9 Best Mailwarm Alternatives in 2026 (Compared on Network, Pricing, and Deliverability)

Introduction

Mailwarm connects you to a network of inboxes, ramps sending volume on a gradual schedule, and handles the core warmup job at a per-mailbox price point. For senders who specifically need that, a focused warmup tool that does one thing, it remains a viable choice.

The category has also broadened considerably since Mailwarm launched. Some tools have moved toward unlimited-mailbox pricing for teams scaling across many inboxes. Others have extended beyond warmup into inbox placement testing, content analysis, and sending-setup audits. 

A few are built specifically around B2B cold outreach, while others target B2C newsletters or use engagement simulation in place of peer-to-peer warmup. Different tools optimize for different setups, so the right answer depends on what you're actually trying to do.

This guide compares nine Mailwarm alternatives on three dimensions that tend to matter most when teams are choosing between them: the composition of the warmup network (not just its size), what each tool covers beyond reputation building (content, sending setup, placement testing), and how pricing behaves as you add mailboxes. 

The Three Things Deliverability Actually Depends On

Before comparing tools, it's important to understand what "deliverability" means. Email deliverability, landing in the inbox instead of spam, depends on exactly three things:

• Sender reputation: Built primarily through engagement signals, like opens, replies, lack of spam complaints. This is what email warmup directly addresses.
• Email content: The links you include, tracking pixels, HTML, specific words and expressions, attachments, signatures, image-to-text ratio. Content can land you in spam even if your reputation is perfect.
• Sending setup: Authentication (SPF, DKIM, DMARC) and the sending provider you use.

Warmup tools handle the first pillar, sender reputation through engagement. A tool that only does warmup leaves the other two pillars uncovered. 

What Pulls Teams Away from Mailwarm

Three issues come up consistently among teams comparing Mailwarm alternatives.

1. Per-mailbox pricing that doesn't scale

Mailwarm starts at $69/month for one mailbox, $159/month for three (~$53/inbox), and $479/month for ten (~$48/inbox). Annual billing applies a 13% discount. There's no free trial. For a team that adds mailboxes as outbound scales, secondary domains, additional sales reps, additional inboxes per domain, the per-mailbox cost stays roughly flat instead of dropping. Tools with sliding-scale or unlimited-mailbox pricing get materially affordable at 10, 20, or 50 mailboxes.

2. No visibility into where emails actually land

Mailwarm tells you warmup is running, but it doesn't run inbox placement tests, sending a test email to a list of seed inboxes across Gmail, Outlook, and other providers and reporting where each one landed. Without that, there's no way to know whether your campaigns are hitting the inbox, the Promotions tab, or the spam folder until replies (or silence) tell you.

Inbox placement testing is the only reliable way to test deliverability. Tools that score an email with a number out of 10 without sending it anywhere are not testing inbox placement, they're scanning content. You can score 10/10 on those tools and still land fully in spam.

3. No coverage of content or sending setup

Warmup handles sender reputation, but it doesn't catch a problematic link, a missing DKIM record, a spam-trigger expression in your subject line, or a misconfigured DMARC policy. Mailwarm doesn't analyze email content or audit sending setup. If campaigns start hitting spam after warmup is established, the diagnostic layer that would tell you why isn't there.

4. No transparency on warmup network composition

Mailwarm cites 50,000+ accounts in the warmup network. The number is fine, but the missing detail is what those accounts actually are, Google Workspace and Office 365 inboxes used by real businesses, or custom SMTP accounts spun up cheaply to fill the network. For B2B cold outreach, this mailbox network is the most important warmup variable.

Engagement signals from real Google Workspace and Office 365 mailboxes are what Google and Microsoft weigh when deciding inbox vs. spam. Engagement from custom SMTP inboxes, common in cheaper warmup pools and in the warmup networks bundled into all-in-one cold email tools, carries far less weight, because those mailboxes don't represent real recipient behavior at the providers that matter.

