Maildoso alternatives: SMTP, Google and Microsoft mailboxes, priced with warmup and a sender

Maildoso sells SMTP mailboxes on its own servers and IPs, $2.50 each on its 30-mailbox plan ($75 a month), and syncs them to Instantly, Smartlead and EmailBison. Warmup and sending come from those tools: Maildoso asks for at least 14 days of warmup from another provider or the Instantly pool before the first campaign. The seven options below, Outreach2day first because we make it, are priced with warmup and a sequencer at 25, 100 and 400 mailboxes.

Create mailboxesBook a call
  • Warmup and sending included
  • $2.50 a mailbox, 12 minimum
  • Month-to-month billing

Full setup · 100 mailboxes · 55,000 emails a month

$264.50less a month with Outreach2day, $3,174 a year

Outreach2day$250 / mo
Maildoso + Instantly$514.50 / mo

Mailboxes, warmup and a sequencer at list prices, monthly billing. Line items in the cost table below.

teams have used Outreach2day
3,600+
emails sent a day
40M+

Among them

  • SalesSourcers
  • Vivid
  • OptiQ.AI
  • SLSBMB
  • Outreacher
  • Outpush

Why Outreach2day tops this list

  • Warmup from day one

    Maildoso leaves warmup to outside tools; ours starts on day one and runs for the life of the mailbox

  • Sequencer included

    Campaigns, sequences and a reply inbox are in the $2.50

  • Up to 25 a day per mailbox

    Maildoso caps mailboxes at 15 cold emails a day; we recommend up to 25

Maildoso runs inbox placement tests every 3 days and gives each mailbox a health score, for teams that already pay for warmup and a sequencer.

7 Maildoso alternatives, ranked

Options outside the cost table below show their full setup at 100 mailboxes here.

  1. 1. Outreach2day: the same SMTP mailbox with warmup and sending running

    The same kind of mailbox as Maildoso, SMTP/IMAP on your domains at $2.50, with the two things Maildoso leaves out already running: warmup and a sequencer. Each of ours is planned for up to 25 cold emails a day, where Maildoso sets 15, so the same volume needs fewer mailboxes. source

    Warmup includedSending included

  2. 2. Mailforge: shared-IP SMTP slots with Forge warmup

    Another SMTP seller on shared infrastructure, billed per slot: $3 a month up to 110 slots, falling by $0.10 per 100 add-on slots to $2. Like Maildoso it sells mailboxes only; the Forge family adds warmup as Warmforge and sending as Salesforge. source (opens the vendor's page in a new tab)

    Warmup extra or partialSending not included

  3. 3. Zapmail: moving from SMTP to Google or Microsoft

    Pick Zapmail if leaving Maildoso means leaving SMTP: Google Workspace and Microsoft 365 mailboxes from $39 for 10, with warmup handled per its FAQ and domains that stay yours. Sending still needs a sequencer. source (opens the vendor's page in a new tab)

    Warmup includedSending not included

  4. 4. InboxKit: Google or Microsoft mailboxes below 30

    Google or Microsoft mailboxes at $3 a month each with no minimum, where Maildoso's plan starts at 30. Warmup is a $3 add-on, and you keep your sequencer. source (opens the vendor's page in a new tab)

    Warmup extra or partialSending not included

  5. 5. Premium Inboxes: inboxes built and uploaded for you

    For teams that want people to build the inboxes: Google and Microsoft, DNS checked by hand, delivered into the sequencer Maildoso syncs to today, with flagged inboxes replaced for free. $3.50 per inbox under 250. source (opens the vendor's page in a new tab)

    Warmup extra or partialSending not includedFull setup at 100 mailboxes: $447 / mo

  6. 6. Instantly: accounts bought inside the Instantly you sync to

    If you sync Maildoso mailboxes into Instantly today, Instantly can also sell the accounts: done-for-you Google accounts at $5 and AirMail SMTP inboxes at $4 a month, tied to your Instantly workspace. source (opens the vendor's page in a new tab)

    Warmup includedSending extra or partialFull setup at 100 mailboxes: $597 / mo

  7. 7. Smartlead: mailboxes bought inside the Smartlead you sync to

    If you sync into Smartlead today, SmartSenders sells Google and Outlook mailboxes at $4.50 and SMTP from $3.99, usable only inside Smartlead. source (opens the vendor's page in a new tab)

    Warmup includedSending extra or partialFull setup at 100 mailboxes: $544 / mo

Maildoso and more options side by side

Maildoso's closest competitors are other SMTP vendors. Lowest published per-mailbox price, smallest order, warmup, API and MCP for each, from their own pages in October 2026.

