Warmup Inbox has positioned itself as the budget-friendly option in a market where competitors charge $50+ per month for similar functionality.
If you’ve been burned by spam folder placement and want to test whether warmup actually works — without betting your entire marketing budget — the price point is genuinely attractive.
But affordable doesn’t always mean safe. The tool’s aggressive sending patterns have created real problems for users warming new domains, and the lack of diagnostic depth leaves you guessing when things go wrong.
As an email deliverability consultant who has helped hundreds of businesses escape the spam folder, I’ve tested Warmup Inbox across multiple domains (and watched clients struggle with its limitations) to prepare this honest review covering:
- Real pricing breakdown across all three tiers
- Account suspension risks and how to avoid them
- What the dashboard actually tells you (and what it doesn’t)
- Who benefits most — and who should stay away
- Better alternatives for different use cases
Let’s examine whether Warmup Inbox deserves a spot in your deliverability stack — or whether the low price comes with hidden costs.
TLDR: Warmup Inbox at a glance
A quick summary of our Warmup Inbox review:
| Aspect | Verdict |
| Best for | Freelancers warming 1–2 established inboxes on a budget |
| Pricing | $15–19/mo (Basic) — genuinely affordable for a single inbox |
| Standout feature | 30,000+ real inbox network with automatic spam rescue |
| Biggest weakness | Aggressive defaults cause account suspensions on new domains |
| Top alternative | EmailWarmup.com (personalized warmup, better diagnostics) |
| Our rating | 3/5 |
Is Warmup Inbox actually affordable?
The short answer: yes, for a single inbox. The longer answer involves understanding how per-inbox pricing compounds as you scale — and what features get locked behind higher tiers.
Pricing tiers
Warmup Inbox structures its plans around daily warmup volume, with costs varying by billing cycle.
| Plan | Monthly | Half-yearly | Annual | Warmup emails/day |
| Basic | $19 | $17 | $15 | 75 |
| Pro | $59 | $53 | $49 | 250 |
| Max | $99 | $89 | $79 | 1,000 |
The annual commitment gets you the best rate, but that’s $180 upfront for Basic or $948 for Max — a significant bet on a tool you haven’t fully tested.
Plan breakdown
Understanding what each tier actually includes matters before you commit.
The Basic plan ($15–19/mo)
The Basic plan covers 75 warmup emails per day, access to the 30,000+ inbox network, basic activity reports and spam checks, plus AI-generated content and templates.
For solo founders just testing whether warmup works, Basic provides enough functionality to evaluate results.
The Pro plan ($49–59/mo)
The Pro plan bumps volume to 250 warmup emails per day and adds scheduled warmup (control when emails are sent), language-specific warmup across 5 languages, topic and template customization, and reply rates up to 45%.
The scheduling feature alone justifies the upgrade for users who need warmup activity to mirror their actual sending patterns.
The Max plan ($79–99/mo)
The Max plan unlocks 1,000 warmup emails per day, technical setup checks (SPF, DKIM, DMARC verification), API access, reply rates up to 65%, and premium support.
The authentication verification is genuinely valuable — but locking it behind the most expensive tier means users who most need that guidance can’t access it.
The scaling problem
Per-inbox pricing compounds quickly once you move beyond a single mailbox.
| Inboxes | Warmup Inbox (Basic) | Warmup Inbox (Max) | EmailWarmup.com | TrulyInbox |
| 1 | $15/mo | $79/mo | $29/mo | $29/mo |
| 5 | $75/mo | $395/mo | $145/mo | $29/mo (flat) |
| 10 | $150/mo | $790/mo | $290/mo | $29/mo (flat) |
| 20 | $300/mo | $1,580/mo | Custom | $29/mo (flat) |
A colleague running a small sales team with 10 inboxes did the math and switched to a flat-rate alternative within two months. The per-inbox model simply doesn’t work at scale.
Feature comparison
To put Warmup Inbox in context against alternatives at the $29–49 price range.
| Feature | Warmup Inbox (Basic) | Warmup Inbox (Pro) | EmailWarmup.com | Warmy.io (Starter) |
| Starting price | $15/mo | $49/mo | $29/mo | $49/mo |
| Warmup emails/day | 75 | 250 | Custom | 100 |
| Network size | 30,000+ | 30,000+ | 50+ providers, 30,000+ | 20,000+ |
| Blacklist monitoring | Basic | Basic | ✓ | ✓ |
| DNS verification | ✗ | ✗ | ✓ | ✓ |
| Inbox health score | ✗ | ✗ | ✓ | ✓ |
| Personalized warmup | ✗ | ✗ | ✓ | Limited |
| Scheduling | ✗ | ✓ | ✓ | ✓ |
Hidden costs
The Basic plan looks attractive until you realize what’s missing.
