Warming up
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, warmup included on every mailbox, daily auth checks, 5-provider placement insight.
Dedicated warmup with a private peer network, priced per inbox.
| Warmerly | Warmbox | |
|---|---|---|
| Pricing model | Flat, mailboxes and warmup included | 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 charge until day 8 | Trial available (check warmbox.io) |
| Refund window | 30 days | Check their terms |
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.
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.
Warmerly is flat-rate — $19 for 5 mailboxes, $49 for 25 — so the price per mailbox falls as you add them. Warmbox charges per inbox, so its bill climbs with every one. At 10 mailboxes, Warmerly's $49 Growth plan sits against a Warmbox bill several times larger. Always verify Warmbox's current pricing at warmbox.io before comparing.
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.
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.
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.