Outreach2day fits if

  • You run 1,000+ mailboxes: we quote a volume price below every vendor list price in our comparisons, warmup and sending included
  • You want 25 cold emails per mailbox a day instead of Maildoso's 15
  • You want warmup and a sequencer without paying for a third-party warmup pool and a separate sequencer
  • You need 12 to 30 mailboxes and Maildoso's smallest pack is 30

Outreach2day does not fit if

  • You run 300+ SMTP mailboxes and already pay for warmup and sending; Maildoso's $0.75 and $0.49 packs cost less
  • You need Google Workspace or Microsoft 365 mailboxes
  • You want IP rotation managed across a large shared pool

Maildoso: pricing, limits and who it fits

From Maildoso's own pages, read .

Pricing model
Monthly plans by mailbox count, starting at 30 mailboxes for $75 ($2.50 each). Quarterly plans that bundle domains are marked legacy.source (opens the vendor's page in a new tab)
Domains
$12 a year, $15 from October 1, 2026; included only in the legacy quarterly plans. Domains bought through Maildoso are registered to and managed by Maildoso while it services them; transfer out is free on request.source (opens the vendor's page in a new tab)
Sending limits
Up to 15 cold emails and 80 warmup emails per mailbox a day. Up to 99 mailboxes per domain, 8 recommended. Built for B2B; campaigns to personal addresses are discouraged.source (opens the vendor's page in a new tab)
Mailbox type
SMTP only, on Maildoso's own servers and IPs with IP rotation. Mailboxes that burn out are pulled from campaigns for 14 days to recover.source (opens the vendor's page in a new tab)
Warmup
Not supplied. Maildoso asks for at least 14 days of warmup from another provider or the Instantly warmup pool, kept on for the life of the mailbox.source (opens the vendor's page in a new tab)
Refunds
Only when mailboxes fail to send for 3 or more consecutive days through Maildoso's fault, within 30 days of the first payment. Domains are never refunded.source (opens the vendor's page in a new tab)

What Maildoso is good at

Pick Maildoso if

  • You already pay for a sequencer with warmup and need more SMTP mailboxes to plug into it

What the full setup costs each month

Mailboxes, warmup and a sequencer at the same email volume, every line item listed. Set your volume.

Outreach2day, mailboxes/ moWarmup, sending, the inbox and analytics included.
Create 100 mailboxes

The same volume elsewhere

  • Outreach2day
    Mailboxes with warmup and a sequencer included
  • Maildoso more
    mailboxes: $2.50 each, Maildoso's price per mailbox on its 30-mailbox plan ($75 a month); up to 15 cold emails per mailbox a day, so we count the mailboxes needed for the same email volume; sequencer with warmup: Instantly Growth $47 (5,000 emails), Hypergrowth $97 (125,000 emails), Hypergrowth + add-on $184 (250,000 emails), Light Speed $358 (500,000 emails) a month

  • Outreach2dayMailboxes + warmup + sequencer

    25 mailboxes
    $62.50 / mo25 mailboxes × $2.50, warmup and a sequencer included $62.50
    100 mailboxes
    $250 / mo100 mailboxes × $2.50, warmup and a sequencer included $250
    400 mailboxes
    $1,000 / mo400 mailboxes × $2.50, warmup and a sequencer included $1,000

  • MailforgeMailboxes

    25 mailboxes
    $172 / moMailforge 25 slots $75 + Instantly Hypergrowth $97
    100 mailboxes
    $397 / moMailforge 100 slots $300 + Instantly Hypergrowth $97
    400 mailboxes
    $1,267 / moMailforge 400 slots $1,083 + Instantly Hypergrowth + add-on $184

  • ZapmailMailboxes

    25 mailboxes
    $188.50 / moZapmail Starter + 15 extra mailboxes $91.50 + Instantly Hypergrowth $97
    100 mailboxes
    $396 / moZapmail Pro (100 mailboxes) $299 + Instantly Hypergrowth $97
    400 mailboxes
    $1,383 / moZapmail Pro + 300 extra mailboxes $1,199 + Instantly Hypergrowth + add-on $184

