StackMail review (2026): pricing, pros and cons, alternatives

What StackMail is

StackMail is a self-serve reseller of Google Workspace and Microsoft 365 mailboxes for cold email, sold in bundles of 10, 30 or 100 with DNS done for you and a separate admin panel for every domain. It pitches itself on affordability and on being simple enough for someone who is not an infrastructure expert, and its site is built around comparisons with InboxKit, Zapmail, Mailforge and the big sequencers. The company behind it is not named on the site, and the only customer figure is a claim of thousands of sales teams and agencies.

StackMail pricing

The price is the same whether you choose Google Workspace or Microsoft 365. On monthly billing, Starter is $39 for 10 mailboxes with extras at $3.50 each, Growth is $99 for 30 with extras at $3.25, and Pro is $299 for 100 with extras at $2.99, API access and priority support. Quarterly billing takes 10 percent off, to $35, $90 and $270 a month with extras at $3.25, $3.00 and $2.70. Annual billing takes 20 percent off, to $31, $81 and $250 a month with extras at $3.00, $2.75 and $2.50. The headline of $2.50 a mailbox is therefore the Pro plan with a year prepaid. Volume discounts above 50 mailboxes are offered on request, domains are priced in the app, and no card is needed to sign up.

The refund policy is clearer than most. A first monthly subscription can be refunded in full within 7 days if the service has not been used extensively; quarterly cycles are refundable pro rata within 14 days and annual cycles within 30 days. Outside those windows fees are non-refundable, the terms allow price changes on 30 days of notice, and the acceptable use policy requires unsubscribe requests to be honoured within 10 business days.

Setup and integrations

Setup is self-serve and the site says it takes about 10 minutes. Bring a domain or buy one through StackMail, and SPF, DKIM and DMARC are configured for you; mailboxes are created in bulk; and each domain lives in its own isolated panel so that a reputation problem on one does not touch the others. Team members are unlimited. Mailboxes export to Instantly, Smartlead, Saleshandy, Apollo, Lemlist and Woodpecker, and the Pro plan adds API access. Email health monitoring and a set of free checkers for SPF, DKIM, DMARC, blacklists and inbox placement round it out. Warmup is not included and happens in your sequencer.

Deliverability

Because these are Google and Microsoft accounts, they begin with the reputation those providers lend their own tenants, and the per-domain panels keep a burned domain from spreading. Google accounts are described as US or EU IP accounts. Beyond the monitoring and the free placement tests, the site makes few deliverability claims, which is sensible for a reseller.

Who StackMail is for, and who should look elsewhere

StackMail suits agencies and teams buying 30 to 100 mailboxes that want isolated panels, a choice of billing cycle and a self-serve setup. It is a poorer fit for a team that wants exactly 10 inboxes at the lowest price, warmup inside the package, or a person to do the setup. InboxKit sells the same account types at one flat rate with no bundles, Zapmail sells Google and Microsoft inboxes with a cheaper entry point, and Premium Inboxes resells both on a monthly plan. The inbox provider comparison scores all of them.

Where PureMail is cheaper, and where StackMail wins

PureMail’s Google Workspace and Microsoft 365 inboxes with setup done for you cost $3.30 each for 10, $3.10 for 30 to 100 and $2.90 for 101 or more, billed monthly, with SPF, DKIM, DMARC and MX configured and the sequencer connected in about four hours. On monthly billing PureMail is cheaper at every size: $33 against $39 for 10, $93 against $99 for 30 and $310 against $335 for 100 once you add the extras it takes to match. At 10 inboxes PureMail stays cheaper on every StackMail cycle, since even the annual Starter rate is $3.10. Full details are on the pricing page.

StackMail wins once you prepay: on quarterly billing it is $3.00 a mailbox at 30 and $2.70 at 100, and on annual billing $2.70 and $2.50, all below PureMail at those sizes, with refund windows if you change your mind early. It also offers isolated panels per domain, flexible cycles and an API on Pro. For a self-serve agency that is happy to commit for a quarter or a year, it is a fair option. The table below puts the two side by side.