Warmy.io

What it does

Warmy.io warms up domains and IPs so email lands in the inbox instead of spam. It does this inside a network of more than one million real mailboxes, and monitors deliverability, DNS authentication and domain reputation while it works. An AI co-pilot called Adeline watches sending activity and flags what to fix.

The platform also includes an email seed list, built-in email verification, DMARC monitoring and a Google Postmaster integration. The vendor lists a 500,000-plus US seed list that rotates monthly to keep the engagement signals fresh.

Why you would need it

The pain is that email that worked last month starts going to spam. You change nothing, open rates drop, replies stop and you cannot tell whether the cause is the domain, the list, the copy or the settings.

Warmy gives you something to look at. It shows where mail lands, how the domain reputation looks and whether authentication is set up correctly. For anyone about to send at volume from new domains, it also does the slow part of building trust before the real campaign starts.

Where it fits

Warmy sits before and beside your sending platform. It prepares the domain and mailboxes, then keeps checking them while the campaigns run. The vendor says it works with any email service provider and lists names such as HubSpot, ActiveCampaign, Brevo, Mailchimp and Customer.io.

It does not replace the outreach or newsletter tool. It protects the sender reputation that tool depends on.

What stands out

• Separate plans for corporate inboxes (Google Workspace and Microsoft 365) and consumer inboxes (Gmail, Yahoo, Outlook), so the sender is matched to the audience.
• Google Postmaster data brought into the same view as warm-up.
• DMARC monitoring and email verification included in the platform.
• A full API with automation support through tools such as n8n.

My take

I like that Warmy treats deliverability as a continuing job, not a one-off warm-up. If you send at volume, monitoring is as important as the warm-up itself. The split between B2B and B2C plans also helps, because the two audiences sit in different inboxes.

The cost is less predictable. Pricing follows the volume of warm-up email, and there is no flat figure on the site. Adeline and the deliverability workflow also take some setting up to get right.

Verdict

Pick it if you are about to send cold or marketing email at real volume and want warm-up, monitoring and authentication checks together. Skip it if you want a fixed price up front, or if you only need a basic warm-up for a couple of mailboxes.