Maildoso
Sells pre-warmed cold-email sending mailboxes (SMTP + Google Workspace) with automated SPF/DKIM/DMARC setup for deliverability.
RecommendedLast reviewed July 17, 2026
What Maildoso actually is.
Maildoso sells ready-to-send cold email infrastructure: mailboxes and domains that arrive pre-warmed, with SPF, DKIM, and DMARC already configured. Instead of registering domains, setting DNS records, and running a manual warmup schedule for every new sending identity, you rent mailboxes Maildoso already built and warmed. You connect them to a sequencer like Instantly, SmartLead, or Saleshandy and start sending.
The catch: standard SMTP mailboxes aren't built to land reliably in personal inboxes like Gmail or Yahoo, so a Google Workspace mailbox is the fallback if your list leans consumer. New mailboxes also need to run through a warm-up period before they're ready to send. Not instant, in other words. Mailboxes are sold in monthly packages by count, not per seat, so cost scales with volume rather than headcount.
What it does
- SMTP or Google Workspace mailboxes, pre-warmed before you start sending.
- SPF, DKIM, and DMARC configured automatically on every domain.
- IP rotation and self-healing mailboxes that recover after they burn out.
- CAPTCHA protection so bots can't link your sending domains together.
- Inbox placement tests run every three days with a health score.
- Connects directly to Instantly, SmartLead, and Saleshandy.
- Domains bill separately from mailboxes and stay yours if you leave.
It handles delivery infrastructure, not targeting or messaging.
Where it sits in the pipeline.
- AI & Intelligence
- Data & Enrichment
- Scraping & Custom Data
- Email Infrastructure & Deliverability
- Outreach & Sending
- LinkedIn & Multichannel
- Signals & Intent
- Calls & Meetings
- CRM & Pipeline Ops
Runs well with
The tools we'd run next to Maildoso, and what each pairing covers.
Pricing, without the fiction.
From the Maildoso pricing page · verified July 17, 2026
- Self-healing mailboxes with IP rotation
- CAPTCHA domain protection
- API/MCP access
- Free deliverability audits
- 30-day money-back guarantee
- Self-healing mailboxes with IP rotation
- CAPTCHA domain protection
- API/MCP access
- Free deliverability audits
- Self-healing mailboxes with IP rotation
- CAPTCHA domain protection
- API/MCP access
- Free deliverability audits
Maildoso runs flat, tiered SMTP mailbox pricing with no bulk discounts stacked on top of the published tiers: 30 mailboxes cost $75/month ($2.50 each), 300 cost $225/month ($0.75 each), and 1,000 cost $499/month ($0.50 each). The entry commitment is 30 mailboxes, not a single seat, so a small team testing the waters still pays $75/month minimum. Domains run $12/year on top, and Google Workspace mailboxes cost more than SMTP ones, starting around $3 each. Legacy quarterly plans bundle domains in but lock you into per-quarter billing. The main hedge is a 30-day money-back guarantee, but only on new monthly SMTP packages.
Choose it, or skip it.
Choose it if
- Agencies buying mailboxes for many clients at once, since flat per-mailbox pricing doesn't punish volume.
- Teams that want mailboxes pre-warmed and DNS-configured out of the box, skipping manual SPF/DKIM/DMARC setup.
- Senders who need cheap SMTP mailboxes at scale, since 1,000 mailboxes run $0.50 each.
- Teams already on Instantly, SmartLead, or Saleshandy who want a mailbox vendor that plugs straight in.
Skip it if
- Solo senders needing just a handful of mailboxes; the entry tier still assumes 30 mailboxes at $75/mo.
- Teams expecting negotiated bulk discounts; Maildoso states a flat no-discount policy across all tiers.
- Anyone defaulting to Google Workspace mailboxes; those start around $3 each, above the SMTP baseline.
If not Maildoso, then what.
- InframailUnlimited plan from $129/mo flat (also $327/mo Agency Pack, $499/mo + $3,497 setup DFY tier); price increase planned Jul
Pick Inframail for a comparable pre-warmed mailbox vendor to compare pricing against.
- Mailforgefrom $3/mailbox/mo (billed yearly, min 10 mailboxes) + $14/yr per domain; usage-based
Pick Mailforge for a similar bulk SMTP mailbox model with its own warmup pipeline.
- MailReachfrom $19.50/mailbox/mo (All-In-One warmup plan); separate pay-as-you-go spam-test credits; 20% off annual billing
Pick MailReach if the goal is warmup for existing mailboxes rather than buying new ones.
- InboxKitGoogle and Microsoft mailbox bundles; from $2.50/mailbox/mo on Enterprise annual plans.
Pick InboxKit for another pre-configured mailbox provider worth a side-by-side price check.
Asked in real client work.
How much does Maildoso cost to get started?
Entry point is 30 mailboxes for $75/month ($2.50 each). Pricing drops as volume rises: 300 mailboxes run $225/month ($0.75 each), and 1,000 mailboxes run $499/month ($0.50 each). Domains cost $12/year separately, and Google Workspace mailboxes start at $3 each, more than the SMTP baseline.
Does buying more mailboxes get you a discount?
No. Maildoso states a flat no-discount policy. The per-mailbox price already drops as tier size increases, from $2.50 down to $0.50 across the three published tiers (custom bulk plans are quoted from $0.49), but there's no additional negotiated discount stacked on top of the published tiers, regardless of contract length or volume.
What deliverability setup comes with a Maildoso mailbox?
Mailboxes ship pre-warmed with SPF, DKIM, and DMARC already configured, plus IP rotation, self-healing mailbox recovery, CAPTCHA domain protection, and inbox placement testing every 3 days. Maildoso claims 95%+ deliverability across roughly 400,000 mailboxes sending over 10 million emails a day.
Can Maildoso mailboxes plug into an existing outreach tool?
Yes. Maildoso integrates directly with Instantly, SmartLead, and Saleshandy, plus API/MCP access for automation, letting outreach campaigns send through Maildoso mailboxes without manual reconfiguration. Maildoso's own site also lists API and MCP server access for programmatic domain and mailbox creation, though most purchasing decisions still happen through the dashboard in practice.
Is there a trial or refund option?
New monthly SMTP packages carry a 30-day money-back guarantee, giving new customers a window to test deliverability before committing further. Legacy quarterly SMTP plans (32, 68, or 400 mailboxes bundled with domains) bill per quarter instead and do not carry that same monthly guarantee language.