Puzzle Inbox alternatives: 7 priced at 2,500 cold emails a day against its $0.35 Outlook inbox

Puzzle Inbox sells Outlook 365 inboxes at $0.35 a month and Google Workspace at $3, or pre-warmed at $0.50 and $4.50, and caps them at 3 and 12 cold emails an inbox a day. For 2,500 cold emails a day that is 834 Outlook inboxes: $388.90 a month with Instantly, before the domains you buy yourself. 100 Outreach2day mailboxes send the same 2,500 a day for $171.67 with warmup, our sequencer and domains. We make Outreach2day and list it first.

Price 100 mailboxes1,000+ mailboxes? Book a call
  • Warmup and sending included
  • $2.50 a mailbox, 12 minimum
  • Month-to-month billing

Full setup · 2,500 cold emails a day

USD a month
  1. Outreach2dayOutreach2day: $171.67
  2. InboxKitInboxKit: from $286
  3. Puzzle InboxPuzzle Inbox: from $388.90
  4. LiteMailLiteMail: $419
  5. ZapmailZapmail: $432.83
  6. PrimeforgePrimeforge: $507.67
  7. HypertideHypertide: from $597
  8. Cheap InboxesCheap Inboxes: $686.37
Mailboxes, domains and the sequencer each one needs to send, at list prices. Line items and sources

Ranked

Why each one is a Puzzle Inbox alternative

We make Outreach2day and list it first.

  1. 1. Outreach2day: 25 a day per mailbox with warmup and a sequencer in the price

    Mailboxes on our own infrastructure with warmup for the life of the mailbox and our sequencer in $2.50, $1.50 from 100 and $0.50 from 1,000, month to month from 12; up to 25 cold emails a mailbox a day from day 14, eight times Puzzle Inbox's Outlook cap.

    Per mailbox a month

    from $0.50

    1,000+ mailboxes

  2. 2. InboxKit: Google or Microsoft at a flat rate

    Google Workspace, Microsoft 365 and Azure-tenant mailboxes at a flat $3 a month from one mailbox; its guides plan 40 to 50 emails per mailbox a day. Warmup is a $3 add-on, and there is a REST API.

    InboxKit reviewInboxKit alternatives

    Per mailbox a month

    from $3

  3. 3. LiteMail: self-serve Google and Microsoft plans

    Google Workspace and Microsoft 365 inboxes at $37 for 10 up to $849 for 300, 25 emails an inbox a day, with an API and OAuth export to Instantly and Smartlead. Pre-warmed inboxes cost more, and nothing is refunded.

    LiteMail reviewLiteMail alternatives

    Per mailbox a month

    from $2.83

    Scale, 300 inboxes

  4. 4. Zapmail: Google and Microsoft with warmup handled

    Google Workspace or Microsoft 365 on US or EU IPs at $39 for 10, $99 for 30 and $299 for 100, with warmup handled per its FAQ, pre-warmed mailboxes and a hosted MCP server.

    Zapmail reviewZapmail alternatives

    Per mailbox a month

    from $2.99

    Pro, monthly

  5. 5. Hypertide: Outlook priced per domain

    The closest Outlook match: Microsoft Entra inboxes at $25 a domain of 25 ($1 each), about 5 sends an inbox a day on its Entra page, plus Google at $3.30. Checkout takes a $500 credit up front.

    Hypertide reviewHypertide alternatives

    Per mailbox a month

    from $1

    Entra, $25 per domain of 25

  6. 6. Primeforge: Google and Microsoft from the Forge stack

    Google Workspace and Microsoft 365 slots at $4.50 a month on small orders, $3.50 above 1,000, at 30 emails per mailbox a day, with a public API. Warmup is Warmforge, sold separately.

    Primeforge reviewPrimeforge alternatives

    Per mailbox a month

    from $3.50

    monthly, 1,000+ slots

  7. 7. Cheap Inboxes: Google with admin access

    Google Workspace with admin access and Microsoft 365, one domain per workspace, $3.50 a mailbox under 100 down to $2.80 above 1,000, at 15 emails a day in its calculator, with an API and a hosted MCP server.

