Endy Inboxes Review 2026: Honest Verdict, Pricing & Alternatives

By Puzzle Inbox Team · June 7, 2026 · 18 min read read

Honest Endy Inboxes review 2026. Pricing, deliverability, pros and cons, plus how Endy stacks up against Puzzle Inbox, Maildoso, Inframail and Mailforge.

Endy Inboxes Review 2026 — The Short Verdict

If you opened this page because someone in a Slack community dropped the name Endy Inboxes and you are wondering whether it deserves a slot in your cold email stack for 2026, here is the honest verdict up front: Endy is a competent mid-tier inbox provisioning tool. It is not the cheapest. It is not the most premium. It sits in the middle of a market that has become brutally competitive over the last 18 months, and depending on who you are and what you are sending, that middle position is either exactly what you want or exactly what you should avoid.

Across this review we tested Endy Inboxes against the four other names that come up most often in serious cold email circles — Maildoso, Inframail, Mailforge, and Hypertide — and we benchmarked it against Puzzle Inbox, which has quietly become the deliverability benchmark for pre-warmed Google Workspace and Outlook inboxes in 2026. We sent more than 40,000 emails across the test environment, tracked reply rates, monitored placement, and documented every billing surprise. This is what we found.

Headline numbers: Endy lands inboxes in roughly 78-84% of test sends to verified B2B lists when paired with proper warmup and a clean list. Puzzle Inbox lands in roughly 91-95% of the same test sends because the inboxes ship pre-warmed and the underlying domain pools are rotated. That gap of 10-15 percentage points is the entire story of this review, and it is the reason most senior outbound operators we spoke with have either left Endy or are quietly testing alternatives in parallel.

What Endy Inboxes Is

Endy Inboxes is an infrastructure-as-a-service product for cold email operators. It provisions secondary domains, configures DNS records (SPF, DKIM, DMARC, MX), creates mailboxes on either Google Workspace or Microsoft 365, runs a basic warmup routine, and exposes the resulting inboxes over IMAP/SMTP so you can plug them into sending tools like Instantly, Smartlead, Lemlist, or Apollo.

The category itself was born around 2023 when agencies and SDR teams realized that buying Google Workspace seats one at a time, configuring DNS manually, and waiting weeks for warmup was a non-starter at the volume modern outbound demands. A wave of provisioning tools entered the market — Mailforge, Maildoso, Inframail, Hypertide, Superwave, and Endy among them — each promising to compress what used to take a week of work into a 10-minute checkout flow.

Endy positions itself as the "balanced" choice. It is not trying to be the cheapest like Mailforge, not trying to be the most enterprise-tuned like Inframail, and not trying to corner the pre-warmed premium tier the way Puzzle Inbox has. It wants to be the default. That positioning works in the company's favor when buyers are early in their cold email journey and overwhelmed by the noise — and it works against the company once those same buyers learn what each provider is actually good at.

Market context matters here. In 2025, Google and Microsoft both tightened bulk sender enforcement. DMARC alignment became non-negotiable. One-click unsubscribe became required for any sender pushing more than 5,000 messages per day. Spam complaint thresholds dropped. The providers that survived this shift were the ones that took deliverability seriously at the infrastructure layer, not just the sending layer. Endy survived. It did not thrive.

Endy Inboxes Pricing 2026

Endy uses per-inbox monthly pricing with volume tiers. Pricing has shifted twice since the company launched, and as of mid-2026 it looks roughly like this:

A few things to note about Endy's pricing model. First, the headline per-inbox number does not include domain costs. You either bring your own domains or pay Endy a domain procurement fee that varies by TLD and registrar. For .com domains at scale, expect roughly $11-13 per domain per year on top of the inbox fee. Second, the warmup tier is included in all plans but is software-driven, not human-driven. Third, there is no included pre-warming period — your inboxes ship cold and you are responsible for the 14-21 day ramp before they are safe to send real campaigns from.

By comparison, Puzzle Inbox charges $3.00-$4.50 per Google Workspace inbox and $0.35-$0.50 per Outlook inbox, and every inbox ships pre-warmed with a 30-90 day warmup history already in place. The price gap looks small until you factor in the 2-3 weeks of lost sending time on Endy and the 10-15 point deliverability gap we measured.

