ban apps that use multiple accounts to "circumvent filters and spam". Automated warmup networks generate artificial engagement, so treat them as a support for a sound setup, not a guarantee. You'll see claims online that Google "banned" warmup tools; we found no Google source for that.

How to choose an email warmup tool

1. Already using a cold email tool? Use its built-in warmup (Instantly, Smartlead, lemlist, QuickMail, Mailshake, Woodpecker). Paying twice rarely improves results.
2. Sending from Gmail or Outlook directly, with 1 to 5 mailboxes? A per-mailbox tool such as Warmbox, Warmup Inbox or MailReach is the simplest.
3. Many mailboxes (agency, multiple domains)? Look at pricing that doesn't scale linearly per mailbox: TrulyInbox (unlimited accounts), Instantly or Smartlead (unlimited accounts), MailReach's volume tiers.
4. Check the placement reports. The useful part of a warmup tool is knowing whether you land in the inbox, promotions or spam, not the raw volume of warmup emails.

Warmup won't save a bad list: what matters more

• Verify every address before sending. Bounces hurt your reputation faster than warmup rebuilds it. Use an email finder that verifies addresses, or a dedicated verifier, before any campaign (see also our list of free email finding tools).
• Send from a secondary domain (for example getyourcompany.com) so your main domain's reputation is protected.
• Keep volume per mailbox modest and spread sending over several mailboxes rather than pushing one.
• Write emails people want to answer. Relevance is the best deliverability signal there is: replies tell Gmail and Outlook your emails are wanted. Our cold email tips and follow-up templates cover the copy.
• Add another channel. LinkedIn messages don't depend on email deliverability. useArtemis runs sequences that mix LinkedIn steps and email steps sent from your own Gmail, Outlook or SMTP mailbox at a human pace, and its email finder verifies addresses before you send.

FAQ

What is the best email warmup tool?

If you already use a cold email platform, the best warmup tool is the one built into it: Instantly, Smartlead, lemlist, QuickMail, Mailshake and Woodpecker all include warmup. If you send from Gmail or Outlook directly, standalone tools like Warmbox, Warmup Inbox or MailReach are the simplest, from about $15 to $25 per mailbox per month.

Is there a free email warmup tool?

TrulyInbox has a permanent free plan limited to 1 account and 10 warmup emails a day. Otherwise, free options are trials: Warmy and Warmup Inbox (7 days), Instantly, lemlist, QuickMail and Woodpecker (14 days), Smartlead (free trial).

How long does email warmup take?

There's no official number from Google or Microsoft. Most vendors and practitioners recommend two to four weeks of warmup before real campaigns on an existing domain, and longer for a domain registered in the last few months. Keep warmup running at low volume while your campaigns are live.

Do I still need warmup if my SPF, DKIM and DMARC are set up?

Authentication is the entry ticket, not a reputation. A new domain or mailbox with perfect records but no sending history can still land in spam, so a gradual ramp-up (by hand or with a tool) is still worth it for cold outreach.

Is Brevo or Folderly an email warmup tool?

No. Brevo is an email marketing platform for newsletters and transactional email, and Folderly is a deliverability platform that states it is not a warmup tool. Both appeared in older warmup lists, including an earlier version of this article.