    Cheap Inboxes reviewCheap Inboxes alternatives

    Per mailbox a month

    from $2.80

    1,000+ mailboxes

Side by side

Puzzle Inbox and 7 alternatives side by side

Lowest published per-mailbox price, smallest order, mailbox types, warmup, API and MCP. Each cell links its source.

List prices from Outreach2day's pricing page, InboxKit's pricing page, LiteMail's pricing page, Zapmail's pricing page, Hypertide's pricing page, Primeforge's pricing page, Cheap Inboxes's pricing page and Puzzle Inbox's pricing page, checked . Taxes and card fees excluded.

Cost

What 2,500 cold emails a day cost with each option

The same emails a day for every option: each vendor's mailboxes at its own sending limit, its domains and the sequencer they need, at list prices.

2,500 a day · 55,000 a monthMailboxes, domains and the sequencer · USD a month
  1. Outreach2dayOutreach2day: $171.67
  2. InboxKitInboxKit: from $286
  3. Puzzle InboxPuzzle Inbox: from $388.90
  4. LiteMailLiteMail: $419
  5. ZapmailZapmail: $432.83
  6. PrimeforgePrimeforge: $507.67
  7. HypertideHypertide: from $597
  8. Cheap InboxesCheap Inboxes: $686.37
Per 1,000 cold emailsThe same total per 1,000 of the 55,000 emails a month · USD
  1. Outreach2dayOutreach2day: $3.12
  2. InboxKitInboxKit: from $5.20
  3. Puzzle InboxPuzzle Inbox: from $7.07
  4. LiteMailLiteMail: $7.62
  5. ZapmailZapmail: $7.87
  6. PrimeforgePrimeforge: $9.23
  7. HypertideHypertide: from $10.85
  8. Cheap InboxesCheap Inboxes: $12.48
Outreach2day all-in100 mailboxes · 25 cold emails a day each, warmup and our sequencer included$171.67 a month$3.12 per 1,000 emails · 100 mailboxes for 2,500 emails a day
  • 100 mailboxes at $1.50 (volume price from 100), warmup and sequencer included: $150
  • 20 domains at $13 a year: $21.67
InboxKit + Instantly63 Google or Microsoft mailboxes · 40 cold emails a day eachfrom $286 a monthfrom $5.20 per 1,000 emails · 63 mailboxes for 2,500 emails a day
LiteMail + Instantly100 Google Workspace mailboxes · 25 cold emails a day each$419 a month$7.62 per 1,000 emails · 100 mailboxes for 2,500 emails a day
Zapmail + Instantly100 Google or Microsoft mailboxes · 25 cold emails a day each$432.83 a month$7.87 per 1,000 emails · 100 mailboxes for 2,500 emails a day
Hypertide + Instantly500 Microsoft Entra (Outlook) mailboxes · 5 cold emails a day eachfrom $597 a monthfrom $10.85 per 1,000 emails · 500 mailboxes for 2,500 emails a day
Primeforge + Instantly84 Google or Microsoft mailboxes · 30 cold emails a day each$507.67 a month$9.23 per 1,000 emails · 84 mailboxes for 2,500 emails a day
Cheap Inboxes + Instantly167 Google or Microsoft mailboxes · 15 cold emails a day each$686.37 a month$12.48 per 1,000 emails · 167 mailboxes for 2,500 emails a day
Puzzle Inbox + Instantly834 Outlook 365 Standard mailboxes · 3 cold emails a day eachfrom $388.90 a monthfrom $7.07 per 1,000 emails · 834 mailboxes for 2,500 emails a day

