Best Email Warm-Up Tool for Gmail: 2026 Comparison

The best email warm-up tool for Gmail is the one that fits your connection method, budget and pool risk: OAuth or app password, free or paid, private or shared. Choose wrong and you may pay for volume you cannot safely use, or connect through an app flow your admin blocks. This guide compares seven Gmail-ready tools on the facts that matter.

How did we rank them?

This comparison is for Gmail and Google Workspace. Outlook support is shown because many teams use both, but it is not a positive ranking factor for this Gmail-specific list.

The ranking uses six checks:

1. Is there a permanent free plan?
2. Does the vendor list Gmail or Google Workspace support?
3. What is the cheapest paid entry point?
4. Is daily warm-up volume stated?
5. Is the pool private or shared?
6. Are connection trade-offs clear?

Prices and competitor facts were read on 3 October 2026 from vendor pricing pages. Check before you buy, because prices and limits change.

Pool type matters. A private pool only uses mailboxes you own. A shared network exchanges messages with other users or vendor-operated inboxes. If you are choosing between those models, read private warm-up pools versus public networks before you connect Gmail.

For setup details, keep the Google Workspace warm-up guide open while you compare. Your Gmail connection method affects admin approval, app-password availability and Google verification warnings.

How do the tools compare?

BobWork ranks first because this method favours a permanent free Gmail option, transparent limits and the choice of a shared network or a private pool. It is not first for Outlook because it does not support Outlook or Microsoft 365 yet.

Best email warm up tool for Gmail?

1. BobWork Email Warm-up

BobWork Email Warm-up is free, with no credit card, no time limit and up to 20 mailboxes per account.

It fits Gmail and Google Workspace users who want free warm-up with a choice of model. By default your mailboxes warm in the shared network; switch the account to Private pool and only your own mailboxes write to each other.

The limits are clear. A private pool needs at least two mailboxes. Outlook and Microsoft 365 are not supported yet because Microsoft requires OAuth. Google sign-in uses the gmail.modify scope, and Google shows an unverified-app notice because the CASA audit has not been completed. Gmail can also connect by IMAP with an app password.

The engine starts at 3 emails per day, adds 2 per day, and caps at 30 per day by default. The cap is editable per mailbox up to 100. Weekends run at 30%. Sends are spread across 09:00–18:00 in the mailbox’s own time zone. The warm-up strategy explains the schedule.

2. Warmup Inbox

Warmup Inbox has no free plan. Its cheapest paid plan is $19/month monthly or $15/month annually per inbox, with a 7-day no-card trial.

It fits Gmail users who want a paid shared network with a stated entry price and stated Basic volume. The Basic plan lists 75 warm-up messages per day and replies up to 25%. Pro and Max list higher daily volumes.

The provider list is broad: Gmail, Workspace, Outlook, Microsoft 365, Yahoo, Zoho, ProtonMail, Fastmail, iCloud, AWS SES, Mailgun and any SMTP. The trade-off is the shared network model. Your mailbox warms with other inboxes, not only mailboxes you own.

3. MailReach

MailReach has no free plan. Its cheapest monthly price is $19.50 per mailbox per month, with 20% off annually.

It fits Gmail users who want a paid per-mailbox model and a stated high ceiling. Its pricing page says up to 100 warming emails per day. Treat that as a maximum, not a starting point for a new Gmail account.

MailReach lists any SMTP, including Gmail/Workspace, Outlook/O365, Zoho, Brevo, Mailjet, Mailgun, SendGrid, SES, Sparkpost, Ionos and OVH. Its network is described as Workspace/O365 inboxes, 30k+. That means it supports Outlook, but it is not a private-only pool.

4. Lemwarm

Lemwarm has no free plan. Essential is $29/month monthly or $24/month annually per email address.

It fits Gmail users already considering lemlist. The competitor facts state that lemlist offers 14 days no card and bundles lemwarm. A standalone lemwarm trial was not stated on its pricing page.

The pricing page does not state the cheapest plan’s daily warm-up volume. It lists Gmail and Outlook one-click, mentions Zoho, FastMail and Proton, and supports SMTP. Its shared pool is described as 20,000+ real domains in 100+ countries.

5. Instantly

Instantly has no free plan. Growth is $47/month for the outreach platform, with unlimited email accounts and unlimited warm-up stated on its pricing page.

It fits Gmail users who want warm-up inside an outreach platform, not a standalone warm-up tool. The pricing page says Start free and no card, but the trial length is not stated in the competitor facts.

Its provider list is narrower than several tools here. It lists Google Workspace and Microsoft Outlook. Daily warm-up volume per mailbox is not stated on the pricing page, so verify it before using high-volume assumptions.

6. Warmy

Warmy has no free plan. Its pricing page says from $49/month and offers a 7-day no-card trial.

It fits Gmail users who want a large shared network and broad provider coverage. The page lists 1M+ real mailboxes and says any ESP, with 35+ providers listed, including Gmail, Outlook, Zoho, SES, Mailgun and SendGrid.

The limit is pricing clarity. Tier prices were not readable on the page in the competitor facts, and the cheapest plan’s daily warm-up volume was not stated. Verify the exact tier before purchase.

7. Mailwarm

Mailwarm has no free plan and no traditional free trial. Starter is $69/month for 1 mailbox.

It fits Gmail users who want a vendor-operated pool and accept a higher entry price. Starter lists up to 50 warm-up emails plus 50 replies per day. Growth and Scale list higher plan-level volumes.