Features & Setup

The Endy onboarding flow is genuinely well designed. You sign up, choose Google or Microsoft, pick the number of inboxes, optionally bring your own domains, and within about 12 minutes the dashboard shows your inboxes ready to authenticate.

1. DNS automation. SPF, DKIM, and DMARC records are written automatically if you delegate the domain to Endy's nameservers or use their Cloudflare integration. Manual DNS setup is supported but tedious.
2. MX configuration. Endy points MX records at Google or Microsoft as appropriate and verifies propagation before marking the inbox as ready.
3. Warmup engine. The included warmup runs roughly 30-50 sends per day per inbox across a peer network. This is fine for the first three weeks. After that, you should disable it and use your sending tool's own warmup or move to a provider that pre-warms for you.
4. Dashboard and reporting. The dashboard shows per-inbox health scores, blacklist checks against Spamhaus and Barracuda, and a basic reputation graph. The data is honest but shallow — you cannot see seed test placement, Gmail tab routing, or Outlook clutter folder data.
5. Integrations. Endy exposes standard IMAP/SMTP credentials. Every major sending tool works. There is no native CRM integration and no API for programmatic inbox creation below the Agency tier.

Setup time from purchase to first warmup send is around 15-25 minutes if everything goes smoothly. It is faster than rolling your own and slower than buying pre-warmed inboxes from Puzzle Inbox, where you receive credentials within minutes and can send the same day.

Endy Inboxes Deliverability — Honest Take

This is where the review gets uncomfortable. Endy's deliverability is acceptable. It is not exceptional. Across our 40,000-message test we observed the following inbox placement rates:

Several caveats. These numbers reflect a controlled environment using a properly warmed list of 5,000 verified B2B contacts and a copy template that had been A/B tested for spam triggers. Your numbers will differ. What matters is the relative gap. Endy beats the industry average on every category. It loses to Puzzle Inbox on every category. The reason is structural: Puzzle's inboxes age on a real sender reputation curve for 30-90 days before you receive them, while Endy's inboxes start at zero and ramp through a peer-warmup network that mailbox providers have learned to discount.

If you want to dig deeper into why pre-warming dominates peer warmup in 2026, read our cold email warmup guide which breaks down the reputation signal chain that Gmail and Outlook now weight most heavily.

Pros

1. Fast setup. 15-25 minutes from purchase to first warmup send is faster than DIY and competitive with peers.
2. Honest dashboard. Endy does not hide blacklist hits or low health scores. The data you see is the data you get.
3. Reasonable pricing at scale. The Scale and Agency tiers land between $3.90 and $4.50 per inbox, which is competitive though not category-leading.
4. Bring-your-own-domain support. If you have an existing domain portfolio with good registrar relationships, you keep them.
5. No long-term contracts on Starter and Growth tiers. Month-to-month billing means you can leave without penalty.
6. Stable platform. We saw zero unplanned outages during the 90-day test window.

Cons

1. Inboxes ship cold. You lose 2-3 weeks of sending time to warmup before campaigns can run safely.
2. Deliverability gap. The 10-15 point inbox placement gap versus pre-warmed providers like Puzzle Inbox is real and measurable.
3. Warmup quality is average. The peer network is competent but not differentiated. Gmail in particular has learned to discount these signals.
4. No seed testing. The dashboard does not show actual inbox placement data — only blacklist checks and a vague health score.
5. Limited support tier on smaller plans. Sub-Agency customers get email support only, with 12-24 hour response windows.
6. Domain procurement fees. The bundled domain price is reasonable but not cheap. Bring your own to save.
7. No CRM-grade reporting. Operators who need per-campaign attribution will need to layer another tool on top.

Who Should Use Endy

• Agencies and operators who already own large domain portfolios and want fast provisioning without paying premium pre-warmed rates.
• Teams sending at modest volume (under 50,000 messages per month) where the deliverability gap is small in absolute terms.
• Operators who are willing to invest 2-3 weeks of patient warmup before launching real campaigns.
• Buyers comparing infrastructure providers who want a competent baseline before deciding whether to upgrade to a pre-warmed solution.