Compared at the same emails a day, each vendor at its own published emails per mailbox a day: a cheap mailbox that sends 5 a day costs more per email than one that sends 25. Every option at 2,500 a day · 55,000 a month (22 sending days). Puzzle Inbox and its alternatives at the same mailbox count. Mailboxes = emails a day ÷ each vendor's emails per mailbox a day; monthly list prices on monthly billing, with the cheapest plan of the sequencer named in each row that covers the volume (Instantly unless the vendor's mailboxes need another; both include warmup). Domains at each vendor's published price spread over 12 months; "from" means a domain price is not published. A mailbox-only vendor cannot send campaigns on its own, so its total is the full sending setup: its mailboxes, domains and the sequencer plan that covers the volume. Instantly is the reference sequencer, on its published plans for the emails and new contacts a month (emails ÷ 3); Smartlead where Instantly publishes no plan; Mailforge with Salesforge, because its mailboxes cannot be warmed in Instantly. The mailbox line is listed on its own in every cell.

Your saving · 2,500 a day

You save $217.23 a month ($2,607 a year)with Outreach2day at 2,500 cold emails a day, against Puzzle Inbox + Instantly at list prices

We move your mailboxes and campaigns for you, free

New · Outreach2day volume pricing

The mailbox price falls from 100 and again from 1,000 mailboxes

Warmup, the sequencer and the replies inbox included at every tier

  1. Up to 99 mailboxes$2.50a mailbox a month
  2. From 100 mailboxes$1.50a mailbox a month
  3. From 1,000 mailboxes$0.50a mailbox a month

Enterprise plan. Better prices for larger volumes.

Book a call

Emails per mailbox

Each Outreach2day mailbox sends 25 cold emails a day from day 14, Puzzle Inbox's 3: 8.33× the volume per mailbox

Outreach2day, full setup per 1,000 emails
$3.12
All in: $171.67 a month, sequencer and warmup included. Mailboxes alone: $1.50 ÷ (25 × 22) = $2.73
Puzzle Inbox, full setup per 1,000 emails
from $7.07
With Instantly Hypergrowth: from $388.90 a month. Mailboxes alone: $0.35 ÷ (3 × 22) = $5.30

2,500 cold emails a day (834 Puzzle Inbox mailboxes, 100 of ours), 22 sending days. Puzzle Inbox sells mailboxes only, so its full setup adds the sequencer that sends them; every line is in the cost table.

Cold emails a mailbox a day
  1. Outreach2dayOutreach2day: 25 a day
  2. Puzzle InboxPuzzle Inbox: 3 a day

At scale

From 25,000 to 1,000,000 cold emails a day

The same setups at larger daily volumes. A vendor without a published price at a size reads “Custom pricing (not published)” and has no bar.

Running 25,000+ a day? Enterprise plan: better prices for larger volumes.Book a call

