MailDeck vs Maildoso: private SMTP with Outlook and Google on the side, against SMTP packs with an API and MCP
Both sell cheap SMTP volume to teams that already pay for a sequencer. MailDeck adds Outlook tenants and Google Workspace and builds everything by hand on your domains. Maildoso is SMTP only, sold in packs, self-serve in minutes, with an API and an MCP server. Neither runs warm-up for you.
- Warm-up and sending included
- $2.50 a mailbox, 12 minimum
- Month-to-month billing
MailDeck
Maildoso
- Price per mailbox
- from $0.30 (Outlook, $30 a tenant of 100)from $0.49 on the 1,000 plan; $2.50 on the 30 plan
- Smallest order
- 2 Outlook tenants (200 inboxes, $60 a month); Google 10 inboxes ($39); SMTP 100 inboxes ($50)30 mailboxes, $75 a month, on the standard plans
- Mailbox types
- Google, Microsoft, SMTPSMTP
- Warm-up
- MailDeck switches it on in your sequencer, which runs it; 3–7 days on Outlook, 15 days on Google, 3–4 weeks on SMTP before cold emailNot provided; 14+ days in an outside tool such as the Instantly pool, kept running
MailDeck vs Maildoso, line by line
Each cell links to the vendor's page it comes from.
| Feature | MailDeck | Maildoso |
|---|---|---|
| Smallest order | 2 Outlook tenants (200 inboxes, $60 a month); Google 10 inboxes ($39); SMTP 100 inboxes ($50) source (opens the vendor's page in a new tab) | 30 mailboxes, $75 a month, on the standard plans source (opens the vendor's page in a new tab) |
| Setup time | 48–72 hours by MailDeck's team; Google instant, SMTP within 24 hours, Outlook 2–3 business days per the FAQ source (opens the vendor's page in a new tab) | A new domain up to 15 minutes, an existing domain up to 24 hours, a mailbox 5 minutes source (opens the vendor's page in a new tab) |
| Mailbox types | Microsoft 365 tenants (up to 100 inboxes on one domain), Google Workspace and private SMTP (5 inboxes per domain) source (opens the vendor's page in a new tab) | SMTP only; the Google Workspace product is unavailable for new mailboxes source (opens the vendor's page in a new tab) |
| Domains | Bring your own, bought at a registrar other than Cloudflare; domains cannot be bought in the app source (opens the vendor's page in a new tab) | Bought through Maildoso and registered to it while you are a customer; free transfer to you on request; 8 mailboxes per domain recommended source (opens the vendor's page in a new tab) |
| Sending limits | Pricing page: Outlook 4–5 (Premium 8–10), Google 20, SMTP 10–15 cold emails per inbox a day; help docs: Outlook 10, Premium 12, Google about 20, SMTP 8 source (opens the vendor's page in a new tab) | Up to 15 cold emails and 80 warm-up emails per mailbox a day; corporate recipients only source (opens the vendor's page in a new tab) |
| Warm-up | Partly, or at extra costMailDeck switches it on in your sequencer, which runs it; 3–7 days on Outlook, 15 days on Google, 3–4 weeks on SMTP before cold email source (opens the vendor's page in a new tab) | Not includedNot provided; 14+ days in an outside tool such as the Instantly pool, kept running source (opens the vendor's page in a new tab) |
| Sequencers | Team adds inboxes to Instantly, Plusvibe, Smartlead, EmailBison or Manyreach with your sequencer login; the site lists more SMTP tools source (opens the vendor's page in a new tab) | One-click sync to Instantly, Smartlead and EmailBison; CSV for 9 sequencers source (opens the vendor's page in a new tab) |
| API | Partly, or at extra cost"Full API access with webhooks" listed on the Google plans; no public API documentation found source (opens the vendor's page in a new tab) | IncludedREST API on every plan: domains, mailboxes, exports, forwarding, stats source (opens the vendor's page in a new tab) |
| MCP server | Not includedNone found on the site or in the help docs source (opens the vendor's page in a new tab) | IncludedHosted MCP server at mcp.maildoso.com, same token as the API source (opens the vendor's page in a new tab) |
| Support | Live chat in the app, a private Slack channel per customer, email and the Maya AI assistant; "24/7 priority support" on the home page source (opens the vendor's page in a new tab) | Website chat, email and a Slack community; US ET 2 AM–5 PM source (opens the vendor's page in a new tab) |
| Refunds | Only for trial users with one tenant, within 30 days, if mailboxes were not delivered working within 10–14 business days; one refund per customer source (opens the vendor's page in a new tab) | 30-day guarantee on monthly packs, paid only if mailboxes fail to send 3+ days in a row through Maildoso's fault; domains non-refundable source (opens the vendor's page in a new tab) |
