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Warmup Inbox Review: A Low-Cost Way to Warm a Few Inboxes
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Blog > Catalog > Sequencers > Warmup Inbox
By Nikita Bykadarov, CEO of Maildoso · Updated June 12, 2026
Introduction
If you just want to test warmup on a couple of inboxes without committing much, price matters most. This article is an independent, deliverability-first review of Warmup Inbox, one of the cheapest entry points in the category.
It covers what Warmup Inbox does, its low per-inbox pricing, where it falls short, and how it compares to richer tools. It's most useful for solo senders and small teams warming a handful of mailboxes.
It covers what Warmup Inbox does, its low per-inbox pricing, where it falls short, and how it compares to richer tools. It's most useful for solo senders and small teams warming a handful of mailboxes.
Written by Nikita Bykadarov. Nikita founded and runs Maildoso, the cold email infrastructure platform behind 400,000+ mailboxes and more than 10M emails a day for over 6,000 companies. Years on the sending side let his team see which warmup methods build reputation and which trip filters – the lens behind these reviews.
Last updated: June 2026.
Last updated: June 2026.
How we review tools
We run every tool through the same lens. We look at public features and pricing, test them against what we know about deliverability, and cross-check the picture with aggregated G2 and Trustpilot ratings. Scores reflect value for the buyer a tool is built for, so we judge fit, not just features. We name weaknesses as directly as strengths, refresh reviews when pricing or features shift, and never take payment to change a score.
Warmup Inbox dashboard with warmup settings
Verdict box
- What it is: A low-cost, easy-to-use warmup tool on a 30,000+ inbox network.
- Best for: Solo senders and small teams testing warmup cheaply.
- Starting price: From $15/inbox/month (annual).
- Our rating: ⭐⭐⭐⭐
- Bottom line: A cheap, simple entry point for warming a few inboxes – fine for small scale, thin on advanced features.
Visit Warmup Inbox →
Ratings
G2: 4.6/5 (47 reviews)
Warmup Inbox holds a solid 4.6 on G2, with reviewers praising the quick setup and low cost. It has limited Trustpilot presence, so the G2 sample is the one to weigh.
Warmup Inbox holds a solid 4.6 on G2, with reviewers praising the quick setup and low cost. It has limited Trustpilot presence, so the G2 sample is the one to weigh.
Warmup Inbox in depth
Warmup Inbox was founded in 2020 by Mike Benson and is now part of Itrinity's SaaS portfolio. Its appeal is straightforward: a quick setup, a 30,000+ inbox warmup network, and one of the lowest entry prices in the category. For a solo sender or a small team that wants to warm a few mailboxes without overthinking it, it's an easy, cheap on-ramp, and the high G2 score reflects that satisfaction.
The trade-offs are depth and scale. It's a budget tool, lighter on advanced controls and monitoring than Mailreach or Warmy, and its per-inbox pricing climbs once you run many mailboxes – where flat-rate tools win. As with any warmup, it can't fix weak authentication or cold domains. For small-scale, low-cost warmup, though, it does exactly what it promises.
The trade-offs are depth and scale. It's a budget tool, lighter on advanced controls and monitoring than Mailreach or Warmy, and its per-inbox pricing climbs once you run many mailboxes – where flat-rate tools win. As with any warmup, it can't fix weak authentication or cold domains. For small-scale, low-cost warmup, though, it does exactly what it promises.
Pricing
Warmup Inbox prices per inbox.
- From $15/inbox/month (annual), around $19/month billed monthly.
- Pro – about $49/inbox/month (annual), ~$59 monthly, for more features.
Warmup Inbox Alternatives
See the full email warmup comparison for the wider field.
A note on deliverability
Warmup Inbox warms cheaply, but warmup can't fix the foundation – authentication and clean, dedicated domains set your ceiling, and many infrastructure providers already include warmup. Maildoso gives you dedicated, authenticated domains and mailboxes with warmup built in, so you may not need a separate tool. Through Maildoso's API and MCP server, you can automate provisioning and connect it to your tools and AI agents without manual setup.
Most cold emails fail simply because they land in spam. People never even see your offer. Our SMTP and Google Workspace mailboxes are built specifically for outbound; this means your emails will finally be seen, and you’ll start getting more positive replies.
Boost your outbound with our infrastructure!
FAQ
- Q:Is Warmup Inbox worth it?A:For solo senders and small teams that want cheap, simple warmup, yes. Teams at scale or wanting monitoring will outgrow it.
- Q:How much does Warmup Inbox cost?A:From $15/inbox/month on annual billing (around $19 monthly), with a Pro tier near $49/inbox/month for more features.
- Q:How does Warmup Inbox work?A:It connects your inbox and warms it using a 30,000+ inbox network, generating engagement to build sender reputation, with quick setup.
- Q:Warmup Inbox vs. Warmbox?A:Both are simple, low-cost per-inbox warmup tools. Warmup Inbox has the higher public G2 score; Warmbox highlights its large aged network. Either suits small-scale warmup.
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