  • InboxKitMailboxes

    25 mailboxes
    $172 / mo25 mailboxes × $3.00 $75 + Instantly Hypergrowth $97
    100 mailboxes
    $397 / mo100 mailboxes × $3.00 $300 + Instantly Hypergrowth $97
    400 mailboxes
    $1,384 / mo400 mailboxes × $3.00 $1,200 + Instantly Hypergrowth + add-on $184

  • MaildosoMailboxes

    25 mailboxes
    $202 / mo42 Maildoso mailboxes × $2.50 (the number needed at 15 a day) $105 + Instantly Hypergrowth $97
    100 mailboxes
    $514.50 / mo167 Maildoso mailboxes × $2.50 (the number needed at 15 a day) $417.50 + Instantly Hypergrowth $97
    400 mailboxes
    $1,851.50 / mo667 Maildoso mailboxes × $2.50 (the number needed at 15 a day) $1,667.50 + Instantly Hypergrowth + add-on $184

How we count: 550 cold emails per mailbox a month (25 a day on 22 working days), the same for every vendor. List prices on monthly billing, in USD, excluding domains, taxes and discounts. A vendor that does not sell sending gets the cheapest Instantly plan that covers the volume.

Included in the $2.50

Everything a cold email setup needs, in one mailbox price

One subscription at $2.50 a mailbox, from 12 mailboxes ($30 a month), everything included

  • Sequencer included

    Warmup and a sequencer

    • Warmup for the life of every mailbox
    • Campaigns, sequences, schedules and follow-ups
    • One inbox for replies from all mailboxes
  • Per mailbox

    Analytics that show which mailboxes still land

    • Warmup inbox, spam and bounce rate for every mailbox
    • Sends by recipient provider
    • Google and Outlook placement tests
  • Deliverability

    SSL domain masking and link protection

    SSL domain masking on sending domains and automatic link replacement in emails; SPF, DKIM, DMARC and redirect to your site set up automatically

  • REST API

    An API on every account

    Script domains, DNS and warmup, or pull mailbox data into your own tools

    curl · public.outreach2day.com
    # OUTREACH2DAY_API_KEY: a key from app → API keyscurl "https://public.outreach2day.com/warmup/mailboxes?workspaceId=123" \  -H "Authorization: Bearer $OUTREACH2DAY_API_KEY"
  • MCP server

    Run it from Claude, Cursor or Codex

    Your AI assistant checks domains, quotes mailboxes and sets up DNS, warmup and campaigns. Add the server URL to Claude, ChatGPT, Cursor or Codex and sign in with your Outreach2day account; turn on Prepare orders at sign-in, then approve and pay on Stripe

    Server URL
    https://public.outreach2day.com/mcp
    Or install for every client · macOS / Linux
    curl -fsSL https://outreach2day.com/install | sh
    Setup for each client
  • 14 tools

    Keep the sequencer you already use

    Instantly and Smartlead sync by API key; 12 more get a CSV in their own import format. Setup per tool

    • Instantly
    • Smartlead
    • SalesHandy
    • Reply.io
    • Apollo
    • Snov.io
    • Mailshake
    • ReachInbox
    • PlusVibe
    • Luna
    • Nureply
    • Coldy
    • MailToaster
    • EmailBison
  • Hundreds of mailboxes

    Enterprise support

    A shared Slack channel and a dedicated account team, for companies running hundreds or thousands of mailboxes

    Talk to us

The details

What a Maildoso setup needs besides the mailbox

A Maildoso mailbox is $2.50 on the 30-mailbox plan ($75 a month). The setup needs two more tools: warmup, which Maildoso asks you to run for at least 14 days before the first campaign and keep on for the life of the mailbox, and a sequencer. Maildoso syncs to Instantly, Smartlead and EmailBison and exports CSV for 9 sequencers.

Instantly's plans include warmup, so our cost table pairs Maildoso with the cheapest Instantly plan for the volume: Hypergrowth at $97 a month for 100 of our mailboxes. If you send from another tool, replace that line with its price.

Maildoso's plan, limits and refund terms: Maildoso pricing 2026. Maildoso and Outreach2day compared fact by fact: Outreach2day vs Maildoso.