Scheduling, language options, and technical verification are all locked behind more expensive tiers.
If you need features beyond basic warmup, you’re looking at $49–99/month — at which point competitors with better diagnostics become more compelling.
The 7-day free trial (no credit card required) is genuinely appreciated and lets you evaluate whether the tool works for your specific setup before committing money.
Value judgment
For a single established Gmail inbox, $15/month is hard to beat.
I’ve recommended Warmup Inbox to friends in exactly that situation — testing whether warmup helps, limited budget, not ready to invest in premium tools.
- But if you’re warming a new domain?
- If you need actual insight into deliverability problems?
- If you’re scaling beyond 2–3 inboxes?
The savings don’t justify the risks and limitations.
What are Warmup Inbox’s pros and cons?
After testing Warmup Inbox across multiple domains (and surveying user experiences on Trustpilot, G2, Capterra, and Reddit), here’s what actually holds up — and what falls short.
Who should (and shouldn’t) use Warmup Inbox?
Not every tool fits every situation, and Warmup Inbox’s strengths align with a very specific user profile.
Recommended if
- You value simplicity over deep analytics
- Your domain is at least 3–6 months old with some sending history
- You’re a freelancer or startup warming 1–2 established Gmail inboxes
- You want to test whether warmup helps before investing in premium tools
- Budget is your primary constraint, and you need the cheapest viable option
Not recommended if
- You’re warming a brand-new domain (suspension risk is real and documented)
- You’re scaling beyond 2–3 inboxes (per-inbox pricing breaks down quickly)
- You need actual visibility into deliverability problems beyond basic stats
- You can’t afford the business impact of a potential account suspension
- Microsoft 365 or Outlook is your primary sending environment
How does Warmup Inbox score across key categories?
Breaking down performance category by category reveals where Warmup Inbox genuinely excels — and where alternatives consistently outperform it.
| Category | Rating | Notes |
| Ease of setup | 4.5/5 | Under 10 minutes with an intuitive dashboard — genuinely beginner-friendly |
| Warmup effectiveness | 3/5 | Real inbox network works, but aggressive defaults create suspension risks |
| Reputation monitoring | 2/5 | No inbox health score or proactive alerts — significant gap |
| Reporting quality | 2.5/5 | Basic stats only; lacks the diagnostic power users need |
| Provider compatibility | 3/5 | Gmail reliable, Outlook inconsistent, SMTP limited |
| Customer support | 4/5 | Responsive and helpful — one of Warmup Inbox’s genuine strengths |
| Value for money | 3.5/5 | Excellent at $15 for one inbox; economics break down at scale |
| Scalability | 2/5 | Per-inbox pricing punishes growth. |
How does Warmup Inbox actually perform?
Let’s examine the platform’s core capabilities in practice — what works, what struggles, and what user feedback reveals.
Network quality
Warmup Inbox’s 30,000+ inbox network is its primary selling point, and on this front, the tool delivers.
The network uses real, active email accounts (not bot-generated addresses) that perform authentic engagement actions: opening emails, marking them as important, removing them from spam, and generating replies.
The spam rescue feature deserves specific mention.
When your email lands in spam on a network inbox, the system automatically moves it back to the primary inbox and marks it as important.
For ESPs like Gmail, those positive signals contribute meaningfully to sender reputation over time.
Warmup algorithm
The tool’s warmup approach is straightforward:
- Send emails to the network
- Receive engagement
- Build reputation.
The daily volume varies by plan (75 for Basic, 250 for Pro, 1,000 for Max), and Pro/Max users can schedule when warmup emails are sent.
Now, multiple users across review platforms report that Warmup Inbox’s default settings are too aggressive for new domains. The tool starts at volumes that trigger suspicion with Google Workspace and Outlook, leading to account suspensions — sometimes permanent.
A Trustpilot reviewer described the experience bluntly: their Google Workspace account was “permanently suspended” after using Warmup Inbox on a new domain. Another noted being “flagged by Google” despite following the tool’s recommended settings.