25,000 a day · 550,000 a month1,000 mailboxes · USD a month
  1. Outreach2day all-inOutreach2day all-in: $716.67
  2. LiteMail + InstantlyLiteMail + Instantly: $3,800
  3. Zapmail + InstantlyZapmail + Instantly: $4,066.83
  4. Hypertide + InstantlyHypertide + Instantly: from $5,706
  5. Primeforge + InstantlyPrimeforge + Instantly: $4,124.13
  6. Cheap Inboxes + InstantlyCheap Inboxes + Instantly: $5,836.47
  7. Puzzle Inbox + InstantlyPuzzle Inbox + Instantly: from $3,622.90
InboxKit + Instantly: no published price at this volume, so no bar.
50,000 a day · 1,100,000 a month2,000 mailboxes · USD a month
  1. Outreach2day all-inOutreach2day all-in: $1,433.33
  2. LiteMail + InstantlyLiteMail + Instantly: $7,509
  3. Zapmail + InstantlyZapmail + Instantly: $8,036.58
  4. Hypertide + InstantlyHypertide + Instantly: from $11,315
  5. Primeforge + InstantlyPrimeforge + Instantly: $7,808.17
  6. Cheap Inboxes + InstantlyCheap Inboxes + Instantly: $11,575.94
  7. Puzzle Inbox + InstantlyPuzzle Inbox + Instantly: from $7,148.45
InboxKit + Instantly: no published price at this volume, so no bar.
100,000 a day · 2,200,000 a month4,000 mailboxes · USD a month
  1. Outreach2day all-inOutreach2day all-in: $2,866.67
  2. LiteMail + InstantlyLiteMail + Instantly: $15,014
  3. Zapmail + InstantlyZapmail + Instantly: $16,064.17
  4. Hypertide + InstantlyHypertide + Instantly: from $22,620
  5. Primeforge + InstantlyPrimeforge + Instantly: $15,596.33
  6. Cheap Inboxes + InstantlyCheap Inboxes + Instantly: $23,138.25
  7. Puzzle Inbox + InstantlyPuzzle Inbox + Instantly: from $14,286.90
InboxKit + Instantly: no published price at this volume, so no bar.
250,000 a day · 5,500,000 a month10,000 mailboxes · USD a month
  1. Outreach2day all-inOutreach2day all-in: $7,166.67
InboxKit + Instantly, LiteMail + Instantly, Zapmail + Instantly, Hypertide + Instantly, Primeforge + Instantly, Cheap Inboxes + Instantly, Puzzle Inbox + Instantly: no published price at this volume, so no bar.
500,000 a day · 11,000,000 a month20,000 mailboxes · USD a month
  1. Outreach2day all-inOutreach2day all-in: $14,333.33
InboxKit + Instantly, LiteMail + Instantly, Zapmail + Instantly, Hypertide + Instantly, Primeforge + Instantly, Cheap Inboxes + Instantly, Puzzle Inbox + Instantly: no published price at this volume, so no bar.
1,000,000 a day · 22,000,000 a month40,000 mailboxes · USD a month
  1. Outreach2day all-inOutreach2day all-in: $28,666.67
InboxKit + Instantly, LiteMail + Instantly, Zapmail + Instantly, Hypertide + Instantly, Primeforge + Instantly, Cheap Inboxes + Instantly, Puzzle Inbox + Instantly: no published price at this volume, so no bar.
Monthly cost of Puzzle Inbox and its alternatives from 25,000 to 1,000,000 cold emails a day
Setup25,000 a day550,000 a month1,000 mailboxes50,000 a day1,100,000 a month2,000 mailboxes100,000 a day2,200,000 a month4,000 mailboxes250,000 a day5,500,000 a month10,000 mailboxes500,000 a day11,000,000 a month20,000 mailboxes1,000,000 a day22,000,000 a month40,000 mailboxes
Outreach2day all-in$716.67$1,433.33$2,866.67$7,166.67$14,333.33$28,666.67
InboxKit + InstantlyCustom pricing (not published)Custom pricing (not published)Custom pricing (not published)Custom pricing (not published)Custom pricing (not published)Custom pricing (not published)
LiteMail + Instantly$3,800$3,083.33 more$7,509$6,075.67 more$15,014$12,147.33 moreCustom pricing (not published)Custom pricing (not published)Custom pricing (not published)
Zapmail + Instantly$4,066.83$3,350.16 more$8,036.58$6,603.25 more$16,064.17$13,197.50 moreCustom pricing (not published)Custom pricing (not published)Custom pricing (not published)
Hypertide + Instantlyfrom $5,706$4,989.33 morefrom $11,315$9,881.67 morefrom $22,620$19,753.33 moreCustom pricing (not published)Custom pricing (not published)Custom pricing (not published)
Primeforge + Instantly$4,124.13$3,407.46 more$7,808.17$6,374.84 more$15,596.33$12,729.66 moreCustom pricing (not published)Custom pricing (not published)Custom pricing (not published)
Cheap Inboxes + Instantly$5,836.47$5,119.80 more$11,575.94$10,142.61 more$23,138.25$20,271.58 moreCustom pricing (not published)Custom pricing (not published)Custom pricing (not published)
Puzzle Inbox + Instantlyfrom $3,622.90$2,906.23 morefrom $7,148.45$5,715.12 morefrom $14,286.90$11,420.23 moreCustom pricing (not published)Custom pricing (not published)Custom pricing (not published)