Mailwarm lists Google Workspace/Gmail, Microsoft 365/Outlook and other SMTP platforms. Yahoo, Zoho, AWS, SendGrid and Mailgun are named. Its pool is described as 50,000+ aged real inboxes, so it is a shared or vendor-operated model rather than a private pool.

What Gmail rules matter?

Gmail warm-up only helps if your authentication, complaint rate and sending pace are sound.

Google’s Email sender guidelines say you should keep spam complaint rates below 0.1% and avoid ever reaching 0.3%. Treat that as a campaign guardrail, not a warm-up target.

Google also publishes Gmail sending limits. Check the current limit for your account type before sending. Newer accounts, trial environments and recently configured domains often need a slower ramp than established workspaces.

Connection method matters too. Google app passwords require the right security setup, usually 2-Step Verification. OAuth may require admin approval, and Google’s app verification process explains why some apps show warnings.

Warm-up is not a permission slip. If DKIM is missing, your list is scraped, or your copy drives complaints, no tool can safely force Gmail placement.

If you are diagnosing a current problem, start with why Gmail emails go to spam before changing tools. Tool switching rarely fixes authentication or complaint issues.

Where does each tool fit?

Use BobWork when cost and privacy are the constraints. It is the only permanent free plan in this comparison, and its optional private pool avoids sending warm-up mail to strangers’ inboxes. It is not right if you need Outlook today.

Use Warmup Inbox when you want the lowest listed paid entry among the shared-network tools in this table. Its Basic plan also states daily warm-up volume, which makes it easier to compare.

Use MailReach when a per-mailbox paid tool with a stated 100/day ceiling fits your process. Do not treat the ceiling as a recommendation for a new Gmail account.

Use Lemwarm when you are already evaluating lemlist. The standalone price is clear, but daily warm-up volume is not stated in the competitor facts. Ask before assuming it matches your desired ramp.

Use Instantly when warm-up is secondary to an outreach platform. Its pricing page says unlimited email accounts and unlimited warm-up, but per-mailbox volume is not stated.

Use Warmy when provider breadth and a large shared network are your priorities. Verify exact tier pricing and daily volume before committing.

Use Mailwarm when you want Mailwarm’s operated pool and can justify the Starter price. It lists up to 50 warm-up emails plus 50 replies per day for one mailbox.

What should you check first?

The free BobWork pool does the rescue step automatically for its own warm-up messages. Warm-up mail found in Spam is moved to Inbox, marked read, labelled Warm-up, and archived after 24 hours.

It only touches mail carrying the engine’s hidden header, or a known subject for Zoho API senders. Real mail is never read, moved or answered.

Direct spam-landings measurement is more useful than assuming placement from seed lists alone. If receiving mailboxes keep finding warm-up messages in Spam, slow down before sending real outreach.

Which constraint decides?

If you need the lowest cost for Gmail, choose the permanent free plan in the table. That points to BobWork Email Warm-up, with clear limits: no Outlook yet, and Google’s unverified-app notice for Google sign-in.

If you need Outlook and Gmail together, BobWork should not be your pick today. Every competitor in the table lists Outlook support. Use the price, trial and daily-volume columns to choose a paid shared-network option.

If you need the clearest paid entry price, Warmup Inbox and MailReach are easiest to compare. Both have low per-inbox or per-mailbox monthly entry prices and stated warm-up volumes.

If you need an outreach suite, Instantly belongs on your shortlist. Verify per-mailbox warm-up volume and Gmail sending behaviour before you scale.

If you are unsure how long to warm up, use a day-by-day plan instead of guessing. The email warm-up timeline gives a practical ramp. For a broader definition of pools, read what an email warm-up network is.

The next step is not to buy the biggest number in a pricing table. Connect two controlled Gmail or Google Workspace mailboxes, confirm SPF, DKIM and DMARC, warm for at least 14 days, then send real outreach slowly. If you want to do that without a card, start with the free tool and keep the checklist beside your first campaign.

Common Gmail warm-up questions

What is the best Gmail warm-up tool?

If you need a permanent free option, BobWork ranks first by this guide’s method because it is free, supports Gmail and Google Workspace, and allows up to 20 mailboxes. If you need Outlook support, choose a paid tool that lists Outlook.

Should I use OAuth or app password?

Use the method your organisation permits. OAuth may require admin approval and can show verification warnings. App passwords can work when 2-Step Verification is enabled and your admin allows them.

Does warm-up guarantee inbox placement?

No. Warm-up can build normal sending and reply patterns, but it cannot guarantee inbox placement. SPF, DKIM, DMARC, complaint rate, content quality, list quality and sending behaviour still decide where mail lands.

How long should Gmail warm-up run?

Use 14 days for an existing domain and 3–4 weeks for a new domain. Keep campaign volume conservative and watch spam landings, bounces and complaints before increasing outreach.

Can one Gmail mailbox warm up alone?

Yes, in a shared network: one mailbox pairs with other users’ active mailboxes, which is BobWork’s default. If you switch the account to a private pool, you need at least two mailboxes so they can exchange messages.

What complaint rate should I target?

Google says to keep spam complaint rates below 0.1% and avoid ever reaching 0.3%. Treat those as hard guardrails for real campaigns. Warm-up does not fix unwanted mail.

Do these tools support Google Workspace?

All listed tools state Gmail, Google Workspace or Google/Workspace support in some form. Check the vendor’s current connection steps before buying, especially if your admin blocks third-party apps or app passwords.

Frequently asked questions