Warmup Inbox charges $19 per inbox per month on its Basic plan, which makes it one of the cheaper per-inbox email warm up tools you can buy. I've tested it alongside a handful of other tools in this space, and for a single Gmail account, it does what it says. Clean dashboard, simple setup, reputation score goes up.
But I kept running into the same friction points. The Basic plan caps you at 75 warmup emails per day. The features you actually want (ESP targeting, schedule control, language options) are locked behind a $59/inbox Pro tier. And the moment you add a second or third inbox, the per-inbox model starts to hurt.
Three inboxes on Basic is $57/month.
Ten on Pro is $590/month.
That's a lot of money for a tool that only does warmup.
So this is a Warmup Inbox alternative post, but an honest one. I'll show you exactly where Warmup Inbox holds up, where it breaks down, and when Mailivery makes more sense. Our pricing runs on daily warmup volume instead of per-inbox fees, so you connect as many mailboxes as you want starting at $29/month.
At a single inbox, Warmup Inbox Basic is $10/month cheaper. But you're getting a 75 email/day cap, a 30,000-inbox network (compared to Mailivery's 100,000+), no email verification, no inbox placement testing, and no B2C support. Mailivery's $29/month Starters plan includes all of that.
By 2 inboxes, Mailivery is already cheaper. Warmup Inbox Basic at 3 inboxes costs $57/month. Mailivery's Starters plan covers all 3 for $29/month with more daily volume, a bigger network, and more features bundled in. At 10 inboxes, the gap is huge: $190-$990/month at Warmup Inbox versus $79/month at Mailivery.
Best for a single Gmail inbox on a tight budget: Warmup Inbox Basic ($19/mo).
Best for 2+ inboxes, agencies, or anyone who wants everything bundled: Mailivery ($29-$199/mo).
Warmup Inbox has genuine strengths that explain why people use it.
Setup takes about two minutes. Connect your email account and the warmup starts. No complicated configuration, no DNS changes beyond what you've already done for SPF/DKIM/DMARC. For someone who just wants warm-up running in the background without thinking about it, the simplicity is real.
The dashboard gives you a reputation score that updates over time. You can track whether you're trending toward inbox or spam, and the visual layout makes it easy to understand at a glance. If you're managing one account, it's all the visibility you need.
Their network of 30,000+ real inboxes handles the warm-up interactions, and most users see reputation improvements within the first couple of weeks on Gmail accounts. Support responses are also fast when you need help.
The problems show up once you look past the $19 headline price.
Every mailbox costs another $19-$99/month. Three inboxes on Basic costs $57. Ten costs $190. On Pro, ten inboxes costs $590/month. On Max (their top tier), ten inboxes costs $990. Agencies managing 20+ client inboxes are looking at $380-$1,980/month just for warmup. Mailivery covers that same inbox count for $79/month.
That's a low ceiling. For mailboxes that need aggressive reputation repair or that will be sending high-volume campaigns, 75 daily interactions isn't enough to build momentum. Unlocking higher volume means upgrading to Pro at $59/inbox (250 emails/day) or Max at $99/inbox (1,000 emails/day), which gets expensive per mailbox fast.
ESP-specific warmup, sending schedule customization, and language-specific warmup are all gated to the $59/inbox Pro plan. So the tool that markets itself as affordable charges $59/inbox to access features that Mailivery includes on every plan starting at $29/month total.
Multiple users report that Warmup Inbox's 30,000-inbox network is mostly Google Workspace accounts. When warming an Outlook or Microsoft 365 mailbox, users see slower warm-up and fewer engagement signals. If your prospects sit in Outlook inboxes, this matters. Mailivery's 100,000+ mailbox network is more diverse across providers.
Several reviews on G2 mention email accounts getting blocked within a week of connecting to Warmup Inbox. It's not the norm, and most users don't hit this issue. But it's worth knowing before you connect a domain that your business depends on.
Warmup Inbox is built for cold email. If you're warming inboxes for e-commerce, newsletters, or transactional email, it's not designed for you.
Warmup Inbox recommends keeping your inbox synced for 45-90 days minimum. Most warm-up tools (Mailivery included) show measurable results in about 14 days. A longer recommended timeline means a longer commitment before you know if it's working for your setup.
Mailivery's peer-to-peer network has over 100,000 active mailboxes, more than 3x the size of Warmup Inbox's network. But the real advantage is diversity. Our network includes big brands, seed mailboxes, CRM users, cold emailers, and dedicated warmup inboxes across multiple email providers. When Gmail and Outlook see your email being opened, replied to, and rescued from spam by this range of senders, they read it as natural behavior. A network that's mostly Gmail accounts produces engagement patterns that look the same every time. A diverse network produces the variety that builds real, lasting sender reputation.
Mailivery charges by daily warmup volume, not per inbox. The Starters plan ($29/month) gives you 200 warm up emails per day. Professional ($79/month) gives you 800. Business ($199/month) gives you 2,500. Connect as many mailboxes as you want on any plan and split the volume however you need. Ten inboxes costs the same as three.
Blacklist monitoring across 70+ lists, email verification credits, inbox placement testing, full REST API access, team management, custom warmup templates, and auto-archiving are all on every plan. There's no "Pro" upgrade to unlock features. You get the full platform from day one.
Mailivery powers leading email infrastructure and is used by agencies and SaaS companies to manage warm-up at scale. The REST API on every plan makes it practical to integrate warmup into your own platform, build white-label setups, or run multi-client workflows. When your business runs on email deliverability across dozens of client accounts, you need warm-up that scales without per-inbox math eating your margins.
Mailivery handles both. Cold outreach, e-commerce, newsletters, transactional sends. One email warm-up service, one plan, one network.