| Trial | Not published; the refund policy refers to "trial users with a single tenant" source (opens the vendor's page in a new tab) | A "300 mailboxes for 30 days" offer page; price not shown source (opens the vendor's page in a new tab) |
Smallest order
- MailDeck
- 2 Outlook tenants (200 inboxes, $60 a month); Google 10 inboxes ($39); SMTP 100 inboxes ($50) source (opens the vendor's page in a new tab)
- Maildoso
- 30 mailboxes, $75 a month, on the standard plans source (opens the vendor's page in a new tab)
Setup time
- MailDeck
- 48–72 hours by MailDeck's team; Google instant, SMTP within 24 hours, Outlook 2–3 business days per the FAQ source (opens the vendor's page in a new tab)
- Maildoso
- A new domain up to 15 minutes, an existing domain up to 24 hours, a mailbox 5 minutes source (opens the vendor's page in a new tab)
Mailbox types
- MailDeck
- Microsoft 365 tenants (up to 100 inboxes on one domain), Google Workspace and private SMTP (5 inboxes per domain) source (opens the vendor's page in a new tab)
- Maildoso
- SMTP only; the Google Workspace product is unavailable for new mailboxes source (opens the vendor's page in a new tab)
Domains
- MailDeck
- Bring your own, bought at a registrar other than Cloudflare; domains cannot be bought in the app source (opens the vendor's page in a new tab)
- Maildoso
- Bought through Maildoso and registered to it while you are a customer; free transfer to you on request; 8 mailboxes per domain recommended source (opens the vendor's page in a new tab)
Sending limits
- MailDeck
- Pricing page: Outlook 4–5 (Premium 8–10), Google 20, SMTP 10–15 cold emails per inbox a day; help docs: Outlook 10, Premium 12, Google about 20, SMTP 8 source (opens the vendor's page in a new tab)
- Maildoso
- Up to 15 cold emails and 80 warm-up emails per mailbox a day; corporate recipients only source (opens the vendor's page in a new tab)
Warm-up
- MailDeck
- Partly, or at extra costMailDeck switches it on in your sequencer, which runs it; 3–7 days on Outlook, 15 days on Google, 3–4 weeks on SMTP before cold email source (opens the vendor's page in a new tab)
- Maildoso
- Not includedNot provided; 14+ days in an outside tool such as the Instantly pool, kept running source (opens the vendor's page in a new tab)
Sequencers
- MailDeck
- Team adds inboxes to Instantly, Plusvibe, Smartlead, EmailBison or Manyreach with your sequencer login; the site lists more SMTP tools source (opens the vendor's page in a new tab)
- Maildoso
- One-click sync to Instantly, Smartlead and EmailBison; CSV for 9 sequencers source (opens the vendor's page in a new tab)
API
- MailDeck
- Partly, or at extra cost"Full API access with webhooks" listed on the Google plans; no public API documentation found source (opens the vendor's page in a new tab)
- Maildoso
- IncludedREST API on every plan: domains, mailboxes, exports, forwarding, stats source (opens the vendor's page in a new tab)
MCP server
- MailDeck
- Not includedNone found on the site or in the help docs source (opens the vendor's page in a new tab)
- Maildoso
- IncludedHosted MCP server at mcp.maildoso.com, same token as the API source (opens the vendor's page in a new tab)
Support
- MailDeck
- Live chat in the app, a private Slack channel per customer, email and the Maya AI assistant; "24/7 priority support" on the home page source (opens the vendor's page in a new tab)
- Maildoso
- Website chat, email and a Slack community; US ET 2 AM–5 PM source (opens the vendor's page in a new tab)
Refunds
- MailDeck
- Only for trial users with one tenant, within 30 days, if mailboxes were not delivered working within 10–14 business days; one refund per customer source (opens the vendor's page in a new tab)
- Maildoso
- 30-day guarantee on monthly packs, paid only if mailboxes fail to send 3+ days in a row through Maildoso's fault; domains non-refundable source (opens the vendor's page in a new tab)
Trial
- MailDeck
- Not published; the refund policy refers to "trial users with a single tenant" source (opens the vendor's page in a new tab)
- Maildoso
- A "300 mailboxes for 30 days" offer page; price not shown source (opens the vendor's page in a new tab)
MailDeck and Maildoso prices
MailDeck
| Plan | Price | Mailboxes | Per mailbox | Billing | Includes |
|---|---|---|---|---|---|
| Outlook Normal | $30 a month | per tenant, 100 inboxes | $0.30 | monthly | One Microsoft 365 tenant on one domain; 4–5 cold emails per inbox a day on the pricing page source (opens the vendor's page in a new tab) |
