Choose Maildoso if you run several hundred mailboxes or more and want the lowest price: as of October 2026, 1,000 Maildoso mailboxes cost $499/mo against $989 on Winnr, and both recommend about 15 cold emails per mailbox per day (Maildoso caps it there). Choose Winnr below about 236 mailboxes (50 cost $69 vs $225 on Maildoso, 200 cost $189 vs $225), or if you want built-in warming, pre-warmed mailboxes, dedicated IPs and domains you buy once.
This page is for people searching for a Maildoso alternative, and for anyone comparing the two before buying. Maildoso changed a lot in 2026: new monthly plans, a 15-emails-per-day limit on every mailbox, a new domain fee, and a move from maildoso.com to maildoso.ai. Everything below reflects what Maildoso's own site says as of October 2026.
What Maildoso offers as of October 2026
- Monthly plans: 30 mailboxes for $75 ($2.50 each), 300 for $225 ($0.75 each) and 1,000 for $499 ($0.49 each). Maildoso dates these prices "as of June 2026". Other sizes can be bought in-app, from $0.49 per mailbox.
- Quarterly plans are now labelled legacy: 32 mailboxes + 8 domains for $299/quarter, 68 + 17 for $499/quarter, and 400 + 100 for $2,199/quarter.
- Sending limit: up to 15 cold emails and 80 warm-up emails per mailbox per day on every plan.
- Domains: not included on monthly plans. The pricing page lists $12/year and notes that registration becomes $15/year from October 1, 2026. You can also connect domains you already own through support or the API.
- Warm-up: at least 14 days is required before the first campaign, using any warm-up provider.
- Infrastructure: Maildoso's own SMTP servers and IPs (not Google Workspace or Azure), with IP rotation, self-healing mailboxes, inbox placement tests every 3 days and per-mailbox health scores. Maildoso says this infrastructure is optimized for B2B outreach and that campaigns to personal providers such as gmail.com may see reduced inbox placement.
- API and MCP access on all plans, and a 30-day money-back guarantee for new users on monthly SMTP packages.
The redirect is worth knowing if you are looking for old links: maildoso.com and getmaildoso.com now forward to maildoso.ai.
Winnr vs Maildoso at a glance
| Winnr | Maildoso | |
|---|---|---|
| Mailbox type | SMTP/IMAP on Winnr's own sending infrastructure | SMTP on Maildoso's own servers and IPs |
| How you pay | Plan: $69 for 50 accounts or $189 for 200, then $1 per extra account | Mailbox licence packs: 30 / 300 / 1,000 for $75 / $225 / $499 |
| Emails per mailbox per day | Up to 50 in total including warming; 10 to 20 of them cold (15 default) | Up to 15 cold plus 80 warm-up |
| Domains | One-time purchase, about $13 for a .com. Bring your own free | $15/year each from Oct 1, 2026 ($12 before). Connect your own |
| Warm-up | Built in, $0.60/mailbox/month | 14 days minimum, bring your own provider |
| Ready-to-send option | Pre-warmed mailboxes, $3/address/month | Not listed on the pricing page |
| Dedicated IP | $20/IP/month on Enterprise | IP rotation; dedicated IPs not listed on the pricing page |
| API | REST API and MCP server | API and MCP server |
| Billing | Monthly, no annual contracts, cancel anytime | Monthly plans; quarterly plans are legacy |
| Money back | 90% deliverability guarantee: refund of your most recent month | 30-day money-back guarantee for new users on monthly packages |
Cost at 50, 200 and 1,000 mailboxes
Monthly subscription only, using each provider's published prices as of October 2026. Domains are extra on both (see the table above).
| Mailboxes | Winnr | Maildoso |
|---|---|---|
| 50 | $69 (Startup) | $225 (300-mailbox plan, the smallest published plan that covers 50; custom sizes are priced in-app) |
| 200 | $189 (Enterprise) | $225 (300-mailbox plan) |
| 1,000 | $989 (Enterprise $189 + 800 × $1) | $499 (1,000-mailbox plan) |
Per mailbox, Maildoso is cheaper once you need a few hundred: $0.49 at 1,000 against Winnr's $0.99. At 50 and 200 mailboxes Winnr is cheaper, because Maildoso's published plans jump from 30 to 300; the two cost the same at 236. If you only need 30 mailboxes, Maildoso's $75 plan is close to Winnr's $69 Startup plan, which gives you 50.
