Warmbox.ai ◆
Warmbox.ai automates email warm-up sequences to build sender reputation and improve cold email deliverability.
Free·from $15/mo
About Mailwarm
What is Mailwarm?
Mailwarm is an email warm-up tool that improves sender reputation and email deliverability by simulating natural email activity from a network of 50,000+ real inboxes. It helps sales teams, marketers, and agencies avoid the spam folder when sending cold campaigns or newsletters from new domains.
How does it work?
Mailwarm connects to Gmail, Outlook, Yahoo, Zoho, or custom SMTP accounts and automatically sends, opens, replies, and marks emails as important from aged real inboxes. Over 2–4 weeks, this raises your domain and IP reputation, reducing spam rates and boosting inbox placement. It also includes live inbox vs. spam placement tracking, bounce prevention, and provider-level warmup control.
Who is it for?
Best for sales teams running cold email outreach, marketers sending from new domains, and freelancers or agencies managing multiple mailboxes. Not for bulk transactional emailers or those who do not need to improve deliverability.
Real use cases
Teams like Luvi scaled outbound after improving deliverability with Mailwarm. Prime Match Recruiting saw a 31% increase in Microsoft inbox placement. Docsify.net grew open rates by over 30% in two months.
Key features
- Automatic warm-up — Sends and replies to emails daily from real inboxes to build sender reputation
- Multi-account support — Warm up unlimited email accounts simultaneously
- Custom scheduling — Set daily send limits and timing to mimic human behavior
- Reputation dashboard — Track sender score, spam rate, and inbox placement live
- Spam test — Check if your emails land in inbox or spam before campaigns
- Provider-level warmup control — Choose warmup providers: Gmail, Outlook, Microsoft 365, Yahoo, SMTP
- Bounce prevention — Invalid inboxes automatically deactivated to reduce bounce risk
