Mailpool sells shared-IP SMTP inboxes at $2.50 a month and also resells Google Workspace and Microsoft 365 mailboxes, which means you can buy proprietary and provider-backed inboxes from one vendor. Billing is pay-as-you-go: top up, use it, pause.
For teams whose volume moves month to month, that billing model is the most attractive thing on offer here, and it is genuinely uncommon.
A note on prices. Every figure here was checked in September 2026 and infrastructure vendors change tiers often. Treat these as the shape of each offer rather than a live price list, and confirm the current number before you commit.
What you get
| Mailpool | |
|---|---|
| Model | Shared-IP SMTP inboxes, plus Google and M365 resale |
| Dedicated IP | Shared IPs on the core SMTP product; not part of the standard offer |
| Price per mailbox | $2.50 a month |
| Billing | Monthly, pay as you go |
| Domains | Bought and configured in-app |
| Warmup | Run through your own sequencer |
| Sending platform | Not included |
Pay-as-you-go is the real feature
Most infrastructure vendors want an annual commitment for their best rate, which prices your worst month as your baseline. Outbound volume is seasonal: a January push, a quiet August, a client who churns in March. Being able to pause without a contract conversation is worth more than a small per-mailbox discount to most teams under 100 mailboxes.
If flexibility is your constraint, price that in properly rather than comparing sticker rates.
What the $2.50 leaves out
Three things, none of them hidden but all of them easy to forget when comparing a per-mailbox number.
Reputation isolation. The core product is shared-IP, and a dedicated IP is not part of the standard offer. Below about 1,500 sends per IP a month that is the right technical choice anyway; above it, pooled reputation becomes your ceiling and there is no upgrade path within the product. The threshold decides whether this matters to you.
Warmup and sequencing. Both run through a tool you buy separately, so the real monthly cost is the mailbox line plus a sequencer plus lead data.
Pool management. The question with any low-cost pooled product is whether the pool is vetted, ramped and monitored, or open to anyone with a card. That difference is invisible from outside and it decides your placement more than your copy does.
Google and Microsoft resale, honestly
Buying Workspace and M365 inboxes from the same vendor as your SMTP ones is convenient, and provider-backed mailboxes carry the highest inherent sender trust available. Two things to keep in mind: resold seats are still per-seat priced, so the cost curve is linear and does not flatten as you scale; and Google and Microsoft impose their own daily sending behaviour regardless of who sold you the seat. The real per-mailbox cost of Workspace for cold email is worth reading before you scale that route.
Who Mailpool suits
- Teams with variable volume who want to pause rather than commit.
- Anyone optimising the per-inbox sticker price at modest volume.
- Teams who want SMTP, Google and Microsoft inboxes on one invoice.
Who should look elsewhere
- Senders past the volume threshold who will need a dedicated IP and would rather not change vendors to get one.
- Agencies needing per-client isolation. Shared IPs across clients is the risk that ends agencies.
- Teams who want one subscription. With warmup and sequencing bought separately, $2.50 is one line of four.
The verdict
Mailpool is a clean, cheap, flexible way to buy mailboxes, and the pay-as-you-go model is a genuine advantage that larger vendors do not match. Its limit is structural: there is no dedicated-IP path, so it is a good answer below the volume threshold and a vendor change above it.
If you would rather not have to switch later, buy from somewhere that prices both models. Mailboundry runs $2.50 monthly falling to $2.10, $1.70 to $1.30 on annual, vetted managed pools from $0.80, extra dedicated IPs at $50 a month, unlimited warmup included, and monthly, quarterly or annual billing.
Next: all six providers priced, or the head-to-head.
Frequently asked questions
What does Mailpool cost?
$2.50 per SMTP inbox per month, billed monthly and pay-as-you-go, with Google Workspace and Microsoft 365 mailboxes resold alongside. Domains are bought in-app. Warmup and sequencing are separate purchases.
Does Mailpool offer dedicated IPs?
Not as part of the standard offer, the core SMTP product sends from shared IPs. That is fine below about 1,500 sends per IP a month and becomes a ceiling above it, with no upgrade path inside the product.
What is the main advantage?
Pay-as-you-go billing. Most vendors want an annual commitment for their best rate, which prices your quietest month as your baseline. Being able to pause is worth more than a small discount for most teams under 100 mailboxes.
Is buying Google and Microsoft inboxes through a reseller a good idea?
It is convenient and provider-backed mailboxes carry the highest inherent sender trust. The cost curve stays linear because seats are per-seat priced, and the providers’ own sending behaviour applies regardless of who sold you the seat.
Who should avoid it?
Senders who will pass the volume threshold and need a dedicated IP without changing vendors, and agencies who need per-client reputation isolation.