Cheap Inboxes alternative: 100 Microsoft 365 inboxes for $30 a month

The two offers side by side

Their published tiers are 1-99 mailboxes at $3.50 / mailbox / month, 100-249 mailboxes at $3.25 / mailbox / month, 250-999 mailboxes at $3.00 / mailbox / month, 1000+ mailboxes at $2.80 / mailbox / month. They also advertise pre-warmed mailboxes as a separate paid option, which we do not offer at all.

What the two models cost over a year

At their 100-249 tier, a hundred mailboxes is $325 per month. Over twelve months that is $3,900. A hundred inboxes here is $30 per month, which is $360 over the same twelve months, plus $12 once if you want us to register the domain. Both renew monthly and both stop when the payments stop; the domain, in our case, stays in your name either way.

Stated fairly: a lower price buys a narrower service. We size a Microsoft inbox at three sends a day and a Google inbox at fifteen, and hand warmup to you after handover. Cheap Inboxes sells both platforms, pre-warmed mailboxes and cheap domains in one checkout, and if you want more of the work done for you, that catalogue is the honest answer. The trade is one thing at one price against a broader menu at a higher rate per mailbox.

Google or Microsoft

They publish both platforms at the same price. We sell both as well, priced on different axes because they are different products: Microsoft is $30 a domain a month for 100 inboxes, Google is $3 an inbox a month for up to 3 on a domain. If your recipients read their mail on Google and you want to send from Google, that is what the Google product is for.

Where Microsoft wins is when your list is on Outlook, which most enterprise, mid-market, finance, manufacturing and professional-services lists are. The tradeoffs are set out in full in Microsoft 365 vs Google Workspace for cold email.

Tenant isolation, on both sides

This is one both of us appear to take seriously, so it is worth stating plainly rather than turning into a false contrast. Cheap Inboxes publishes “one workspace, one domain, period”, and a Google Workspace is the tenant-level boundary on that platform. We provision one Microsoft 365 tenant per domain and never add a second domain to an existing one.

The reason it matters is the same on either platform. Microsoft caps external recipients per tenant rather than per mailbox, at roughly 500 times the licence count raised to the power 0.7, plus 9,500, and complaints attach to the tenant as well as the domain. Customers sharing a tenant therefore share one daily ceiling and one reputation, and neither can see the other’s sending. It is the same argument as keeping cold outreach off your primary domain, one level further up.

What their pricing page does not say is how the boundary works on their Microsoft side; the word tenant does not appear on it. If you are buying Microsoft mailboxes from anyone, that is the question to ask, and a published answer is worth more than an assumed one. Cold email tenant isolation explains what a shared tenant actually costs and how to ask about it.

The number worth asking any provider for

We publish 3 emails per inbox per day, because that is the rate the mailboxes are sized for. A provider quoting a platform ceiling instead is quoting an abuse threshold, not deliverability guidance: filters build a behavioural profile of each mailbox and ask whether it looks like a person sending mail.

Cheap Inboxes does not publish a recommended per-inbox daily rate on its pricing page. That is not a criticism of the mailboxes, which may be perfectly good, but it is the question to ask before buying from anyone, because it is what converts a mailbox count into a real daily sending capacity.

Where they are the better choice

If you want Google Workspace, want mailbox monitoring and replacement handled for you, need pre-warmed mailboxes, or want a provider that also sells cheap domains in the same checkout, Cheap Inboxes covers ground we do not. We sell one thing: Microsoft 365 inboxes, authenticated, handed over, at one monthly price per domain.

What we can show for our own sending

Across 11 of our own campaigns on this infrastructure, 26,698 leads contacted produced a 1.73% bounce rate. Reply rate was 1.9% and ranged from 0% to 4.1% campaign by campaign on identically authenticated inboxes. We publish the spread including the campaigns that replied at zero, because bounce rate is what provisioning is accountable for and reply rate depends on the list and copy, which we do not supply. The full numbers and method are published. These are our own results, not customer results.

Cheap Inboxes alternative: FAQs

Prices on both sides move. Ours are on the homepage, theirs are on their pricing page, and the date above says when this comparison was last checked. The wider category is compared in the cold email inbox buying guide.