Network composition is the variable to ask about. Tools that don't disclose it, don't disclose it for a reason.

How These Alternatives Were Evaluated

Each tool was researched against its current pricing page (pulled May 2026), official product documentation, G2 and Capterra listings, and independent comparison reviews

The evaluation runs on a dual lens:

• Warmup quality: network composition (real Google Workspace and Office 365 inboxes vs. custom SMTPs), warmup mechanics (volume ramp + engagement, not volume alone), ESP coverage, and per-mailbox limits.
• Deliverability coverage beyond warmup: inbox placement testing across providers, content checks (links, spam expressions, HTML, tracking pixels), sending setup checks (SPF, DKIM, DMARC), and reputation monitoring.

9 Best Mailwarm Alternatives in 2026

Here’s a quick comparison table before jumping into a detailed analysis of each tool: 

Quick comparison table

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1. MailReach: Best for B2B Warmup & Inbox Placement Testing

A B2B cold outreach deliverability tool that combines email warmup with inbox placement testing in a single platform. The network composition is the key differentiator with 30,000+ inboxes that are mostly real Google Workspace and Office 365 mailboxes, not custom SMTPs,  so the engagement signals reaching your inbox are the kind Google and Microsoft actually weigh.

Key features:

• 30,000+ warmup network composed mostly of real Google Workspace and Office 365 inboxes (the providers that matter for B2B cold outreach)
• Smart warming algorithm that combines gradual volume ramp with realistic engagement signals, like opens, replies, marking as important, removing from spam 
• Inbox placement testing: Send a test email to a list of 30+ seed inboxes and see where each one landed (Gmail Primary, Promotions, Spam; Outlook Inbox, Junk; etc.) with a provider-level breakdown
• Inbox-type selector for spam tests: Choose All, Professional (Google Workspace and Office 365), or Personal (consumer Gmail, Outlook.com) so the seed list matches who you actually email
• Optional automated recurring spam tests at the frequency you set (manual by default), with Slack and webhook alerts when reputation drops or spam score falls below 10/10
• Built-in checkers for SPF, DKIM, DMARC, reverse DNS, links, spam words, and email blacklists
• Multi-account dashboard with per-domain, per-tag, and per-provider reputation tracking, built to manage hundreds or thousands of mailboxes

Strengths:

• Network composition is the strongest in the category for B2B cold outreach. Most warmup networks are filled with custom SMTP accounts that look fine on paper but generate weak engagement signals from the inbox providers' perspective. MailReach's pool is mostly Google Workspace and Office 365.
• The only tool in this comparison that bundles warmup with full inbox placement testing, sending to a real seed list and reporting per-provider results, rather than scoring content out of 10 without sending the email anywhere.
• Sliding-scale pricing: the per-mailbox cost decreases as you add mailboxes.
• Avoids cosmetic features: No template warmup, warmup-by-industry, or language warmup, none of which materially affect inbox placement and which can be actively counterproductive.

Pricing: 

From $25/mailbox/month at 1 mailbox, dropping to $19.50/mailbox at 20 mailboxes and lower at higher tiers via the sliding scale. Annual billing saves 20%. Custom pricing at 100+ mailboxes. 

Best for: B2B cold outreach teams, lead-gen and growth agencies, and tech-forward recruiting agencies running outreach across Google Workspace and Office 365, especially anyone scaling beyond a handful of mailboxes who needs warmup, inbox placement testing, content checks, and sending-setup audits in one platform.

2. Warmup Inbox: Best Budget Warmup for Solo Senders

A standalone, warmup-only SaaS focused exclusively on building sender reputation through automated email exchange. The model is straightforward: connect a mailbox via OAuth or SMTP, the tool joins it to a peer-to-peer network of 30,000 inboxes, and the mailbox starts sending and receiving warmup emails to generate engagement signals over time. 