| Outlook Mixed | $35 a month | per tenant, 50 Normal + 50 Premium | $0.35 | monthly | Normal and Premium licences on one domain source (opens the vendor's page in a new tab) |
| Outlook Premium | $40 a month | per tenant, 100 inboxes | $0.40 | monthly | Extra deliverability configuration; 8–10 cold emails per inbox a day on the pricing page source (opens the vendor's page in a new tab) |
| Pre-warmed Outlook | $40 a month | per tenant, 100 inboxes | $0.40 | monthly | Runs on MailDeck's own warmed domains; availability varies source (opens the vendor's page in a new tab) |
| Google Workspace Starter | $39 a month | 10 (extra $3.50) | $3.90 | monthly | Up to 20 cold emails per inbox a day; 5 inboxes per domain source (opens the vendor's page in a new tab) |
| Google Workspace Growth | $99 a month | 30 (extra $3.25) | $3.30 | monthly | Same; covers 6 domains source (opens the vendor's page in a new tab) |
| Google Workspace Enterprise | $299 a month | 100 (extra $2.99) | $2.99 | monthly | Same; covers 20 domains, Slack support source (opens the vendor's page in a new tab) |
| Private SMTP | $0.50 a month | per inbox, 100 minimum | $0.50 | monthly | Dedicated IP per client; 5 inboxes per domain source (opens the vendor's page in a new tab) |
| Diversified Starter | $99 a month | 200 Outlook Premium + 10 SMTP + 5 Google | $0.46 | monthly | 40,000 cold sends a month per MailDeck; 5 domains to bring source (opens the vendor's page in a new tab) |
| Diversified Growth | $399 a month | 1,000 Outlook Premium + 100 SMTP + 30 Google | $0.35 | monthly | 215,000 cold sends a month per MailDeck; 36 domains to bring source (opens the vendor's page in a new tab) |
| Diversified Enterprise | $3,499 a month | 10,000 Outlook Premium + 1,000 SMTP + 300 Google | $0.31 | monthly | 2.15M cold sends a month per MailDeck; 360 domains to bring source (opens the vendor's page in a new tab) |
Maildoso
| Plan | Price | Mailboxes | Per mailbox | Billing | Includes |
|---|---|---|---|---|---|
| 30 mailboxes | $75 a month | 30 | $2.50 | monthly | IP rotation, self-healing mailboxes, placement tests, API and MCP; domains extra source (opens the vendor's page in a new tab) |
| 300 mailboxes | $225 a month | 300 | $0.75 | monthly | Same features; domains extra source (opens the vendor's page in a new tab) |
| 1,000 mailboxes | $499 a month | 1,000 | $0.49 | monthly | Same features; domains extra source (opens the vendor's page in a new tab) |
List prices from MailDeck's pricing page and Maildoso's pricing page, checked . Taxes and card fees excluded.
Cost at 300 and 1,000 SMTP inboxes
300 inboxes: MailDeck private SMTP is $0.50 each, $150 a month, on 60 domains you buy (5 per domain). Maildoso's 300 pack is $225 a month on about 38 domains at 8 per domain, bought through Maildoso at $15 a year each.
1,000 inboxes: MailDeck is $500 a month ($0.45 from 1,001), on 200 domains. Maildoso's 1,000 pack is $499 a month on about 125 domains.
Sends per inbox decide the rest. Maildoso allows up to 15 cold emails a day. MailDeck's pricing page says 10 to 15 for SMTP and its help docs say 8, so 1,000 MailDeck SMTP inboxes send 8,000 to 15,000 a day against up to 15,000 on Maildoso. MailDeck's FAQ prices Maildoso at about $2.50 an inbox; that is Maildoso's 30-mailbox pack, and its larger packs cost $0.75 and $0.49.
Where they differ
What each one sells
MailDeck: private SMTP on a dedicated IP per client, Microsoft 365 tenants of 100 inboxes from $30 and Google Workspace from $39 for 10, built by its team in 48 to 72 hours. Maildoso: SMTP on its own servers with IP rotation and self-healing mailboxes; its Google Workspace product is closed to new mailboxes.
If you want Outlook or Google senders next to SMTP from one vendor, MailDeck is the one of the two that has them.
Setup, API and AI agents
Maildoso is self-serve: a new domain in up to 15 minutes, a mailbox in 5, one-click sync to Instantly, Smartlead and EmailBison, a REST API on every plan and a hosted MCP server. MailDeck's team does the setup with your registrar and sequencer logins; it publishes no API docs and no MCP server.
Warm-up, recipients and domains
Neither runs warm-up itself. MailDeck switches it on in your sequencer; Maildoso asks for 14+ days in an outside tool and up to 80 warm-up emails per mailbox a day. MailDeck puts SMTP warm-up at 3 to 4 weeks before cold email.
Maildoso's terms forbid sending to personal webmail such as Gmail addresses. Its domains are registered to Maildoso while you are a customer and transferred to you on request; MailDeck's are yours from the start.
