Warmerly vs Warmbox
Warmbox is a warmup-only tool with a private warming network and a focus on inbox placement visibility. It supports Gmail, Outlook, and SMTP — but prices per inbox, which adds up fast once you scale beyond a handful of mailboxes.
The cheaper, specialised alternative. Warmup-only, unlimited mailboxes, daily auth checks, 5-provider placement insight.
Dedicated warmup with a private peer network, priced per inbox.
The short version
- Warmbox charges per inbox. Warmerly's flat $19/month covers unlimited mailboxes on every plan. At 5 mailboxes, Warmbox typically costs roughly 5–7× more.
- Both tools are warmup-only and work alongside your existing campaign sender. Neither replaces Apollo, lemlist, or Instantly.
- Warmerly runs spam-folder rescue every 10 minutes. Warmbox's rescue interval varies by plan — check their current documentation.
- Warmerly monitors SPF, DKIM, DMARC, and MTA-STS daily with remediation guidance. Warmbox surfaces auth status but with less depth.
- Warmbox supports SMTP connections in addition to Gmail and Outlook OAuth. Warmerly currently focuses on Gmail and Microsoft OAuth mailboxes.
Feature by feature
| Warmerly | Warmbox | |
|---|---|---|
| Pricing model | Flat, unlimited mailboxes | Per inbox |
| Starting price (per month) | $19 | ~$19–29 / inbox |
| 5 mailboxes monthly cost | $19 | ~$95–145 |
| 10 mailboxes monthly cost | $19 | ~$190–290 |
| Spam-folder rescue | Every 10 minutes | Available (check plan) |
| Reply with quoted history | Yes | Yes |
| Inbox placement seeds | 5 providers | Yes (check current coverage) |
| Auth monitoring (SPF/DKIM/DMARC) | Daily, with remediation copy | Status indicator |
| Reputation drop alerts | Email + webhook + Slack | |
| SMTP mailbox support | Gmail & Microsoft OAuth | Gmail, Outlook, SMTP |
| API access | Agency plan | Check current docs |
| USD/GBP billing & EU data residency | Yes | No |
| Free trial | 7 days, no card | Trial available (check warmbox.io) |
| Refund window | 30 days | Check their terms |
Our verdict
Warmbox is a capable warmup tool with solid fundamentals. If you need to warm SMTP mailboxes (non-Google, non-Microsoft), it is one of the few tools that supports that. For Gmail and Outlook users managing more than 2 or 3 mailboxes, Warmerly's flat rate is dramatically cheaper — and the daily auth monitoring adds meaningful protection that per-inbox tools rarely prioritise.
- You manage 3 or more Gmail or Microsoft mailboxes (flat rate wins fast)
- You want daily SPF, DKIM, DMARC checks with step-by-step remediation guidance
- You want USD or GBP billing, or need EU data residency
- You want webhook and Slack alerts, not just email notifications
- You need to warm SMTP mailboxes outside Gmail and Microsoft
- You have 1–2 mailboxes and strongly prefer their specific UI or peer network
- You want warmup and inbox placement testing tightly coupled in one Warmbox dashboard
Questions
Is Warmerly a direct replacement for Warmbox?
For Gmail and Microsoft mailboxes, yes. Both connect via OAuth and run active warmup sequences with peer replies, spam recovery, and positive engagement signals. If you rely on Warmbox for SMTP warmup, Warmerly does not currently support that — you would need to stick with Warmbox or a similar tool for those accounts.
How does pricing compare once I scale past 5 mailboxes?
Warmerly is flat-rate at $19/month regardless of mailbox count. Warmbox charges per inbox, so the gap widens every time you add a mailbox. At 10 mailboxes on a mid-tier Warmbox plan, you are typically spending 10–15× what Warmerly costs. Always verify Warmbox's current pricing at warmbox.io before comparing.
Will switching from Warmbox to Warmerly reset my domain reputation?
No. Mailbox reputation is held by Gmail and Microsoft, not by your warmup tool. Switching tools does not affect it. Warmerly will pick up where Warmbox left off. Connect your mailbox via OAuth, choose a ramp schedule, and the warmup continues seamlessly.
How long does it take to switch from Warmbox to Warmerly?
About 2 minutes per mailbox. Disconnect from Warmbox, connect to Warmerly via the Google or Microsoft OAuth flow, select a ramp curve, and you are live. No DNS changes required.
Tired of paying Warmbox prices?
Connect a mailbox to Warmerly in 60 seconds. 7-day free trial, card required, first charge on day 8. We will warm right alongside whatever you use now, so you can A/B without commitment.