Key features:

•  ~30,000 inbox warmup network (composition not publicly specified on the current pricing page)
•  AI-written warmup email content
• ESP-specific and language-specific warmup on higher tiers 
• Spam complaint and blacklist monitoring; SPF, DKIM, DMARC health checks

Strengths:

• 7-day no-card free trial is a low-commitment entry point, Mailwarm has none.
• $15/month (annual) Basic tier comes in well below Mailwarm's $69/month, with reasonable warmup mechanics for a single mailbox.

Limitations:

• Basic tier caps at 75 warmup emails/day. Per-mailbox pricing on every tier means cost compounds linearly as you add mailboxes.
• Network composition isn't disclosed. For B2B cold outreach, that's the variable that matters most. Some users report the Outlook side of the pool is smaller than the Gmail side, which weakens results for Office 365–heavy audiences.
• Language-specific and ESP-specific warmup are positioned as feature upgrades on higher tiers, but they're cosmetic. They don't materially change the engagement signals Google and Microsoft weigh.
• No inbox placement testing: The score and blacklist monitoring tell you what they think your reputation looks like, not where your emails are actually landing across providers.

Pricing: Basic $15/month annual ($19/month monthly), 75 emails/day. Pro $49/month annual ($59 monthly). Max $79/month annual ($99 monthly). Per-mailbox; no volume discount. 7-day free trial, no card. 

Best for: Solo senders warming 1–3 mailboxes who want low-friction warmup and don't need inbox placement testing or content/setup diagnostics.

3. TrulyInbox: Best for Multi-Mailbox Teams on a Budget

Built around an unlimited-mailbox pricing model rather than per-mailbox billing. Plans gate by total daily warmup volume across the account, 200 emails/day on Starter, 1,000 on Growth, 3,000 on Scale, and you connect as many mailboxes as you need, with the volume distributed across them. 

Key features:

• Unlimited email accounts on every paid plan
• Forever-free tier: 1 account, 10 warmup emails/day
• Three warmup strategies, AI-generated content, deliverability scoring
• ESP-level analytics and reply-rate customization on higher tiers
• Paid plans start at $22/month (annual) or $29/month (monthly) for the Starter tier (200 emails/day)

Strengths:

• Best per-mailbox value among the tools listed once you're running 5+ mailboxes. Starter unlimited at $22/month annual is materially cheaper than per-mailbox alternatives at scale.
• A real forever-free tier (limited but unrestricted on time) lets you test the warmup pattern and dashboard before paying.

Limitations:

• Network composition isn't publicly disclosed. Smaller pool than the larger competitors and with no clarity on Google Workspace / Office 365 share, harder to evaluate the quality of engagement signals you'll actually generate.
• No inbox placement testing. Diagnostics stop at deliverability scoring and ESP-level reporting.
• No coverage of the content pillar (links, spam expressions, tracking pixels, HTML) or sending-setup pillar (SPF, DKIM, DMARC audits) beyond basic checks.

Pricing: Free: 1 account, 10 emails/day. Starter $22/mo annual ($29 monthly): unlimited accounts, 200 emails/day. Growth $59/mo annual ($79 monthly): 1,000 emails/day. Scale $142/mo annual ($189 monthly): 3,000 emails/day. Verified at trulyinbox.com.

Best for: Budget-conscious teams running 5+ mailboxes who'd accept smaller, less-transparent network composition and no inbox placement testing in exchange for unlimited per-mailbox cost.

4. Lemwarm: Best for Existing Lemlist Users

The warmup module built by Lemlist, the cold email outreach platform. Originally a Lemlist-only feature, it's now also sold standalone via lemwarm.com on two tiers (Essential and Smart). 

The mechanical design is the differentiator: warmup emails are sent from the same mailbox you use for outreach campaigns inside Lemlist, and warmup auto-pauses while a live campaign is sent so the two activities don't collide. The warmup network is roughly 10,000 inboxes across multiple regions, with topic-specific routing on top. For Lemlist users, warmup and outreach share dashboard, mailbox connections, and analytics, making it the cleanest workflow integration of any tool. 