Daily limits and mailboxes per domain

Maildoso's pricing page sets up to 15 cold and 80 warmup emails per mailbox a day and allows up to 99 mailboxes on a domain, 8 recommended. It is built for B2B and discourages campaigns to personal addresses.

We plan each mailbox for up to 25 cold emails a day and put up to 5 mailboxes on a domain. The cold volume of 100 of our mailboxes (20 domains) takes 167 Maildoso mailboxes, 21 domains at 8 a domain.

Replacing a burned mailbox

Maildoso pulls a mailbox that burns out from campaigns for 14 days to recover, and you can delete and recreate a mailbox in its slot at no extra cost.

With us, you delete the mailboxes of a burned domain and reuse the slots on a new domain at no extra mailbox cost. The new mailboxes warm up for 14 days before cold sending.

Who holds the domains

Domains bought through Maildoso cost $15 a year from October 1, 2026 ($12 before). Maildoso registers and manages them while it services them, and its terms say it transfers them out free on request.

Domains bought in Outreach2day are registered to you: $13 a year for a .com, $5 for a .info. Zapmail's domains belong to the buyer, and Mailforge supports transfers in and out. Instantly keeps the domains of its done-for-you accounts, and SmartSenders domains expire after 12 months.

Pick by the tool you send from

Instantly: keep it and connect our mailboxes with an API key, or buy Instantly's own accounts inside it.

Smartlead: the same two choices, with SmartSenders as Smartlead's own mailboxes.

EmailBison or another sequencer: our mailboxes export as a CSV in the import format of 14 tools, EmailBison among them. Zapmail exports to 50+ tools and InboxKit to 24+.

No sequencer yet: Outreach2day is the one option on this list with sending in the mailbox price.

Customers

What customers say

  • “That was the best infrastructure and value for money I saw.”
    Ido RebhunIdo RebhunRenaissance
  • “…deliverability with your inboxes is better than our outlook/google inboxes…”
    Daniel DultsinDaniel DultsinControl
  • “We really would like to thank you for that report. We don’t know what we are doing with email and it is very reassuring to us to know we have a partner on top of the ball.”
    ReilcapBill OConnorReilcap

Switching from Maildoso

  1. Create SMTP/IMAP mailboxes in Outreach2day, the same type as Maildoso's, on new domains bought in the app
  2. Warmup runs from the first day; the Maildoso mailboxes keep sending while ours wait out the 14 days
  3. Start cold sending on the new mailboxes at day 14 and move the full volume over by day 21
  4. Keep your sequencer (Instantly and Smartlead connect with an API key, EmailBison takes a CSV) or send from our own sequencer
  5. Cancel Maildoso and ask for your domains; Maildoso says the transfer is free at the end of the subscription

Maildoso alternatives: questions

What is the cheapest Maildoso alternative?

Outreach2day, priced for the same cold volume: $250 a month for 100 mailboxes with warmup and sending. Maildoso with an Instantly plan for warmup and sending comes to $514.50.

Which Maildoso alternatives include warmup?

Outreach2day, Zapmail, Instantly and Smartlead. InboxKit sells it as a $3 add-on; Mailforge sells it as Warmforge.

Does any Maildoso alternative sell Google Workspace mailboxes?

Yes: Zapmail, InboxKit and Premium Inboxes sell Google Workspace and Microsoft 365, Instantly sells Google accounts, and Smartlead resells Google mailboxes as SmartSenders. Maildoso's Google Workspace page says it is not offering new Google Workspace mailboxes at the moment.

Can I keep my sequencer if I leave Maildoso?

Yes. Instantly and Smartlead connect to our mailboxes with an API key, and EmailBison is one of 12 more tools that get a CSV in their own import format. Our warmup keeps running while your sequencer sends.

Can I take my domains with me when I leave Maildoso?

Yes. Maildoso registers the domains it sells and manages them while it services them; its pricing page says it transfers them at no charge at the end of the subscription.

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, warmup 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 warmup 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.

Or open the booking page

More comparisons and guides

Sources

Checked . Vendors change prices and plans; if something here is out of date, write to support@outreach2day.com and we will fix it.

First cold emails on day 14, full volume on day 21

Add domains, create mailboxes and turn on warmup. You see every mailbox's warmup numbers from day one.

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