Monthly cost per 1,000 daily cold sends
Maildoso's 15-a-day limit matters less than it first looks. Winnr's own guidance is 10 to 20 cold emails per mailbox per day (15 by default), with up to 50 in total once warming is counted. At the default, a mailbox on either service sends the same 15 cold emails, so cost per email follows the subscription price. The difference is headroom: Winnr mailboxes can go to 20 cold a day, Maildoso's stop at 15.
| Mailboxes | Cold emails/day at 15 each | Winnr | Maildoso |
|---|---|---|---|
| 50 | 750 | $69 ÷ 0.75 = $92.00 | $225 ÷ 0.75 = $300.00 |
| 200 | 3,000 | $189 ÷ 3 = $63.00 | $225 ÷ 3 = $75.00 |
| 1,000 | 15,000 | $989 ÷ 15 = $65.93 | $499 ÷ 15 = $33.27 |
Formula: monthly price ÷ (cold emails per day ÷ 1,000). At 1,000 mailboxes Maildoso is about half Winnr's cost per cold email; its own pricing page publishes the same $33 figure. At 200 and below Winnr is cheaper, because Maildoso's published plans jump from 30 to 300 mailboxes. Running Winnr mailboxes at 20 cold a day, the top of the recommended range, lowers Winnr's figures to $69.00, $47.25 and $49.45.
When Maildoso is the better choice
- You want hundreds or thousands of low-volume mailboxes. At 1,000 mailboxes Maildoso costs about half of Winnr per month.
- 15 cold emails per mailbox per day already fits your plan, so the cap costs you nothing.
- You value the built-in mailbox monitoring: inbox placement tests every 3 days, per-mailbox health scores, and burned mailboxes paused for 14 days automatically.
- You want a 30-day money-back window on your first monthly package.
When Winnr is the better choice
- You need fewer than about 236 mailboxes. Winnr is $69 for 50 and $189 for 200; Maildoso's smallest published plan above 30 is $225 for 300.
- You want headroom. Winnr mailboxes can send 20 cold emails a day when a campaign needs it; Maildoso's stop at 15.
- You want to buy domains once. Winnr domains are a one-time purchase, about $13 for a .com; Maildoso's are $15 a year each. Connecting domains you already own is free on Winnr.
- You need to send this week. Maildoso requires 14 days of warm-up. Winnr's pre-warmed mailboxes are already warmed and cost $3 per address per month with no minimum term.
- You want warming in the same dashboard at $0.60 per mailbox per month instead of a separate tool.
- You want a dedicated IP: $20 per IP per month on Enterprise (how dedicated IPs work).
Both have an API and an MCP server, so automation is not a deciding factor any more. For the full plan breakdown see Winnr pricing, and for how SMTP mailboxes compare with Google and Microsoft inboxes see SMTP for cold email.
Switching from Maildoso to Winnr
Maildoso says domains bought through it stay registered with Maildoso while you use the service, and that it transfers them back to you at no charge at the end of your subscription. Once a domain is yours you can connect it to Winnr for free, create mailboxes on it, and export them to your sequencer (Instantly, Smartlead, EmailBison, PlusVibe and 20+ others). Warm new mailboxes before sending, or start from pre-warmed ones.
Still comparing? See Winnr alternatives for the wider market, or the head-to-heads with Mailforge, Inframail and Mailreef.
Frequently Asked Questions
Is Maildoso cheaper than Winnr?
At large sizes, yes. As of October 2026 Maildoso charges $499/mo for 1,000 mailboxes against $989 on Winnr, and at the same 15 cold emails per mailbox per day that is $33.27 per 1,000 daily cold sends against $65.93. Below about 236 mailboxes Winnr is cheaper: $69 vs $225 at 50 mailboxes, and $189 vs $225 at 200, because Maildoso's published plans jump from 30 to 300 mailboxes.
How many emails per day can a Maildoso mailbox send?
Up to 15 cold emails and 80 warm-up emails per day, according to Maildoso's pricing FAQ as of October 2026. Winnr recommends 10 to 20 cold emails per mailbox per day (15 by default) and up to 50 in total including warming, so at the default the two send the same number of cold emails per mailbox.
Does Maildoso use Google Workspace?
No. Maildoso sells SMTP mailboxes on its own servers and IPs, not Google Workspace or Azure. Winnr is also SMTP/IMAP on its own sending infrastructure. If you specifically want Google Workspace inboxes, neither is the right product.
Are domains included with Maildoso?
Only on the legacy quarterly plans. On monthly plans you buy domains separately ($12/year, rising to $15/year from October 1, 2026) or connect domains you own. Winnr domains are a one-time purchase (about $13 for a .com), and connecting your own domains is free.
Does Maildoso have an API?
Yes. As of October 2026 Maildoso includes API and MCP access on all plans. Winnr also has a full REST API and an MCP server, so both can be automated.
About this comparison. Winnr publishes this page. Competitor prices and features were checked on the providers' own sites on October 6, 2026: maildoso.ai/pricing (plans, limits, domain fees and FAQ). Prices are in USD, before tax and domains unless stated. If something here is out of date, email info@winnr.app and we will correct it.