Key features:

• Tight Lemlist integration. Warmup and outreach campaigns share the same operational layer
• ~10,000 inbox warmup network across multiple regions
• Topic-specific warmup
• Auto-pauses warmup while a live campaign is sending from the same mailbox
•  40 warmup emails/day cap on the base Essential plan

Strengths:

• Cleanest workflow integration of any tool here for teams already on Lemlist. Warmup and campaigns share dashboard, mailbox connections, and analytics.
• Effectively bundled at no incremental cost for paid Lemlist users.

Limitations:

• The inbox placement test is unreliable: It asks you to send a test email to one address rather than to a list of seed inboxes across providers and a single-address test can't tell you anything meaningful about how Gmail, Outlook, Yahoo, and other providers will route your campaigns.
• Topic-specific warmup is cosmetic: Google and Microsoft don't weigh the topic of your warmup emails when deciding inbox vs. spam. What matters is the engagement on those emails, not whether they discussed marketing or finance.
• No content checks (links, spam expressions, HTML), no DNS/SPF/DKIM/DMARC audit suite. Diagnostics are limited to what Lemlist surfaces in-app.

Pricing: Standalone Essential $29/seat/month, Smart $49/seat/month. Included in Lemlist Email Pro ($63/user/month annual, $79 monthly) and Multichannel Expert ($87/user/month annual, $109 monthly).

Best for: Teams already using Lemlist for cold outreach who want warmup wired into the same workflow and who use a separate tool for inbox placement testing.

5. Warmy.io: Best for AI-Driven Warmup Customization

A pure-play warmup and deliverability platform (launched 2021) positioned at the premium end of the category. The product splits cleanly into B2B Sender and B2C Sender plans, each pulling from a separate network of business or consumer mailboxes. 

Five volume-based tiers (Starter through Platinum) gate by mailboxes and warmup intensity, plus a custom plan for enterprise. Provider-level deliverability reporting, email template analysis, DNS, and blacklist monitoring sit alongside the core warmup engine. 

Key features:

• AI engine that adjusts warmup send volume and reply patterns based on each mailbox's reputation signals
• Separate B2B Sender and B2C Sender plans. Pick a network of business mailboxes or consumer mailboxes
• 30+ language support and industry-cluster warmup segmentation (cosmetic)
• Provider-level deliverability reporting
• Email template analysis and DNS / blacklist monitoring

Strengths:

• Genuinely separates B2B and B2C warmup networks rather than mixing them. Useful when you actually need consumer-side engagement signals.
• More deliverability coverage (template analysis, DNS monitoring, provider-level reporting) than warmup-only tools.
• 7-day no-card free trial provides a real evaluation window. Mailwarm and several competitors don't.

Limitations:

• Pricing is opaque. The public Starter plan starts at $49/month per inbox, climbing to ~$129 (Business), $189 (Premium), $279 (Expert), and $429 (Platinum) per mailbox per month before annual discount. Larger teams typically end up in custom-quote territory.
• Industry-cluster and language-specific warmup are cosmetic. The engagement signals Google and Microsoft weigh don't depend on the topic or language of warmup emails, only on whether the receiving mailbox engages.
• No public detail on warmup network composition. For B2B Sender plans, the question of how much of the network is real Google Workspace and Office 365 (versus custom SMTPs) isn't answered on the pricing page.

Best for: Teams that want AI-adaptive warmup with deep customization and separate B2B vs. B2C network pools, and can absorb the per-mailbox premium.

6. Mailivery: Best for Agencies Wanting Predictable Flat-Rate Pricing

A warmup tool built around an agency-friendly flat-rate model. Every plan includes unlimited mailbox connections, and tiers gate purely by total daily warmup volume across the account (200 / 800 / 2,500 emails per day). 

The warmup network is described as a quality-controlled P2P pool, with a per-mailbox cap of 250 warmup emails per day. Beyond the warmup engine, every tier bundles email verification credits and blacklist monitoring across 70+ lists, so feature access doesn't vary by plan, only volume does. 