For established domains with sending history, the aggressive approach may be fine.
For anything under 3–6 months old, I’d strongly recommend starting at much lower volumes than the defaults suggest — or using alternatives with gentler ramp-up curves.
Authentication checks
Proper email authentication is foundational to deliverability.
Warmup Inbox can verify your SPF, DKIM, and DMARC configuration — but only on the Max plan ($79–99/month).
The feature gating here is frustrating.
Users who most need authentication guidance (beginners) are the least likely to pay $79+/month. By the time you’re at that price point, competitors with built-in DNS management become more compelling.
Dashboard and reporting
The Warmup Inbox dashboard is clean and beginner-friendly.
You can see warmup activity over time, spam/inbox placement distribution, and basic engagement metrics (opens, replies).
What’s missing is meaningful diagnostic depth.
There’s no inbox health score (unlike tools like Warmy.io or EmailWarmup.com).
No real-time alerts when deliverability drops. No detailed analysis of why emails might be landing in spam. If something goes wrong, you’re essentially guessing at the cause.
For users who just want confirmation that warmup is happening, the dashboard suffices. For anyone who needs to troubleshoot problems or optimize results, the reporting feels incomplete.
Provider compatibility
Gmail and Google Workspace integration works reliably in my testing and across user reports. The OAuth connection is straightforward, and warmup results are consistent.
Outlook and Microsoft 365 performance are less reliable.
Multiple users report inconsistent results — some see improvement, others see minimal change. Microsoft’s filters seem particularly adept at identifying warmup network patterns, which may explain the mixed outcomes.
Custom SMTP integration exists but receives limited attention. Users warming custom SMTP accounts report the most inconsistent results.
If Gmail is your primary inbox, Warmup Inbox performs well. If you’re heavily invested in Microsoft’s ecosystem, temper your expectations.
Scheduling
Pro and Max users can schedule when warmup emails are sent — a meaningful feature for mimicking natural sending patterns.
If your real campaigns go out in morning hours, having a warmup activity concentrated there makes the pattern look more authentic.
Basic users don’t get this option, which limits their ability to create natural-looking sending behavior.
Customer support
Credit where due — Warmup Inbox’s support team receives consistently positive reviews.
Support representatives Lucia and Camilo are mentioned by name across Trustpilot and G2 reviews as responsive and genuinely helpful.
For a tool at this price point, quality human support is notable. Many competitors either rely entirely on chatbots or take days to respond. Warmup Inbox’s support is a legitimate strength.
The suspension problem
I need to address this directly because it’s the most serious concern across user reviews.
Multiple users on Trustpilot, G2, and Reddit report that Warmup Inbox’s aggressive defaults caused their Google Workspace or Outlook accounts to be suspended — sometimes permanently.
The pattern is consistent:
- User connects new domain
- Uses recommended settings
- ESP flags the activity as suspicious
- Account gets locked
One Trustpilot reviewer:
“My Google Workspace account was permanently suspended after using this tool.”
Another:
“Was flagged by Google within 2 weeks of using the service.”
A Reddit user noted:
“Started with 10 emails/day and slowly increased to 30 over a few weeks” as a safer approach than the tool’s defaults.
The lesson is clear — if you’re warming a new domain (under 3–6 months old), either start at much lower volumes than Warmup Inbox suggests, or consider alternatives with gentler ramp-up approaches. The $14/month savings aren’t worth risking your email account.
What about email warmup effectiveness?
There’s ongoing debate in the cold email community about whether automated warmup actually works — or whether ESPs like Gmail and Microsoft have become sophisticated enough to detect warmup network patterns.
The argument is straightforward — if thousands of users are all sending warmup emails to the same network of inboxes, ESPs can identify that pattern and potentially flag it as artificial engagement.
My take is that automated warmup still provides value, but it’s not magic. The fundamentals matter more…proper DNS authentication, quality content that avoids spam triggers, gradual volume increases, and real engagement from actual recipients.
Warmup supplements these fundamentals — it doesn’t replace them.
Is Warmup Inbox the right choice for you?
After extensive testing, client feedback, and surveying dozens of user reviews, my verdict is 3/5 — a genuinely affordable tool with meaningful limitations.
The strengths are real
The $15/month entry point is hard to beat.
The 30,000+ inbox network uses real accounts that provide authentic engagement signals. Setup is genuinely simple. Customer support is responsive and helpful — a rarity at this price point.