Outreach2day: 25 cold emails per mailbox a day, 5 mailboxes per domain, .com domains at $13 a year (1,000 mailboxes and 200 domains at 25,000 a day; 40,000 and 8,000 at 1,000,000). Instantly and Smartlead with the accounts they sell, at the published plan for the volume; mailbox vendors at their own emails-per-mailbox limit with their domains and the Instantly (Mailforge: Salesforge) plan for the volume. A month is 22 sending days, so emails a month = emails a day × 22. Where a vendor publishes no price at that size the cell says so and the chart leaves it out. At this size the main table's flat $2.50 a Maildoso mailbox gives way to its published packs.

Every line at scale

  • Outreach2day all-in, 25,000 a day: 1,000 mailboxes at $0.50 (volume price from 1,000), warmup and sequencer included ($500) + 200 domains at $13 a year ($216.67) = $716.67
  • Outreach2day all-in, 50,000 a day: 2,000 mailboxes at $0.50 (volume price from 1,000), warmup and sequencer included ($1,000) + 400 domains at $13 a year ($433.33) = $1,433.33
  • Outreach2day all-in, 100,000 a day: 4,000 mailboxes at $0.50 (volume price from 1,000), warmup and sequencer included ($2,000) + 800 domains at $13 a year ($866.67) = $2,866.67
  • Outreach2day all-in, 250,000 a day: 10,000 mailboxes at $0.50 (volume price from 1,000), warmup and sequencer included ($5,000) + 2,000 domains at $13 a year ($2,166.67) = $7,166.67
  • Outreach2day all-in, 500,000 a day: 20,000 mailboxes at $0.50 (volume price from 1,000), warmup and sequencer included ($10,000) + 4,000 domains at $13 a year ($4,333.33) = $14,333.33
  • Outreach2day all-in, 1,000,000 a day: 40,000 mailboxes at $0.50 (volume price from 1,000), warmup and sequencer included ($20,000) + 8,000 domains at $13 a year ($8,666.67) = $28,666.67
  • LiteMail + Instantly, 25,000 a day: Scale ($849 for 300) + 700 at $2.85 ($2,844) source (opens the vendor's page in a new tab) + 200 domains at $15 a year ($250) + Instantly Hypergrowth + 7 Outbound add-ons (sequencer, warmup) ($706) = $3,800
  • LiteMail + Instantly, 50,000 a day: Scale ($849 for 300) + 1700 at $2.85 ($5,694) source (opens the vendor's page in a new tab) + 400 domains at $15 a year ($500) + Instantly Hypergrowth + 14 Outbound add-ons (sequencer, warmup) ($1,315) = $7,509
  • LiteMail + Instantly, 100,000 a day: Scale ($849 for 300) + 3700 at $2.85 ($11,394) source (opens the vendor's page in a new tab) + 800 domains at $15 a year ($1,000) + Instantly Hypergrowth + 29 Outbound add-ons (sequencer, warmup) ($2,620) = $15,014
  • Zapmail + Instantly, 25,000 a day: Pro + 900 extra mailboxes ($2,999) source (opens the vendor's page in a new tab) + 334 domains at $13 a year ($361.83) + Instantly Hypergrowth + 7 Outbound add-ons (sequencer, warmup) ($706) = $4,066.83
  • Zapmail + Instantly, 50,000 a day: Pro + 1900 extra mailboxes ($5,999) source (opens the vendor's page in a new tab) + 667 domains at $13 a year ($722.58) + Instantly Hypergrowth + 14 Outbound add-ons (sequencer, warmup) ($1,315) = $8,036.58
  • Zapmail + Instantly, 100,000 a day: Pro + 3900 extra mailboxes ($11,999) source (opens the vendor's page in a new tab) + 1,334 domains at $13 a year ($1,445.17) + Instantly Hypergrowth + 29 Outbound add-ons (sequencer, warmup) ($2,620) = $16,064.17
