What is Warmy? An email warm-up and deliverability service explained

What is Warmy? A warm-up and deliverability service

Warmy is a subscription service at warmy.io for people who send email from their own domains. Its main job is automated email warm-up: raising the number of messages a new mailbox sends step by step and generating opens, replies and spam rescues from other mailboxes, so that providers see engagement. Around that job it sells placement tests through a seed list, DMARC monitoring, email verification, a reputation tracker and Google Postmaster data, according to its pricing and product pages read on October 23, 2026.

The vendor presents the product as one platform for deliverability rather than a single feature.

How Warmy's warm-up works, step by step

• You connect a mailbox from Gmail, Google Workspace, Outlook, Microsoft 365, SMTP or another provider, according to the help center.
• Warmy sends and receives through your own mailbox. The help center says the messages are generated by Warmy but sent from your address to other users of the network.
• The network's mailboxes open the messages, reply, mark them important and move them out of spam. The FAQ says Warmy archives incoming warm-up messages after 20 minutes.
• Volume rises gradually on a schedule you can adjust, and the calculator page says its AI assistant changes the daily number as reputation grows.
• Placement tests use a seed list the vendor puts at more than 500,000 US mailboxes. You send your real campaign to it, and the vendor says those mailboxes open it, click and move it out of spam.

What else is in the service

• Authentication: DMARC monitoring that shows who sends as your domain and what fails, plus free SPF, DKIM and DMARC generators and checkers on the site.
• Reputation: domain and IP reputation tracking with alerts, and Google Postmaster data beside the warm-up results.
• Lists: email verification, described as part of every plan.
• AI and data: an assistant named Adeline, API access and integrations with sending platforms.
• People: a dedicated success manager, 24/7 human support and an offer of a free 30-minute deliverability review.

Where warm-up fits among the fixes for spam-folder email

Warm-up addresses one cause, a new sender with no history. Other causes sit outside it. Google requires all senders to authenticate with SPF or DKIM and to keep user-reported spam rates below 0.3%, and asks bulk senders for DMARC and one-click unsubscribe. Warmy's calculator page says warm-up cannot repair failing SPF, DKIM or DMARC or a provider block. So the order is authentication, then sending pace and list quality, then warm-up if you want help generating engagement.

The idea is also disputed. Mailgun argued on July 20, 2026 that automated warm-up networks produce engagement that does not reflect your real audience. The Google and Yahoo requirement pages read here describe a gradual volume increase without mentioning warm-up services.

Vendor figures to treat as claims

• Inbox placement: the warm-up product page headline cites 95%, and the deliverability product page cites a 98% average. The pages read here do not show how either was measured.
• Network size: over 1 million mailboxes on the pricing page, against a floor of 300,000 active mailboxes in the help center.
• Customer count: 7,000+ businesses on the pricing page and help center, 35,000+ on the home page.
• Next steps: the Warmy review covers features and terms, and the pricing guide explains how it bills.