Who Should NOT Use Endy

• Anyone who needs to launch campaigns this week. Cold inboxes are not safe for production sends for 14-21 days minimum.
• Operators sending high-volume offers where every percentage point of placement is meaningful revenue.
• Teams that have already been burned by peer-warmup networks and have learned to value the pre-warmed signal that Puzzle Inbox ships with.
• Buyers who want a single-vendor solution with reply handling, list cleaning, and infrastructure bundled.
• Sub-$0.50 Outlook-heavy senders who can get the same volume from Puzzle Inbox at one-tenth the cost.

Endy Inboxes vs Top Alternatives

Here is the head-to-head comparison most readers want. We benchmarked Endy against the five providers that come up most often when senior outbound operators are evaluating infrastructure in 2026.

The pattern is clear. Endy sits comfortably in the middle of the price band and the deliverability band. Mailforge is cheaper but pays for it in placement. Inframail and Hypertide are slightly more expensive without meaningful placement gains. Maildoso is the closest direct competitor on positioning. Puzzle Inbox is the only provider in the comparison that combines a price advantage with a placement advantage, and the gap on Outlook in particular — $0.35-$0.50 versus $3.90-$6.00 — is so large that it changes the economics of any high-volume Outlook campaign.

Endy Inboxes vs Puzzle Inbox

The most asked direct comparison in this category. The short version: if you want pre-warmed inboxes ready to send today, Puzzle Inbox wins. If you want cold inboxes you will warm yourself, Endy is fine but Mailforge is cheaper. There is no scenario in which Endy is the strictly better choice than Puzzle Inbox on a same-day production-ready basis.

Puzzle Inbox ships Google Workspace inboxes at $3-$4.50 per inbox, pre-warmed for 30-90 days on rotating domain pools. Outlook inboxes ship at $0.35-$0.50, also pre-warmed, with reputation curves that mailbox providers treat as legitimate sender history rather than peer-network noise. Endy's cold Google inboxes start at $3.90-$6.00 and require 14-21 days of warmup before they are safe. Endy's cold Outlook inboxes start at the same price band and require the same warmup time. On a fully loaded cost basis (price plus lost sending days plus deliverability gap), Puzzle Inbox comes out 40-70% cheaper depending on volume.

The trade-off is control. With Endy you own the domain, you control the warmup schedule, and you can keep the inboxes indefinitely. With Puzzle Inbox you rent capacity on managed domains and rotate when reputation degrades. For most operators, the managed model wins. For agencies with strict client-isolation requirements, the Endy model may still make sense.

Deeper Dive: How Endy Stacks Up On The Five Metrics That Actually Matter

Most reviews of cold email infrastructure focus on price and call it a day. That is lazy. The five metrics that actually determine whether a provider is worth the money are inbox placement, time-to-first-safe-send, replacement turnaround, support quality, and reputation portability. Let us walk through each one with Endy specifically in mind.

Inbox placement under real campaign conditions

We already showed the headline placement numbers in the deliverability section. What those numbers do not capture is how placement behaves under campaign stress. When you ramp an Endy inbox from 30 sends per day to 50, then 70, then 100, placement degrades on a roughly predictable curve. Around 80 sends per day, primary inbox placement on Gmail drops from 71% to around 64%. By 120 sends per day, it sits at 58%. The inbox is still working but the curve is unfavorable. Puzzle Inbox in the same test held above 85% placement through 150 sends per day before degradation became visible, because the underlying sender reputation was 30-90 days old going in.

Time to first safe send

Endy ships cold. Best practice is to run included warmup for 14 days, increase send volume gradually over the next 7 days, and consider the inbox production-safe around day 21. That is a real cost. If you are paying $5 per inbox per month and the inbox is unusable for the first 21 days, your effective production cost in month one is roughly $15 per usable inbox-week instead of $5. Puzzle Inbox is production-safe from day one because the warmup has already happened. On a fully-loaded basis the gap widens further.

Replacement turnaround

Every cold email infrastructure provider eventually has to deal with blacklist hits and burned reputation. The question is how fast they replace. Endy quotes 24-48 hours. In practice we saw replacements arrive in 19-31 hours during the test window, which is competitive. The replacement inbox, however, is also cold — meaning each replacement triggers another 14-21 day warmup cycle. Puzzle Inbox replacements ship pre-warmed and are immediately production-safe, which compounds the structural advantage.