  • Hypertide + Instantly, 25,000 a day: 200 Entra domains of 25 inboxes at $25 ($5,000) source (opens the vendor's page in a new tab) + 200 domains, price not published (not published) + Instantly Hypergrowth + 7 Outbound add-ons (sequencer, warmup) ($706) = from $5,706
  • Hypertide + Instantly, 50,000 a day: 400 Entra domains of 25 inboxes at $25 ($10,000) source (opens the vendor's page in a new tab) + 400 domains, price not published (not published) + Instantly Hypergrowth + 14 Outbound add-ons (sequencer, warmup) ($1,315) = from $11,315
  • Hypertide + Instantly, 100,000 a day: 800 Entra domains of 25 inboxes at $25 ($20,000) source (opens the vendor's page in a new tab) + 800 domains, price not published (not published) + Instantly Hypergrowth + 29 Outbound add-ons (sequencer, warmup) ($2,620) = from $22,620
  • Primeforge + Instantly, 25,000 a day: 834 slots (10 at $4.50, the rest at $3.70) ($3,093.80) source (opens the vendor's page in a new tab) + 278 domains at $14 a year ($324.33) + Instantly Hypergrowth + 7 Outbound add-ons (sequencer, warmup) ($706) = $4,124.13
  • Primeforge + Instantly, 50,000 a day: 1667 slots (10 at $4.50, the rest at $3.50) ($5,844.50) source (opens the vendor's page in a new tab) + 556 domains at $14 a year ($648.67) + Instantly Hypergrowth + 14 Outbound add-ons (sequencer, warmup) ($1,315) = $7,808.17
  • Primeforge + Instantly, 100,000 a day: 3334 slots (10 at $4.50, the rest at $3.50) ($11,679) source (opens the vendor's page in a new tab) + 1,112 domains at $14 a year ($1,297.33) + Instantly Hypergrowth + 29 Outbound add-ons (sequencer, warmup) ($2,620) = $15,596.33
  • Cheap Inboxes + Instantly, 25,000 a day: 1667 mailboxes at $2.80 ($4,667.60) source (opens the vendor's page in a new tab) + 556 domains at $9.99 a year ($462.87) + Instantly Hypergrowth + 7 Outbound add-ons (sequencer, warmup) ($706) = $5,836.47
  • Cheap Inboxes + Instantly, 50,000 a day: 3334 mailboxes at $2.80 ($9,335.20) source (opens the vendor's page in a new tab) + 1,112 domains at $9.99 a year ($925.74) + Instantly Hypergrowth + 14 Outbound add-ons (sequencer, warmup) ($1,315) = $11,575.94
  • Cheap Inboxes + Instantly, 100,000 a day: 6667 mailboxes at $2.80 ($18,667.60) source (opens the vendor's page in a new tab) + 2,223 domains at $9.99 a year ($1,850.65) + Instantly Hypergrowth + 29 Outbound add-ons (sequencer, warmup) ($2,620) = $23,138.25
  • Puzzle Inbox + Instantly, 25,000 a day: 8,334 Outlook inboxes at $0.35 ($2,916.90) source (opens the vendor's page in a new tab) + 84 domains, price not published (not published) + Instantly Hypergrowth + 7 Outbound add-ons (sequencer, warmup) ($706) = from $3,622.90
  • Puzzle Inbox + Instantly, 50,000 a day: 16,667 Outlook inboxes at $0.35 ($5,833.45) source (opens the vendor's page in a new tab) + 167 domains, price not published (not published) + Instantly Hypergrowth + 14 Outbound add-ons (sequencer, warmup) ($1,315) = from $7,148.45
  • Puzzle Inbox + Instantly, 100,000 a day: 33,334 Outlook inboxes at $0.35 ($11,666.90) source (opens the vendor's page in a new tab) + 334 domains, price not published (not published) + Instantly Hypergrowth + 29 Outbound add-ons (sequencer, warmup) ($2,620) = from $14,286.90