Starters includes a 7-day free trial so you can test before committing.
Here's how both email warmup tools compare on the features that matter most:
| Feature | Mailivery | Warmup Inbox |
|---|---|---|
| Pricing Model | Flat rate by volume ($29-$199/mo) | Per inbox ($19-$99/inbox/mo) |
| Mailbox Connections | Unlimited on every plan | 1 per subscription |
| Daily Warmup Volume | 200-2,500/day (shared across inboxes) | 75-1,000/day per inbox (depends on tier) |
| Warmup Network | 100,000+ active mailboxes (diverse) | 30,000+ inboxes (Gmail-heavy) |
| B2C Warmup | Yes | No |
| Blacklist Monitoring | 70+ blacklists | Basic |
| Email Verification | Included | Not included |
| Inbox Placement Testing | Included | Free spam checker (separate) |
| API Access | Full REST API, all plans | Limited API |
| Feature Gating | None | ESP warmup, scheduling, language locked to $59/inbox Pro |
| Free Trial | 7-day (Starters) | 7-day |
Data sourced from each tool's pricing page and user reviews, verified April 2026.
The $19/inbox price looks great until you start multiplying. Here's what both tools cost as you add mailboxes:
| Inbox Count | Mailivery | Warmup Inbox (Basic $19) | Warmup Inbox (Pro $59) | Warmup Inbox (Max $99) |
|---|---|---|---|---|
| 1 inbox | $29/mo | $19/mo | $59/mo | $99/mo |
| 3 inboxes | $29/mo | $57/mo | $177/mo | $297/mo |
| 5 inboxes | $29/mo | $95/mo | $295/mo | $495/mo |
| 10 inboxes | $79/mo | $190/mo | $590/mo | $990/mo |
| 20 inboxes | $79/mo | $380/mo | $1,180/mo | $1,980/mo |
| 50 inboxes | $199/mo | $950/mo | $2,950/mo | $4,950/mo |
How we mapped Mailivery plans: We estimated 30-50 warm-up emails per inbox per day. Five inboxes fit Starters (200/day). Ten to twenty fit Professional (800/day). Fifty use Business (2,500/day). Warmup Inbox pricing is straight multiplication at $19 (Basic), $59 (Pro), or $99 (Max) per inbox.
The crossover point is 2 inboxes. Below that, Warmup Inbox Basic is cheaper. Above it, Mailivery wins on both price and features. At 10 inboxes on Warmup Inbox Pro (the tier you need to get features Mailivery includes by default), the annual difference is over $6,100. At Max, you're looking at over $10,900 a year for the same 10 inboxes.
For a broader look at how 11 warm-up tools compare on pricing, check our full email warmup tool roundup.
Warmup Inbox makes sense if: You're running a single Gmail inbox for cold outreach, you're okay with 75 warmup emails per day, and you don't need verification or B2C support. At $19/month, it's a low-risk starting point.
Mailivery makes more sense if: You have more than 2 inboxes. You need ESP warmup or scheduling without paying $59/inbox for them. You want a 100,000+ mailbox network instead of 30,000. You're warming Outlook accounts and need provider diversity. You're an agency or SaaS platform that needs API access. Or you want email verification, inbox placement testing, and 70+ blacklist monitoring without paying for separate tools.
For more detail on what users think about Warmup Inbox, check our Warmup Inbox reviews roundup. And if MailReach is also on your shortlist, see our Mailivery vs MailReach comparison.
For a single inbox, it can work. At $19/month on Basic it does the job. But the 75 email/day cap on Basic is limiting, Pro features cost $59/inbox, and the per-inbox model gets expensive fast once you add mailboxes. Mailivery gives you unlimited mailboxes, a 3x larger network, and every feature included for $29/month.
$19/inbox on Basic, $59/inbox on Pro, $99/inbox on Max. Ten inboxes runs $190-$990/month depending on tier. Twenty inboxes runs $380-$1,980/month. Mailivery covers 20 inboxes for $79/month on Professional.
Yes, 7 days. Mailivery also offers a 7-day free trial on Starters, so you can test both before paying anything.
Basic is $19/inbox with a 75 email/day cap and limited features. Pro is $59/inbox with ESP-specific warmup, scheduling, language options, and up to 250 emails/day. Max is $99/inbox with higher reply rates, premium support, and up to 1,000 emails/day. Mailivery includes all of those features on every plan starting at $29/month, no upgrade required.
Users report mixed results. The network is mostly Gmail accounts, so Outlook and Microsoft 365 warm-up tends to be slower with fewer engagement signals. Mailivery's network is more diverse across providers, which produces more balanced results for Outlook accounts.
Mailivery. Unlimited mailboxes at flat pricing, a 100,000+ mailbox network, and full API access on every plan. Agencies and SaaS platforms use Mailivery to power their email infrastructure without worrying about per-inbox costs eating into margins.
Warmup Inbox charges $19-$99/inbox/month. Mailivery is $29-$199/month flat with unlimited mailboxes. At 1 inbox, Warmup Inbox Basic is $10/month cheaper. At 3+ inboxes, Mailivery is more affordable and includes more features. At 10 inboxes, the monthly savings range from $111 to $911 depending on which Warmup Inbox tier you'd need.
Warmup Inbox has a lower single-inbox price ($19 vs $29). Mailivery wins on everything else: 100,000+ vs 30,000+ network, unlimited mailboxes, no feature gating, email verification and 70+ blacklist monitoring included, B2B and B2C support, and API access. For anything beyond one mailbox, Mailivery is the better value.
Want to test Mailivery yourself? See pricing or start a free 7-day trial.
The easiest way to get responses to your cold emails.
