Warmup Inbox Review 2026: Best Budget Option?
At $15/month per inbox, Warmup Inbox is one of the cheapest email warmup tools available. But does cheap mean good enough? We tested it to find out.
The best budget pick — it works, but tops out at 90% inbox placement with no authentication monitoring. MailPilot hits 99.2% placement and, thanks to flat per-plan pricing (free plan, then from $9/mo for 10 mailboxes), is often cheaper once you warm up several inboxes. Try MailPilot free.
MailPilot - 99.2% Inbox Placement
The top-rated email warmup tool with 8,400+ real mailboxes, Gmail & Outlook OAuth, SPF/DKIM/DMARC monitoring, and the highest inbox placement rate we tested. Trusted by 340+ companies.
What is Warmup Inbox?
Warmup Inbox is a budget-focused email warmup tool. At $15/month per inbox, it targets solo senders, small teams, and agencies warming up many accounts on a tight per-mailbox budget. Setup takes about 5 minutes per mailbox, then it sends warmup emails through its 6,000+ account network.
Testing Results
Our testing over 21 days showed Warmup Inbox achieving 90% inbox placement - which is functional but measurably lower than the 99.2% we measured with MailPilot and 95% with Warmy.io.
The warmup volume ramp-up was adequate: starting at 15 emails/day and reaching 80 emails/day by day 21. This is slightly below MailPilot's more aggressive (but still safe) ramp-up schedule.
What You Don't Get
- No SPF/DKIM/DMARC monitoring (must use separate tools)
- Basic reporting - no inbox placement breakdown by provider
- No adaptive scheduling based on domain health signals
- Shorter free trial (3 days vs MailPilot's 14 days)
Who Should Use Warmup Inbox?
- Agencies warming up 10+ mailboxes and price per mailbox is the primary constraint
- Senders who need warmup but are just starting and can't justify premium prices
- Situations where 90% inbox placement is acceptable (lower-stakes campaigns)
Our Verdict
Warmup Inbox earns its rating as the best budget warmup option. It works, it's reliable, and at $15/month it's accessible. The trade-off is a 9-point gap in inbox placement versus MailPilot - which matters if you're serious about cold email. For budget-first buyers, it's the right choice. For performance-first buyers, upgrade to MailPilot.
MailPilot vs Warmup Inbox
Full feature and price comparison between these two tools.
See Full ComparisonTry MailPilot Instead
99.2% inbox placement vs 90%. Free plan, paid from $9/mo, 14-day free trial - see the difference yourself.
Related guides
Warmup Inbox FAQ
At $15/month per inbox, Warmup Inbox is one of the most affordable reputable email warmup tools. TrulyInbox ($17/mo) and Lemwarm's restricted free tier are similar in price. MailPilot has a free plan and paid plans from $9/mo (10 mailboxes) and delivers significantly better inbox placement.
No Credit Card Required
Cheap Warmup That Actually Lands
MailPilot: 99.2% inbox placement plus SPF/DKIM/DMARC monitoring. Flat plans from $9/mo (free plan available), 14-day free trial.
8,400+ real mailboxes · 99.2% inbox placement · 340+ companies trust it