Refunds
Maildoso's 30-day guarantee pays only when mailboxes fail to send 3+ days in a row through its fault, and it replaces up to 4 domains a year. MailDeck refunds only single-tenant trial users whose mailboxes were not delivered working, and replaces burned domains for free.
Which one to pick
Pick MailDeck if
- You want Outlook tenants or Google Workspace next to your SMTP inboxes
- You want a team to build and load everything for you
- You want domains registered to you from day one
Pick Maildoso if
- You want SMTP volume set up yourself in minutes
- You provision through an API or an AI agent over MCP
- You send only to company addresses
Where Outreach2day fits
We sell cold email mailboxes too, so this section is ours. The comparison above does not rank us.
Outreach2day is SMTP/IMAP too, with what both of these leave out: warm-up for the life of the mailbox and a built-in sequencer, in the $2.50. Each mailbox sends up to 25 cold emails a day, so 1,000 cold emails a day is 40 mailboxes, $100 a month, with no sequencer plan to add.
Like Maildoso we run an MCP server and setup is self-serve. We sell no Outlook or Google accounts, so for those MailDeck is the one of us three to pick.
From 1,000 mailboxes Outreach2day quotes a volume price below the per-mailbox list price of every vendor in our comparisons, including Maildoso's $0.49, with warm-up and sending in the price. Book a call and we quote your volume.
MailDeck vs Maildoso: questions
Is MailDeck cheaper than Maildoso for SMTP?
At 300 inboxes MailDeck lists $150 against Maildoso's $225. At 1,000 they are about level: $500 against $499. Maildoso's inboxes send up to 15 a day; MailDeck's docs say 8 for SMTP.
Does Maildoso sell Outlook or Google inboxes?
No. Maildoso is SMTP only; its Google Workspace product is closed to new mailboxes. MailDeck sells Microsoft 365 tenants and Google Workspace.
Do MailDeck and Maildoso include warm-up?
No. MailDeck switches warm-up on in your sequencer, which runs it. Maildoso asks for 14+ days in an outside tool.
Which has an API and MCP server?
Maildoso has both on every plan. MailDeck lists API access on its Google plans without public docs and has no MCP server.
Are MailDeck's SMTP IPs shared?
MailDeck says each client gets a dedicated IP for private SMTP. Maildoso runs SMTP on its own servers with IP rotation.
Deliverability call
Talk to our deliverability team
Book a call with the people who run our mailbox infrastructure. We look at your current setup and tell you what to change. Running 1,000+ mailboxes? We also quote a volume price below every vendor list price in our comparisons, warm-up and sending included.
- Review your domains, DNS records and current inbox placement
- Size the setup: domains, mailboxes per domain and daily volume per mailbox
- Plan warm-up and the move from your current provider or sequencer
- 1,000+ mailboxes: a volume price per mailbox for your setup
Free call
See open times in your time zone and book on this page.
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Open the booking page insteadMore on MailDeck and Maildoso
- MailDeck reviewPlans, limits, warm-up, API and MCP, support and refunds, with sources
- MailDeck alternativesOptions side by side with prices and mailbox types
- MailDeck vs ScaledMailTwo vendors side by side
- Maildoso reviewPlans, limits, warm-up, API and MCP, support and refunds, with sources
- Maildoso alternativesOptions side by side with prices and mailbox types
- Outreach2day vs MaildosoFeature table and full-setup cost
- Maildoso vs ZapmailTwo vendors side by side
- Maildoso vs InframailTwo vendors side by side
- Maildoso pricing 2026Every plan and what it costs at 25, 100 and 400 mailboxes
- SMTP for Cold Email: Mailbox, Relay or Self-HostedBlog
- Maildoso Pricing 2026: Plans, Add-Ons and Real CostBlog
Sources
Each vendor's own pages. Vendors change prices and plans; if something here is out of date, write to support@outreach2day.com and we will fix it.
MailDeck
- maildeck.co/about
- maildeck.co/legal/terms
- maildeck.co/pricing
- docs.maildeck.co/plans/pricing
- maildeck.co
- maildeck.co/faq
- docs.maildeck.co/domains-dns/domains
- docs.maildeck.co/deliverability/sending-limits
- docs.maildeck.co/deliverability/warmup
- docs.maildeck.co/getting-started/connect-your-sequencer
- docs.maildeck.co/support/getting-help
- maildeck.co/legal/refund
- docs.maildeck.co/getting-started/your-first-order
- maildeck.co/legal/cancellation
- trustpilot.com/review/maildeck.co
- g2.com/products/maildeck/reviews
First cold emails on day 14, full volume on day 21
Add domains, create mailboxes and turn on warm-up. You see every mailbox's warm-up numbers from day one.