Key features:

• Unlimited inbox connections on every plan. Tiers gated by total warmup emails/day (200 / 800 / 2,500)
• Up to 250 warmup emails per day per connected mailbox
• Blacklist monitoring across 70+ lists, included on all tiers
• Email verification credits bundled in

Strengths:

• Flat-rate unlimited mailbox model means cost is predictable as you scale. Agencies aren't penalized for adding mailboxes.
• All features available across plans (no premium-only feature gates on lower tiers).
• 7-day no-card free trial. Lower-friction than Mailwarm's no-trial model.

Limitations:

• Network is described as a quality-controlled P2P pool, but composition isn't publicly disclosed. No detail on Google Workspace or Office 365 share. For B2B cold outreach this is the most important warmup variable.
• No inbox placement testing: Visibility stops at deliverability score and blacklist status, which doesn't tell you where emails are actually landing.
• Per-mailbox warmup volume is capped (250/day max per connected mailbox), so total volume on the plan is divided across however many mailboxes you connect.

Pricing: Starter $22/month annual ($29 monthly): 200 emails/day, unlimited mailboxes. Pro $59/month annual ($79 monthly): 800 emails/day. Business $149/month annual ($199 monthly): 2,500 emails/day. 

Best for: Agencies and sales teams managing 5+ mailboxes who prioritize predictable, flat-rate pricing over inbox placement testing or network-composition transparency.

7. Folderly: Best for Persistent Deliverability Problems at Enterprise Scale

A full deliverability platform, not just a warmup tool, sold per mailbox at enterprise pricing. The core Folderly product bundles warmup with content analysis, DNS auditing, spam-trigger identification, and AI-suggested fixes

Two companion products are sold separately: Inbox Insights handles inbox placement testing (free tier with 2 tests/month, paid tiers for higher volume), and Pulse provides free real-time deliverability alerts. 

Warmup uses a template-based model where the system warms with content closer to your real emails, a feature claim that's both differentiator and risk (covered below). The product targets enterprise teams with sustained deliverability damage rather than solo cold email senders. 

Key features:

• Warmup combined with DNS analysis, content analysis, and spam-trigger identification
• Template-based warmup using actual email content (see limitations, this is positioned as a feature but is risky)
• AI-suggested deliverability fixes
• Pulse: free real-time deliverability alerts

Strengths:

• Deepest diagnostic suite among warmup-bundled tools, content analysis, DNS audits, spam-trigger identification, and placement testing all under one roof.
• Strong reception among enterprise teams dealing with sustained deliverability damage that simple warmup can't fix.
• Free tier on Inbox Insights and free Pulse alerts let you sample part of the platform before committing to the per-mailbox subscription.

Limitations:

• Premium pricing: $96/mailbox/month on annual billing makes it the most expensive per-mailbox option on this list, and overpriced if all you need is straightforward warmup.
• Template-based warmup using your real email content is risky. Warmup emails should be 100% harmless, engineered to generate clean engagement with no risk of triggering spam filters. Pushing your real campaign content through warmup defeats that purpose and can hurt the very reputation warmup is supposed to build.
• Warmup network composition isn't publicly disclosed.

Pricing: Folderly main product: $96/mailbox/month on annual billing (20% savings). Inbox Insights: free (2 tests/month), $79/month for 100 tests, $799/year for 100 tests/month. Pulse: free. Verified at folderly.com/pricing.

Best for: Enterprise teams whose B2B cold outreach is persistently hitting spam after warmup, where the underlying issue is content triggers, DNS misconfiguration, or sustained domain reputation damage that needs an audit-and-repair workflow rather than just better warmup.

8. InboxAlly: Best for B2C Newsletters and Consumer Email

InboxAlly's native US-based engagement network performs detailed receiver-side actions on the emails you send, opens, replies, scroll-through, link clicks, and timed open duration. You retain full control of sending (the tool never gets access to your mailbox or DNS), and seed emails are routed through the engagement network from different IPs in different US locations. 