The weaknesses are equally real
Aggressive warmup defaults create genuine suspension risks for new domains.
The lack of diagnostics leaves you guessing when things go wrong. Per-inbox pricing breaks down at scale. Technical verification sits behind an expensive paywall.
So what should you do?
Solo founders and freelancers warming 1–2 established inboxes who prioritize budget above all else should still consider Warmup Inbox.
If you’re testing whether warmup works for your situation before investing more, the 7-day free trial (no credit card) makes it genuinely low-risk to try.
Anyone warming a new domain should look elsewhere — the suspension risk isn’t worth saving $14/month. Agencies and teams scaling beyond 2–3 inboxes need better economics. Users who need actual visibility into deliverability problems need better diagnostics.
Ready for warmup that protects your sender reputation?
If Warmup Inbox’s suspension stories made you nervous — or you need actual visibility into what’s happening with your deliverability — EmailWarmup.com offers a fundamentally different approach:
AI-guided warmups mirror your real campaigns — curated by expert copywriters to raise inbox rates.
See inbox vs spam in Gmail/Outlook with our free extension and sent-folder labels for each email.
Run unlimited tests across 50+ mailbox providers with clear inbox, promotions, and spam breakdowns.
Free 1:1 experts who fix SPF/DKIM/DMARC, blacklist issues, segmentation without any limits, or upsells.
Strategy, audits, and campaign optimization to grow opens, clicks, and revenue end-to-end.
Verify the email addresses in your lists with fast and accurate checks, using REST/JSON, SDKs in 8 languages, and 100 free credits for testing.
EmailWarmup.com offers AI-driven warmup matching your actual campaign style, a 98% inbox placement rate with a full money-back guarantee, free unlimited deliverability testing (no credit limits), built-in DNS verification and Google Postmaster integration, and 24/7 human support from deliverability specialists.
Whether you’re starting fresh or recovering from a suspension, a personalized warmup makes the difference between landing in the inbox and landing in spam.
Frequently asked questions
Here are some commonly asked questions about Warmup Inbox:
Risky. Multiple users report that Warmup Inbox’s aggressive warmup defaults have caused permanent account suspensions on Google Workspace and Outlook for new domains. If you’re warming a fresh domain (under 3 months old), either use much lower volumes than the tool’s defaults or consider alternatives with gentler ramp-up approaches.
Gmail results are reliable and consistent based on user reports and my testing. Outlook performance is mixed — some users see improvement, while others report minimal change or continued spam folder placement. If Microsoft 365 is your primary environment, consider alternatives with better Outlook track records.
Most users report seeing improvement within 2–4 weeks. A Trustpilot reviewer mentioned getting their domain “warm” and emails “inboxing well after 3–4 weeks.” However, some users report emails still landing in spam after longer periods, suggesting results vary significantly based on your specific domain history and configuration.
Warmup Inbox uses generic engagement patterns across a shared network, while EmailWarmup.com uses AI to personalize warmup, matching your actual campaigns. EmailWarmup.com includes built-in DNS verification and detailed diagnostics at the base price; Warmup Inbox locks technical checks behind its $79–99/month Max plan.
Yes — multiple users across Trustpilot, G2, and Reddit report suspensions caused by aggressive sending patterns, particularly on Google Workspace and Outlook accounts. New domains are most vulnerable. If suspension would significantly impact your business, the risk may outweigh the cost savings.
Yes — 7 days with no credit card required. The trial runs on Basic plan features, so you won’t experience Pro or Max capabilities without paying. Still, it’s enough time to test whether the tool connects properly and starts generating activity for your specific setup.
Warmup Inbox offers fewer advanced features at the Basic tier — no scheduling, no language options, no deep technical verification. The simpler AI content generation and more basic reporting keep costs down. Whether the savings justify the limitations depends on your specific needs.
Not ideal. Per-inbox pricing makes costs prohibitive at scale — managing 10 client inboxes runs $150–790/month depending on plan tier. Alternatives like TrulyInbox offer flat-rate pricing that makes much more sense for agencies. The lack of bulk management features also becomes frustrating when handling many accounts.
Several factors contribute: aggressive warmup patterns that ESPs can detect, lack of proper DNS authentication (which Basic/Pro plans don’t verify), content issues with actual campaigns, or domain reputation problems that warmup alone can’t fix. Warmup supplements deliverability fundamentals — it doesn’t replace them.
