Ranking · 2026 · 52 ranked
Companies that sell inboxes for cold email: Google Workspace and Microsoft 365 resellers, private SMTP providers and flat-rate infrastructure, scored on 20 conditions that decide how much work and risk is left on your side.
Confirms automatic SPF/DKIM/DMARC, inbox placement tests and Google Workspace inboxes.
Highest score among all inbox providers. · $2/inboxConfirms automatic SPF/DKIM/DMARC, replacement of burned inboxes and Google Workspace inboxes.
Highest score among Google Workspace and Microsoft 365 resellers. · $2.50/inboxConfirms automatic SPF/DKIM/DMARC, replacement of burned inboxes and Google Workspace inboxes.
Highest score among flat-rate, unlimited-inbox providers. · from $40/moConfirms ongoing warm-up in the price, automatic SPF/DKIM/DMARC and replacement of burned inboxes.
Highest score among private SMTP providers. · $0.60/inboxConfirms automatic SPF/DKIM/DMARC, Microsoft 365 inboxes and dedicated IPs.
Lowest price per inbox among providers scoring above the median. · $0.37/inboxConfirms automatic SPF/DKIM/DMARC, replacement of burned inboxes and Google Workspace inboxes.
Highest score with a public API and an official MCP server. · $2.50/inboxPicks go to the highest score in each segment; picks never go to a vendor the author works with.
| # | Provider | Where the points come from | Score | Per inbox |
|---|---|---|---|---|
| 1 |  MailOptimalGoogle · Microsoft · SMTP |
83 | $2/inbox$1 at volume | |
| 2 |  Outreach2daySMTP |
77 | $2.50/inbox | |
| 3 |  MailDeckGoogle · Microsoft · SMTP |
76 | $0.60/inbox$0.40 at volume | |
| 4 |  IcemailGoogle · Microsoft · SMTP |
73 | $2.50/inbox | |
| 5 |  ZapmailGoogle · Microsoft |
63 | $3.90/inbox$2.99 at volume | |
| =6 |  HypertideGoogle · Microsoft |
62 | $3.30/inbox$1 at volume | |
| =6 |  SkySendersSMTP |
62 | $2.95/inbox$2.69 at volume | |
| 8 |  SmtpfoxSMTP |
61 | $1.63/inbox$1.49 at volume | |
| =9 |  MaildosoSMTP |
60 | $2.50/inbox$0.49 at volume | |
| =9 |  ScaledMailGoogle · Microsoft · SMTP |
60 | $0.94/inbox | |
| =9 |  Sender PoolsGoogle · Microsoft · SMTP |
60 | $40/mo | |
| =9 |  SliceyGoogle · Microsoft |
60 | $0.49/inbox$0.25 at volume | |
| =9 |  WinnrSMTP |
60 | $1.38/inbox$0.95 at volume | |
| =14 |  AerosendSMTP |
59 | $4/inbox$2 at volume | |
| =14 |  InboxKitGoogle · Microsoft |
59 | $3/inbox$2.50 at volume | |
| =14 |  InframailMicrosoft |
59 | $0.37/inbox | |
| =14 |  MailBombGoogle · Microsoft |
59 | $2/inbox$1 at volume | |
| 18 |  NudoInfraMicrosoft |
58 | $1.50/inbox$0.97 at volume | |
| 19 |  ColdSendMicrosoft |
57 | $0.99/inbox$0.30 at volume | |
| =20 |  MailpoolGoogle · Microsoft · SMTP |
56 | $3/inbox$2.60 at volume | |
| =20 |  OSDomainsGoogle · Microsoft · SMTP |
56 | $3.38/inbox$1.97 at volume | |
| =22 |  Inbox NavigatorGoogle · Microsoft |
54 | $3/inbox | |
| =22 |  sending.acMicrosoft |
54 | $0.57/inbox$0.50 at volume | |
| 24 |  Email AstraGoogle · Microsoft |
53 | $5/inbox | |
| 25 |  Premium InboxesGoogle · Microsoft |
52 | $3.50/inbox$2.80 at volume | |
| 26 |  FrostmailerGoogle · Microsoft |
51 | $3.38/inbox$0.34 at volume | |
| 27 |  Endy InboxesGoogle · Microsoft |
48 | $3.50/inbox$3 at volume | |
| =28 |  Cheap InboxesGoogle · Microsoft |
47 | $3.50/inbox$2.80 at volume | |
| =28 |  ColdInfraGoogle · Microsoft |
47 | $3/inbox$2.50 at volume | |
| 30 |  InboxlogyGoogle · Microsoft |
46 | $3.50/inbox$2.80 at volume | |
| 31 |  MailforgeSMTP |
45 | $3/inbox$2.40 at volume | |
| =32 |  InfraforgeSMTP |
43 | $4/inbox | |
| =32 |  LiteMailGoogle · Microsoft |
43 | $3.70/inbox$2.85 at volume | |
| =32 |  Puzzle InboxGoogle · Microsoft |
43 | $3/inbox$0.35 at volume | |
| =32 |  WarmInboxesGoogle · Microsoft |
43 | $3.50/inbox$2 at volume | |
| =36 |  Mission InboxSMTP |
40 | $3.33/inbox | |
| =36 |  PrimeforgeGoogle · Microsoft |
40 | $4.50/inbox | |
| =36 |  SurgeMailGoogle |
40 | $2.27/inbox$1.90 at volume | |
| =39 |  Diamond MailGoogle · Microsoft · SMTP |
39 | $4.99/inbox$3.99 at volume | |
| =39 |  PeekerGoogle · Microsoft |
39 | $3.50/inbox$2.80 at volume | |
| =39 |  PureMailGoogle · Microsoft |
39 | $3.30/inbox$2.90 at volume | |
| =39 | UUnlimited InboxesMicrosoft | 39 | $1.05/inbox$0.06 at volume | |
| 43 |  ScaledInboxesGoogle · Microsoft |
38 | $3.50/inbox$0.50 at volume | |
| 44 |  Deliveryman AISMTP |
37 | $49/mo | |
| 45 |  MailscaleSMTP |
34 | $5.27/inbox$1 at volume | |
| =46 |  F60HostGoogle · Microsoft |
33 | $5/inbox | |
| =46 |  Leads MonkyGoogle · Microsoft |
33 | $3.70/inbox$2.60 at volume | |
| =46 |  MailreefSMTP |
33 | $249/mo | |
| 49 |  ColdSireGoogle · Microsoft |
30 | $6/inbox | |
| 50 |  GoBoxMateGoogle |
28 | $3.89/inbox$3.25 at volume | |
| 51 |  wizeMailsGoogle · SMTP |
26 | $22.38/inbox$18.09 at volume | |
| 52 |  LUNATRO.MXMicrosoft |
24 | $0.50/inbox |
Deliverability 27Inbox choice 16Sending 15API & AI 7Buying terms 10Setup cost 25
Each bar is the score split by group (group weight in grey). Score out of 100 from conditions confirmed on the vendor's own site, plus up to 25 points for the cost of a 30-inbox setup. Prices shown: monthly billing, smallest public package.
By use case: Google Workspace inboxes · Microsoft 365 inboxes · Private SMTP inboxes · Warm-up included · For agencies · For AI agents · Try before you pay · Also: Cold email software · Prices
PDF report · November 2026
52 inbox providers ranked and scored on 20 conditions, with the honest limit of each of the top ten, pricing sources and the full method.
14 pages · 1669 KB · v1.0 · free, no email required
For these 3 providers we could check fewer than 55% of the conditions: Mailin, Mailrun, MorphyMail. They get no position until we can check more, so missing facts do not look like a low score.