Key features:

• Simulates opens, replies, scroll-through, link clicks, and open duration
• Native US-based engagement network (not P2P warmup with other senders)
• Sender Profile model. Each profile gets a daily seed-email allocation
• Per-provider deliverability reporting
• Has its own spam test 

Strengths:

• Most behaviorally detailed engagement simulation in the category, useful for B2C senders where consumer-side opens, scrolls, and clicks are what providers weigh.
• The 10-day no-card free trial gives a real evaluation window.
• Has a built-in spam checker (sometimes overlooked in InboxAlly comparisons).

Limitations:

• Pricing scales aggressively. Starter is $149/month for 100 seed emails/day on 1 sender profile. Plus is $645/month for 500/day on 5 profiles. Premium is $1,190/month for 1,000/day on 10 profiles. Enterprise is custom.
• The network is consumer-leaning. For B2B cold outreach, where engagement from real Google Workspace and Office 365 mailboxes is what carries weight, the consumer-side engagement signals from InboxAlly's network aren't aligned with what Microsoft and Google actually weigh for business inbox placement.
• No DNS infrastructure setup or audit. Value sits in engagement depth and placement reporting, not in technical configuration of SPF, DKIM, or DMARC.

Pricing: Starter $149/month (100 seed emails/day, 1 sender profile). Plus $645/month (500/day, 5 profiles). Premium $1,190/month (1,000/day, 10 profiles). Enterprise custom. 10-day free trial, no card. Verified at inboxally.com.

Best for: B2C newsletter publishers, list owners, affiliate marketers, and consumer email senders who need engagement-rich placement signals from a US consumer network and can absorb the unit cost. Less aligned with B2B cold outreach.

9. Warmbox: Best for Visual Warmup Control on a Single Mailbox

A warmup tool built around a real-time visual dashboard and customizable warmup "recipes," where most warmup tools run a fixed daily ramp, Warmbox lets users pick from four behavioral profiles, including Progressive (gradual increase), Flat (constant volume), Randomize (variable daily volume), and Custom (user-defined curve), with timezone targeting layered on top. 

Warmup email content is generated using GPT-4 to read more naturally than older templated output. The product is structured around three tightly-scoped tiers (Solo, Start-up, Growth) with hard mailbox caps (1 / 3 / 6 inboxes) and per-mailbox daily volume limits (50 / 250 / 500 emails). Above 6 mailboxes, agencies need a custom enterprise plan. 

Key features:

• GPT-4-generated warmup email content
• Four warmup recipe types: Progressive, Flat, Randomize, Custom
• Timezone targeting
• Real-time dashboard showing reply rates, spam recovery, and daily limits
• Domain health alerts and a free IP/blacklist/DNS checker
• Three plan tiers, Solo (1 mailbox, 50 emails/day), Start-up (3 mailboxes, 250/day), Growth (6 mailboxes, 500/day)

Strengths:

• GPT-4 content reads more naturally than older template-based warmup output.
• Four warmup recipes provide more behavioral control than Mailwarm's basic scheduling.
• Solo plan starts at $15/month (annual), one of the lowest entry prices in the category for a single mailbox.

Limitations:

• No inbox placement testing, no per-provider breakdown of where warmup or campaign emails actually land.
• Mailbox caps are tight: 6 mailboxes maximum on the top standard plan (Growth). Beyond 6, agencies need custom enterprise pricing.
• Network composition isn't publicly disclosed.
• Daily warmup volume is capped relatively low (50 emails/day on Solo, 250/day on Start-up, 500/day on Growth), the per-mailbox warmup cap matters as much as the inbox count.
• No content analysis (links, spam expressions, HTML) and no SPF/DKIM/DMARC audit suite.

Pricing: Solo $15/month annual ($19 monthly): 1 mailbox, 50 emails/day. Start-up $69/month annual ($79 monthly): 3 mailboxes, 250 emails/day. Growth $139/month annual ($159 monthly): 6 mailboxes, 500 emails/day. Custom enterprise above 6 mailboxes. 

