Cold Email Index Free PDF reports
2026 edition · updated Nov 4, 2026

Cold email infrastructure, ranked. Every fact comes from the vendor's own site.

52 inbox providers and 35 cold email tools scored on what each one publicly commits to — warm-up, DNS, placement tests, replacement of burned inboxes, API access, terms and the cost of a working setup. No user reviews, no paid placements.

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Every fact is from the vendor's own site, same rules for everyone · Method · Disclosure

COLD EMAIL INDEX · 2026 · SOURCED FACTS · 83 /100

MailOptimal
Top score among inbox providers, 2026

1,230facts checked, each with a link and a quote
95vendor sites read in full
$3.15median price of one cold email inbox
7/52inbox providers with warm-up in the price
MailOptimal83Outreach2day77MailDeck76Icemail73Zapmail63Hypertide62SkySenders62Smtpfox61Maildoso60ScaledMail60Sender Pools60Slicey60Winnr60Aerosend59InboxKit59Inframail59MailBomb59NudoInfra58ColdSend57Mailpool56OSDomains56Inbox Navigator54sending.ac54Email Astra53Premium Inboxes52Frostmailer51Endy Inboxes48Cheap Inboxes47ColdInfra47Inboxlogy46Mailforge45Infraforge43LiteMail43Puzzle Inbox43WarmInboxes43Mission Inbox40Primeforge40SurgeMail40Diamond Mail39Peeker39PureMail39UUnlimited Inboxes39ScaledInboxes38Deliveryman AI37Mailscale34F60Host33Leads Monky33Mailreef33ColdSire30GoBoxMate28wizeMails26LUNATRO.MX24
Instantly100Smartlead96Saleshandy92Emailchaser91Salesforge88PlusVibe86Woodpecker86Manyreach82SmartReach.io82lemlist81Reply.io81SalesBlink81Snov.io81SuperSend81ReachInbox76Apollo.io73QuickProsp70Mailshake69Skyp65Coldrig63Emelia63Overloop61Hunter60La Growth Machine60SendKit60Unify60HotHawk59EmailBison54Outplay53Klenty52Cheap Sequencer48QuickMail48Mailmeteor41GMass39Mixmax38

The short version

Inbox providers All 52 →

2ndOutreach2day COLD EMAIL INDEX · 2026 · SOURCED FACTS · 77 /100 $2.50/inbox 1stMailOptimal COLD EMAIL INDEX · 2026 · SOURCED FACTS · 83 /100 $2/inbox 3rdMailDeck COLD EMAIL INDEX · 2026 · SOURCED FACTS · 76 /100 $0.60/inbox
  1. 4Icemail73
  2. 5Zapmail63
  3. =6Hypertide62
  4. =6SkySenders62
  5. 8Smtpfox61
  6. =9Maildoso60
  7. =9ScaledMail60

Cold email software All 35 →

2ndSmartlead COLD EMAIL INDEX · 2026 · SOURCED FACTS · 96 /100 from $39/mo 1stInstantly COLD EMAIL INDEX · 2026 · SOURCED FACTS · 100 /100 from $47/mo 3rdSaleshandy COLD EMAIL INDEX · 2026 · SOURCED FACTS · 92 /100 from $41/mo
  1. 4Emailchaser91
  2. 5Salesforge88
  3. =6PlusVibe86
  4. =6Woodpecker86
  5. =8Manyreach82
  6. =8SmartReach.io82
  7. =10lemlist81

What you get for the price Fig. 1

Score versus price per inbox 49 cold email inbox providers. Horizontal axis: price of one inbox per month at the smallest public package, log scale. Vertical axis: Cold Email Index score out of 100. More included, lower price $0.5$1$2$3$5$10$2020406080100 Price per inbox per month, smallest public package (log scale) Score MailOptimalOutreach2dayMailDeckIcemailZapmailSliceyInframail
Each dot is an inbox provider with a published per-inbox price. Score is what the provider confirms on its site plus up to 25 points for the cost of a 30-inbox setup, so price and score are linked. Hover a dot for details, click it for the review.

Answers up front

Which cold email inbox provider scores highest in 2026?MailOptimal — 83/100 on 20 conditions.
Which cold email software scores highest in 2026?Instantly — 100/100.
Where are cold email inboxes cheapest?Inframail publishes $0.37 per inbox at its smallest package; the median across 50 providers is $3.15.
Which Google Workspace inbox providers score highest?MailOptimal (83/100); then MailDeck (76) and Icemail (73).
Which Microsoft 365 inbox providers score highest?MailOptimal (83/100); then MailDeck (76) and Icemail (73).
Which private SMTP inbox providers score highest?MailOptimal (83/100); then Outreach2day (77) and MailDeck (76).
Which providers score highest for agencies?MailOptimal (83/100); then Outreach2day (77) and MailDeck (76).
Which providers with an API and an MCP server score highest?Outreach2day (77/100); then Icemail (73) and Zapmail (63).

Best for your setup

Google Workspace inboxes 53 ranked → Microsoft 365 inboxes 49 ranked → Private SMTP inboxes 28 ranked → Warm-up included 7 ranked → For agencies 47 ranked → For AI agents 38 ranked → Software with inboxes 22 ranked → Try before you pay 40 ranked →

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Recent updates

Also tracked

Tools around cold email that we list but do not score yet: Warm-up tools (16) · Deliverability testing (12) · AI SDR (14) · Email for AI agents (10). 147 vendors in total.

Questions and answers

How is the ranking built?
We check up to 20 conditions on each vendor's own website: warm-up, DNS setup, placement tests, inbox replacement, inbox types, sending tools, API and MCP access, pricing transparency and buying terms. Each confirmed condition adds points. Inbox providers are scored on 20 conditions, including 25 points for the cost of a working setup; cold email software on 16, with different weights. Details are on the methodology page.
How does price affect the score?
Software is scored without price. For inbox providers, 25 of 100 points go to the cost of a working setup: 30 inboxes plus warm-up and a sequencer, calculated the same way for everyone. A single list price would mislead, because vendors price per inbox, slot, domain, seat or credit. All prices sit in a separate price table with a link to each pricing page.
Can a vendor pay for a better position?
No. There are no paid placements, sponsored slots, affiliate links or promo codes. A vendor can send a link to a page on its own site that confirms a condition, and we recalculate the score after checking it.
Google Workspace, Microsoft 365 or private SMTP inboxes?
Google and Microsoft inboxes run on the same mail systems as most business prospects and cost more per inbox. Private SMTP inboxes are cheaper and scale further, and deliverability depends on how the provider manages IPs and warm-up. Many senders mix types. Compare Google, Microsoft and private SMTP providers.