Warmforge

What Warmforge is

Warmforge is an email warm-up and deliverability tool for Google Workspace and Outlook mailboxes. It uses AI-written emails to imitate human mailbox activity and warms mailboxes automatically; the product recommends allowing at least two weeks before outreach. Health Checks review mailbox DNS and MX records and check blacklist status. Placement tests report delivery rates to different email service providers, and each Warmforge plan includes one free test per month. The product says it removes warm-up emails that land in spam. Its pool is described as curated, built from aged accounts, and dominated by Google Workspace and Microsoft 365 mailboxes. Users can explore features for free, but warming requires purchased mailbox slots; each slot covers one mailbox, and mailboxes beyond the purchased count are disabled for warm-up. The Email Warm Up plan is $10 a month, billed per month, billed quarterly, and includes one free slot. Placement Tests Pro is $39 a month; Placement Tests Growth is $169 a month. Warmforge also offers API access and a CLI for mailbox management, warm-up stats, and placement tests.

Who it suits

Warmforge suits teams using Google Workspace or Outlook mailboxes that want mailbox warm-up and deliverability monitoring. Salesforge users are eligible for unlimited Warmforge mailbox slots at no extra cost.

Limits

Free access lets users explore Warmforge features, but it does not provide a free trial of mailbox warming. Each mailbox needs a slot, and mailboxes beyond the purchased slot count are disabled for warm-up. The Email Warm Up plan costs $10 a month, billed per month, billed quarterly, and includes one free slot.

Getting started

1. Visit the Warmforge website.
2. Explore the features for free, or choose a paid plan for mailbox warming.
3. Purchase enough mailbox slots for the mailboxes you want to warm.
4. Connect a Google Workspace or Outlook mailbox.
5. Allow at least two weeks of warming before outreach, as Warmforge recommends.

Verdict

Warmforge combines automated warm-up with mailbox health checks and placement testing. Factor in the purchased slot requirement and the plan’s billing terms when deciding whether it fits.