Warmbox
Email warm-up automation and inbox reputation monitoring for cold-email senders and small outbound teams.
About Warmbox
Warmbox is an email warm-up service for cold-email senders who want to build and monitor inbox reputation before raising campaign volume. It connects sender inboxes, runs automated email interactions, and can move messages out of spam. The dashboard reports on deliverability and reputation, while several warm-up options let teams control ongoing activity. Pricing scales by inbox capacity, daily email allowance, and team seats. Solo includes one inbox, 50 emails per day, and one member; Start-up includes three inboxes, 250 emails per day, and three members; Growth includes six inboxes, 500 emails per day, and six members. Solo and Start-up list premium support. Warmbox fits outbound teams prepared to add a warm-up and monitoring stage before campaigns. Capacity needs careful comparison: moving from Solo to Start-up raises the monthly charge from $15 to $69, and the largest listed tier stops at six inboxes and 500 emails per day.
Best for
Best use cases
Preparing a new inbox before launching outbound campaigns
Keeping automated warm-up running while monitoring reputation reports
Coordinating warm-up capacity across a small sales team
Compare before choosing
Solo is the lowest-cost tier but caps activity at one inbox and 50 emails per day
Start-up raises capacity to three inboxes and 250 emails per day for $69 monthly
Growth reaches six inboxes and 500 emails per day, with the highest listed monthly cost
Features
Warm a new outbound inbox
Run automated interactions before increasing cold-email volume, while monitoring deliverability reports.
Manage several sender inboxes
Warm multiple inboxes from one service and choose a tier based on inbox count and team size.
Track inbox reputation
Use dashboard analytics to follow reputation and deliverability changes during ongoing warm-up.
Pros
- Automated interactions reduce the manual work of warming an inbox.
- Dashboard reporting makes deliverability and reputation visible.
- Plan limits are stated by inboxes, daily emails, and members.
Cons
- Solo supports only one inbox and 50 emails per day.
- The monthly cost rises from $15 to $69 when moving to Start-up.
- The listed Growth limits may be too low for operations above six inboxes or 500 daily emails.
Pricing Plans
Solo
- 1 inbox warm-up
- 50 emails per day
- 1 member
- Premium support
Start-up
- 3 inbox warm-ups
- 250 emails per day
- 3 team members
- Premium support
Growth
- 6 inbox warm-ups
- 500 emails per day
- 6 team members
* Pricing information is for reference only. Please refer to the latest announcement on Warmbox's official website.