Support quality

Endy support is email-only below the Agency tier with a 12-24 hour response window. Responses are technically competent but not deeply consultative — they answer the question asked, not the question you should have asked. Agency-tier customers get a dedicated Slack channel and faster turnaround. Enterprise gets a named contact. This is reasonable for the price band but is not differentiated.

Reputation portability

If you leave Endy, what do you keep? You keep your domains and DNS records. You keep your inbox passwords until they are rotated. You do not keep the warmup history because it lives on Endy's peer network. This is symmetric across the cold-provisioning category — neither Mailforge nor Inframail nor Hypertide give you portable reputation either. The pre-warmed model from Puzzle Inbox is also non-portable but the trade-off is different: you never had to build the reputation yourself.

Hidden Costs Most Endy Reviews Miss

When you price out Endy, the per-inbox monthly number is only the first line of the spreadsheet. Here are the costs that surface over the first 90 days that most published reviews skip past.

1. Lost sending days during warmup. 14-21 days per cohort of new inboxes. If you provision 100 inboxes, that is 1,400-2,100 inbox-days of paid capacity producing no campaigns. Most operators do not account for this on the P&L and it is meaningful.
2. Domain procurement markup. Endy's bundled domain pricing is reasonable but typically 15-25% above what you would pay buying directly from a registrar like Namecheap or Porkbun. At 100 domains the markup is real.
3. Replacement warmup cycles. Every replaced inbox costs another 14-21 days of warmup. If 5% of your fleet rotates each month, that is a continuous productivity drag.
4. Third-party warmup tools. Many operators end up paying for an additional warmup service (Mailwarm, Lemwarm, or similar) on top of Endy because the included warmup is not differentiated enough. Budget $20-$40 per inbox per month for this layer if you go this route.
5. Seed testing tools. Endy's dashboard does not show real inbox placement. To know whether you are actually landing in primary, you need GlockApps or Inboxally or similar. Budget another $99-$299 per month.
6. Sending tool fees. Endy provides only the inboxes. Smartlead, Instantly, or Lemlist will charge another $50-$300 per month on top.

The fully-loaded cost of running 100 Endy inboxes for the first 90 days, including warmup losses and third-party tooling, lands around $9-$13 per inbox per month versus the headline $4.50 sticker price. Operators who do the math carefully often arrive at a different provider choice than they would have based on sticker alone.

What Has Changed In The Inbox Provisioning Market In 2026

The category has shifted significantly in the last 12 months. Three forces are driving the change.

First, Google and Microsoft enforcement got tighter again in early 2026. The bulk sender requirements from 2024 are now being enforced on senders pushing as little as 1,000 messages per day in some verticals. DMARC alignment failures now trigger silent throttling rather than visible bounces. Operators relying on cold-warmed inboxes have seen placement curves degrade faster than they used to. Pre-warmed providers have absorbed less of this impact because their reputation curves were already established before the enforcement wave hit.

Second, Outlook consumer placement collapsed for cold-provisioned domains in late 2025. Outlook started weighting domain age and historical sending patterns more aggressively. New domains land in junk by default until they earn their way out. Pre-warmed inboxes that came with three months of clean sending history were largely unaffected. Cold inboxes from providers like Endy now face a steeper climb than they did 12 months ago.

Third, the consolidation wave that everyone predicted finally started. Two smaller provisioning providers exited the market in Q1 2026. A third was acquired by a sending tool. The remaining independent providers — Endy, Maildoso, Inframail, Mailforge, Hypertide, and Puzzle Inbox — are competing harder for the same buyer pool. This is generally good for buyers but it means features and pricing are moving quickly. The numbers in this review will need to be re-verified every 90 days.

How To Test Endy Without Committing

If you have read this far and you are still curious whether Endy is right for your situation, here is the cheapest way to find out without committing to a Scale or Agency contract.

1. Buy 10 inboxes on the Starter or Growth tier. Total monthly outlay around $50-$60.
2. Bring your own domains. Use a handful of domains from your existing portfolio so you can isolate provider effects from domain reputation effects.
3. Run the included warmup for 14 days, untouched. Do not add a third-party warmup tool in this window — you want to measure what Endy alone delivers.
4. Provision a parallel 10-inbox allocation on Puzzle Inbox using a similar number of Google Workspace and Outlook seats.
5. On day 15, run the same 500-recipient campaign from both pools. Same copy, same list segment, same time of day, same sending tool. The list should be freshly verified.
6. Measure inbox placement using GlockApps or Inboxally. Track Gmail primary, Gmail promotions, Outlook 365 inbox, Outlook 365 junk, and Outlook consumer placement separately.
7. Repeat the test on day 21 and day 30. Trend matters more than a single data point.
8. Make the decision based on the placement curve, not the sticker price.

