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Warmforge
What it is
Warmforge is an email warm-up and deliverability tool for Google Workspace and Outlook mailboxes. It uses AI-written messages to imitate human mailbox behavior and warms accounts automatically; the service recommends at least two weeks before outreach. Health Checks review DNS and MX records and check blacklist status. Placement tests report delivery rates across email providers, while monitoring covers inbox placement, sender reputation, authentication, and blocklists. Warmforge says it removes warm-up messages that reach spam. Its pool is described as curated, built from aged accounts, and dominated by Google Workspace and Microsoft 365 mailboxes. Features can be explored for free, but warming requires purchased mailbox slots. Each slot covers one mailbox, and mailboxes beyond the purchased count are disabled for warm-up. Email Warm Up costs $10 a month, billed per month and quarterly, with one free slot and one free placement test monthly. Placement Tests Pro costs $39 monthly for 100 tests; Growth costs $169 monthly for unlimited tests.
For and against
For
- Automates AI-written mailbox warm-up
- Checks DNS, MX, and blacklist status
- Includes one free placement test monthly
- Supports Google Workspace and Outlook
- Offers API access and Forge CLI
Against
- Mailbox warming requires purchased slots
- Each slot covers only one mailbox
- Warmforge recommends at least two weeks before outreach
- Email Warm Up costs $10 monthly
The verdict
Warmforge combines mailbox warming, health checks, placement testing, and deliverability monitoring. Account for slot requirements and the recommended preparation period when planning outreach.
Who it suits
Warmforge fits senders preparing Google Workspace or Outlook mailboxes for outreach and monitoring delivery health. It also suits users needing API access or Forge CLI mailbox management.
Plans and prices
Email Warm Up
1 free slot included · automated AI email warm up · 1 free placement test per month · DNS and MX health checks
Read 8 Oct 2026 · warmforge.ai
Placement Tests Pro
100 tests per month · 50 mailboxes per test
Read 8 Oct 2026 · warmforge.ai
Placement Tests Growth
Unlimited tests · 250 mailboxes per test
Read 8 Oct 2026 · warmforge.ai
On the record
- API and CLI
- Warmforge offers API access, and the Forge CLI supports Warmforge mailbox management, warm-up stats, and placement tests.help.salesforge.ai · read 8 Oct 2026
- Cancellation
- Warmforge says mailbox slot and placement test subscriptions can be canceled at any time.warmforge.ai · read 8 Oct 2026
- Deliverability boost
- Warmforge says it automatically removes warm-up emails that land in spam.warmforge.ai · read 8 Oct 2026
- Email providers
- Warmforge works with Google Workspace and Outlook mailboxes.warmforge.ai · read 8 Oct 2026
- Free access
- Users can explore Warmforge features for free, but the site says there is no free trial for warming mailboxes because mailbox slots must be purchased.warmforge.ai · read 8 Oct 2026
- Health checks
- Health Checks monitor mailbox DNS and MX records and check blacklist status.warmforge.ai · read 8 Oct 2026
- Mailbox slot limit
- Each mailbox slot covers one mailbox, and mailboxes beyond the purchased slot count are disabled for warm-up.warmforge.ai · read 8 Oct 2026
- Placement tests
- Placement tests report mailbox delivery rates to different email service providers, and each Warmforge plan includes one free test per month.warmforge.ai · read 8 Oct 2026
- Product
- Warmforge is an email warm-up and deliverability tool that mimics human mailbox behavior using AI-written emails.warmforge.ai · read 8 Oct 2026
- Salesforge
- Salesforge users get unlimited Warmforge mailbox slots at no extra cost.warmforge.ai · read 8 Oct 2026
- Security
- Warmforge's homepage states that it is SOC 2 compliant.warmforge.ai · read 8 Oct 2026
- Support
- The site says users can contact support via chat.warmforge.ai · read 8 Oct 2026
- Warm-up
- The product warms mailboxes automatically and recommends warming them for at least two weeks before outreach.warmforge.ai · read 8 Oct 2026
- Warm-up pool
- The warm-up pool is described as curated, made up of aged accounts, and dominated by Google Workspace and Microsoft 365 mailboxes.warmforge.ai · read 8 Oct 2026
