kitio.aiAdded Oct 29, 2026
Warmbox
From $19/moEmail warm-up that builds inbox reputation for cold outreach
What is Warmbox?
Warmbox warms up sending inboxes so cold emails are less likely to land in spam. It exchanges automated interactions between connected mailboxes and is aimed at sales teams, agencies and startups.
It connects to Gmail, Outlook, Yahoo, iCloud, Zoho, Amazon SES, SendGrid, Mailgun and others, and any inbox can be added over SMTP. Features include automated interactions, auto-replies and automatic removal from spam folders.
Plans are priced by the number of inboxes warmed, daily email volume and team members. Annual billing lowers the monthly price on each tier.
Features
- Inbox warm-up
- Automated interactions
- Auto-reply
- Spam removal
- SMTP support
- Multi-provider support
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Organization
Warmbox
Listed by kitio.ai · unverified owner
Pricing
- Pricing model
- Paid
- Paid options from
- $19/mo
- Billing frequency
- Monthly
Warmbox plans
Solo
$19/mo
- 1 inbox
- 50 emails a day
- 1 team member
Start-up
$79/mo
- 3 inboxes
- 250 emails a day
- 3 team members
Growth
$159/mo
- 6 inboxes
- 500 emails a day
- 6 team members
Prices in USD, checked Oct 29, 2026. Plans change often, so confirm on the Warmbox site.Official pricing
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Pros and cons
Pros
- Works with many email providers
- Any inbox can be added over SMTP
- Same features on every plan
Cons
- Priced per inbox
- No free plan listed
- Does not send your outreach itself
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Q&A
What is Warmbox?
Warmbox warms up sending inboxes so cold emails are less likely to land in spam. It exchanges automated interactions between connected mailboxes and is aimed at sales teams, agencies and startups.
Can I warm up a custom domain mailbox?
Yes. Beyond the named providers, any inbox can be added through SMTP.
Do all plans have the same features?
The pricing page says the warm-up features are included in all plans. Plans differ in inbox count, daily volume and team size.
How much does Warmbox cost?
Warmbox is paid, with paid plans from $19/mo.
Is there a free version of Warmbox?
No. Warmbox is a paid tool.
What are the main features of Warmbox?
Inbox warm-up, Automated interactions, Auto-reply, Spam removal, SMTP support, Multi-provider support.
Who makes Warmbox?
Warmbox is made by Warmbox.
What are the best alternatives to Warmbox?
Popular alternatives include Hunter, lemlist, Instantly.