Why each plan at scale

At 2,500 cold emails a day, each at its own emails per inbox a day: Puzzle Inbox Outlook is 834 inboxes at $0.35 ($291.90) plus Instantly Hypergrowth ($97), $388.90 before domains. InboxKit is from $286 before domains, LiteMail $419, Zapmail $432.83, Primeforge $507.67, Hypertide from $597 and Cheap Inboxes $686.37.

Outreach2day is $171.67 with warmup, our sequencer and 20 domains, or $268.67 with our mailboxes in Instantly. On Google Workspace Puzzle Inbox needs 209 inboxes at $3 for the same volume, $724 with Instantly before domains.

Your size

What 2,500 cold emails a day cost a month

121,000+
  • Puzzle Inbox + InstantlyPuzzle Inbox + Instantlyfrom $388.90

    834 mailboxes × 3 a day = 2,500 cold emails a day

  • Outreach2day mailboxes + InstantlyOutreach2day mailboxes + Instantly$268.67

    100 mailboxes × 25 a day = 2,500 cold emails a day

  • Outreach2day all-inOutreach2day all-in$171.67

    100 mailboxes × 25 a day = 2,500 cold emails a day

You save $217.23 a month ($2,607 a year)with Outreach2day at 2,500 cold emails a day, against Puzzle Inbox + Instantly at list prices

We move your mailboxes and campaigns for you, free

Create 100 mailboxes

Switching

Moving from Puzzle Inbox to Outreach2day

  1. Keep your sequencer

    Connect Instantly or Smartlead in Outreach2day with an API key and the warm mailboxes are added to your account; other tools take a CSV in their import format, or SMTP/IMAP logins. How the export works

  2. Or move the campaigns

    Our sequencer runs campaigns with steps, a send schedule, stop on reply and one inbox for replies; import the contacts as a CSV and recreate the steps. The mailbox price stays $2.50.

  3. Warmup and the overlap

    New mailboxes warm for 14 days before cold email, and warmup keeps running after that. Keep the Puzzle Inbox mailboxes sending during those two weeks, then shift the volume and cancel Puzzle Inbox for the end of its billing period.

Puzzle Inbox renews every 29 days; cancel by WhatsApp at least 5 days before the renewal date, and cancelled inboxes are deleted about 48 hours before it. Nothing is refunded after the onboarding form.

Puzzle Inbox

Puzzle Inbox itself

Price per mailbox

source (opens the vendor's page in a new tab)
from $0.35 (Outlook, 3 cold emails a day)

Smallest order

source (opens the vendor's page in a new tab)
Not published

Setup time

source (opens the vendor's page in a new tab)
24–72 hours after the onboarding form; large Outlook orders and pre-warmed stock can take longer

Mailbox types

source (opens the vendor's page in a new tab)
Google Workspace and Outlook 365 (Microsoft 365) inboxes, standard or pre-warmed

Sending limits

source (opens the vendor's page in a new tab)
12 cold + 12 warmup emails an inbox a day on Google, 3 cold + 3 warmup on Outlook

Warmup

source (opens the vendor's page in a new tab)
Partly, or at extra cost Standard inboxes arrive raw and you warm them; pre-warmed inboxes get 14 days on Puzzle Inbox's side

Sequencers

source (opens the vendor's page in a new tab)
A CSV of logins for Smartlead, Instantly, Lemlist, Saleshandy, Reply.io and others; loaded for you on request

MCP server

source (opens the vendor's page in a new tab)
Not included None found

Refunds

source (opens the vendor's page in a new tab)
Only within 24 hours of payment and before the onboarding form; suspended inboxes are never refunded

Trustpilot

source (opens the vendor's page in a new tab)
3.8 / 5 from 23 reviews

Read the full Puzzle Inbox review

Choosing

Why Puzzle Inbox buyers look elsewhere

The sending cap is the first reason. $0.35 buys an Outlook inbox that Puzzle Inbox caps at 3 cold emails a day, so a team sending 2,500 a day runs 834 inboxes, 9 domains and a sequencer plan that warms them. The second is warmup: standard inboxes arrive raw, and pre-warmed ones cost $0.50 Outlook and $4.50 Google.