Best for: Solo senders or very small teams (≤6 mailboxes) wanting visible warmup recipes and dashboard-level control, without the diagnostic depth of placement testing or content audit.

Which Mailwarm Alternative Fits Your Setup?

The right tool depends on what's actually pulling you away from Mailwarm and on what you send.

"I run B2B cold outreach across Google Workspace or Office 365, and I need to know where my emails actually land, not just that warmup is running."

MailReach: The combination of a warmup network composed mostly of real Google Workspace and Office 365 mailboxes, full inbox placement testing to a 30+ inbox seed list, content checks (links, spam words), and SPF/DKIM/DMARC audits is the closest fit. Sliding-scale pricing keeps the per-mailbox cost moving down as you add mailboxes.

"I just want basic warmup on 1–3 mailboxes, cheaper than Mailwarm, with a free trial so I can test it first."

Warmup Inbox at $15/month annual is the closest direct swap. TrulyInbox's forever-free tier (10 emails/day) is also a no-risk way to evaluate warmup mechanics before committing.

"I'm an agency warming 10–50 mailboxes and per-mailbox pricing is killing my margins."

If predictable flat-rate cost is the priority and inbox placement testing isn't, Mailivery or TrulyInbox give you unlimited mailboxes at a fixed monthly fee. If you also need placement testing and per-domain reputation tracking, typical for agencies managing client deliverability, MailReach's sliding scale plus per-domain dashboards is built for that.

"I want the deepest customization the warmup engine can offer."

Warmy.io. AI-adaptive warmup, separate B2B and B2C network pools, a 7-day free trial. Highest unit cost in this group at scale.

"I'm already paying for Lemlist for outreach."

Lemwarm is included in Email Pro and Multichannel Expert at no incremental cost, and the workflow is the cleanest of any tool here. Pair it with a separate inbox placement testing tool, since Lemwarm's spam test (single-address only) isn't reliable on its own.

"My emails are still going to spam after warmup and warmup itself isn't the problem."

Warmup builds reputation. If reputation is fine but emails still hit spam, the cause is on the content pillar (links, spam expressions, HTML, tracking pixels) or the sending-setup pillar (SPF, DKIM, DMARC, your sending provider). MailReach covers both with content checks and the audit suite. Folderly is the option for enterprise teams with sustained reputation damage that needs a deeper repair workflow.

Choosing the Right Warmup Tool for B2B Cold Outreach

Mailwarm covers the basics on a single mailbox. For B2B cold outreach teams scaling across Google Workspace and Office 365, three things separate genuine alternatives from cheaper-but-similar options: a warmup network composed of real business inboxes (not custom SMTPs), inbox placement testing that actually sends to a seed list across providers, and pricing that gets meaningfully cheaper as you add mailboxes.

Warmup-only options at lower cost (Warmup Inbox, TrulyInbox, Mailivery, Warmbox) handle the reputation pillar reasonably for smaller setups but leave content and sending setup uncovered. Lemwarm wins on workflow integration for existing Lemlist users but its spam test is unreliable. Warmy goes deepest on warmup engineering at premium per-mailbox cost. Folderly is built for enterprise teams with sustained deliverability damage. InboxAlly fits B2C newsletters, not B2B cold outreach.

MailReach is built specifically for B2B cold outreach across Google Workspace and Office 365. The warmup network is composed mostly of real business mailboxes at those providers, the inbox placement test sends to a 30+ seed list and reports per-provider results, and the All-In-One plan covers the content and sending-setup pillars alongside warmup, content checks, link analysis, spam-word checking, SPF/DKIM/DMARC audits, reputation alerts. 

See how MailReach handles B2B warmup

If you're running B2B cold outreach across Google Workspace and Office 365 and want warmup, inbox placement testing, and content/sending-setup checks in one platform, MailReach is built for that specifically.