Warmbox.ai

Email Marketing Free trial · from $29/mo

About Warmbox.ai

Cold emails hitting spam? Warmbox.ai runs automated warm-up campaigns that send and reply to emails from your address, building sender reputation with mailbox providers like Gmail and Outlook.

What it does

It connects your email account, then simulates natural email activity—sending, opening, replying—to signal to algorithms that you're a legitimate sender. The result: higher deliverability for outreach campaigns.

Best for

Sales teams sending cold emails at scale
Marketers running email outreach sequences
Founders warming up new domains before campaigns

Strengths

Automated warm-up with customizable intensity levels
Supports multiple email providers (Gmail, Outlook, custom SMTP)
Real-time deliverability monitoring and spam score tracking

Key features

Automated Warm-Up — Sends and replies to emails from your address to build reputation
Multi-Provider Support — Works with Gmail, Outlook, and custom SMTP servers
Deliverability Dashboard — Shows inbox placement rate, spam score, and bounce rate
Customizable Schedules — Set daily send limits and warm-up duration
Campaign Integration — Connects with tools like Mailchimp and HubSpot

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