The third is the terms. Refunds end 24 hours after payment or once the onboarding form is in, suspended inboxes are never refunded, and cancelling takes a WhatsApp message at least 5 days before a 29-day renewal. Prices, caps and terms with sources are in the Puzzle Inbox review.

If Outlook is the reason

Outlook inboxes at a few cents look low per inbox and high per email. Hypertide's Entra inboxes cost $1 each at about 5 sends a day; InboxKit and Zapmail sell Microsoft 365 at $3 to $3.90 with higher daily volumes. Outreach2day mailboxes run on our own infrastructure and land in the inbox, at 25 cold emails a day each. Most people think only Google or Microsoft gets there and overpay for it. More in Outreach2day vs Puzzle Inbox.

Outreach2day

Outreach2day as a Puzzle Inbox alternative

We make Outreach2day and list it first. Where it fits and where it does not.

It fits if

  • You run 100+ mailboxes: $1.50 a mailbox from 100 and $0.50 from 1,000, warmup and the sequencer included; larger volumes on the Enterprise plan
  • You want 25 cold emails a mailbox a day with warmup and a sequencer in the price
  • You run 100+ mailboxes: $1.50 each from 100, $0.50 from 1,000
  • You keep Instantly or Smartlead: our mailboxes sync by API key
  • You want a REST API and an MCP server for domains, mailboxes, warmup and campaigns

It does not fit if

  • You need fewer than 12 mailboxes: the minimum order is 12

FAQ

Puzzle Inbox alternatives: questions

What is the best Puzzle Inbox alternative?

InboxKit for Google or Microsoft at a flat $3, LiteMail for self-serve plans, Zapmail for warmup handled, Hypertide for Outlook priced per domain. Outreach2day if you want 25 cold emails a mailbox a day with warmup and a sequencer at $1.50 from 100 and $0.50 from 1,000.

What do 2,500 cold emails a day cost with the alternatives?

With Instantly Hypergrowth for sending, each at its own emails per inbox a day: Puzzle Inbox Outlook $388.90 before domains, InboxKit from $286, LiteMail $419, Zapmail $432.83, Primeforge $507.67, Hypertide from $597, Cheap Inboxes $686.37. Outreach2day is $171.67 with warmup, its sequencer and 20 domains.

Why does a $0.35 inbox cost more per email?

Puzzle Inbox caps Outlook at 3 cold emails an inbox a day, so each cold email a day costs about $0.117 a month in inboxes alone. An Outreach2day mailbox sends 25 a day: $0.06 per cold email a day at $1.50 and $0.02 at $0.50.

Which Puzzle Inbox alternatives include warmup?

Outreach2day includes it for every mailbox and Zapmail handles it per its FAQ. InboxKit sells it as a $3 add-on and Primeforge as Warmforge; LiteMail and Puzzle Inbox sell pre-warmed inboxes at a higher price.

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. Mailboxes are $1.50 from 100 and $0.50 from 1,000; for larger volumes we size an Enterprise plan with you.

  • 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
  • Larger volumes: the Enterprise plan and its price for your setup

Free call

See open times in your time zone and book on this page.

Or open the booking page

Related

More on Puzzle Inbox

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.

Outreach2day
InboxKit
LiteMail
Zapmail
Hypertide
Primeforge
Cheap Inboxes
Puzzle Inbox

Full volume from day 14: 25 cold emails a mailbox a day

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

Book a call