Most operators who run this test arrive at the same conclusion we did. Some do not, because their specific list, copy, and vertical happen to favor the cold-provisioning model. Either way you have data instead of guessing.

Endy Inboxes FAQ

Is Endy Inboxes legit?

Yes. Endy is a real company with a stable product, working DNS automation, and a competent dashboard. The platform works as advertised. The honest question is not whether it is legit but whether it is the best choice for your use case in 2026.

How long does it take to warm up Endy inboxes?

Plan on 14-21 days minimum before sending real campaigns. The included warmup engine handles this automatically, but you should not launch production sends until day 15 at the earliest. This is the single biggest hidden cost of cold inbox providers like Endy.

What is Endy Inboxes' actual deliverability rate?

In our 40,000-message test, Endy landed in the primary inbox roughly 71-78% of the time across Gmail and Outlook. This is above the industry average of 59-62% and below pre-warmed providers like Puzzle Inbox at 88-95%.

Does Endy support both Google Workspace and Microsoft 365?

Yes. Both are supported with equivalent feature sets. Pricing is roughly equivalent between the two. If you are Outlook-heavy and price-sensitive, compare carefully against Puzzle Inbox where Outlook pricing is dramatically lower.

Can I bring my own domains to Endy?

Yes. Bring-your-own-domain is supported on all plans. You will save the domain procurement fee but you are responsible for ensuring the domains have clean reputation before delegating DNS.

Is Endy's warmup network safe?

It is safe in the sense that it will not get your account terminated. It is risky in the sense that Gmail and Outlook have learned to discount the reputation signals these peer networks generate. The warmup will happen — the question is how much real reputation lift you get from it.

What happens if an Endy inbox gets blacklisted?

Endy will notify you in the dashboard and offer to provision a replacement on a different domain. Replacement turnaround is typically 24-48 hours and is included on Scale and Agency plans.

Can I cancel Endy any time?

Yes on Starter and Growth tiers. Scale, Agency, and Enterprise tiers may include annual commitments depending on negotiated terms. Read the contract before signing anything beyond month-to-month.

Does Endy offer reply handling or list cleaning?

No. Endy is infrastructure only. You will need to layer a sending tool and a verification tool on top. If you want a more bundled experience, Puzzle Inbox integrates more tightly with downstream tooling.

Is there a free trial for Endy Inboxes?

No active free trial as of mid-2026, though the company has offered limited promotional credits to new customers from time to time. Check the current homepage for active offers before committing.

Final Verdict

Endy Inboxes is a competent, middle-of-the-market infrastructure provider. It does what it says it does. It will not surprise you in either direction. If you are early in your cold email journey, if you own domain portfolios you want to keep, or if you simply prefer the cold-and-warm-yourself model, Endy is a reasonable choice — better than Mailforge on quality, cheaper than Inframail at scale, and roughly equivalent to Maildoso and Hypertide on the metrics that matter.

However, if you are optimizing for inbox placement, time-to-launch, or fully-loaded cost per delivered email, the math points to pre-warmed providers. Puzzle Inbox in particular has restructured the economics of this category by combining a price advantage on Outlook ($0.35-$0.50 versus Endy's $3.90-$6.00) with a deliverability advantage of 10-15 percentage points across every mailbox provider we tested. For most operators most of the time, that is the winning combination.

The honest summary: Endy is fine. Puzzle is better. If you have already bought Endy and it is working, do not panic — keep using it and run a parallel test on a small Puzzle Inbox allocation to measure the difference in your specific environment. If you have not yet bought anything, start with the pre-warmed option, measure, and only fall back to cold provisioning if you have a structural reason to.

Related Reading

• Best Endy Inboxes Alternative 2026
• Best Cold Email Inboxes 2026
• Buy Pre-Warmed Cold Email Inboxes
• Cold Email Warmup Guide