Cold Email Index Free PDF reports

Best for · 2026

Cold email infrastructure for AI agents

If an AI assistant or your own agent should buy domains, create inboxes and launch campaigns, you need a documented API and, ideally, an official MCP server for Claude, ChatGPT or Cursor. These products confirm both.

Included if the vendor confirms on its site: a public API and an official MCP server. Ordered by overall score.

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

Inbox providers 14

#ProviderWhere the points come fromScorePer inbox
1 Outreach2daySMTP 77 $2.50/inbox
2 IcemailGoogle · Microsoft · SMTP 73 $2.50/inbox
3 ZapmailGoogle · Microsoft 63 $3.90/inbox$2.99 at volume
=4 MaildosoSMTP 60 $2.50/inbox$0.49 at volume
=4 Sender PoolsGoogle · Microsoft · SMTP 60 $40/mo
=4 WinnrSMTP 60 $1.38/inbox$0.95 at volume
=7 AerosendSMTP 59 $4/inbox$2 at volume
=7 InboxKitGoogle · Microsoft 59 $3/inbox$2.50 at volume
9 ColdSendMicrosoft 57 $0.99/inbox$0.30 at volume
10 sending.acMicrosoft 54 $0.57/inbox$0.50 at volume
11 FrostmailerGoogle · Microsoft 51 $3.38/inbox$0.34 at volume
12 Cheap InboxesGoogle · Microsoft 47 $3.50/inbox$2.80 at volume
13 MailforgeSMTP 45 $3/inbox$2.40 at volume
14 InfraforgeSMTP 43 $4/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.

Cold email software 24

#ToolWhere the points come fromScoreFrom
1 InstantlySequencer with built-in inboxes 100 $47/mo
2 SmartleadSequencer with built-in inboxes 96 $39/mo
3 SaleshandySequencer with built-in inboxes 92 $41/mo
4 EmailchaserSequencer with built-in inboxes 91 $47/mo
5 SalesforgeSequencer with built-in inboxes 88 $48/mo
=6 PlusVibeSequencer with built-in inboxes 86 $37/mo
=6 WoodpeckerSequencer with built-in inboxes 86 $39/mo
8 ManyreachSequencer with built-in inboxes 82 $79/mo
=9 lemlistCold email sequencer 81 $69/mo
=9 Reply.ioSequencer with built-in inboxes 81 $59/mo
=9 SalesBlinkSequencer with built-in inboxes 81 $29/mo
=9 Snov.ioAll-in-one sales platform 81 $39/mo
=9 SuperSendSequencer with built-in inboxes 81 $59/mo
14 ReachInboxSequencer with built-in inboxes 76 $30/mo
15 Apollo.ioAll-in-one sales platform 73 $59/mo
16 QuickProspSequencer with built-in inboxes 70 —
17 SkypSequencer with built-in inboxes 65 $199/mo
18 ColdrigSequencer with built-in inboxes 63 $49/mo
=19 HunterAll-in-one sales platform 60 $55.13/mo
=19 La Growth MachineCold email sequencer 60 $67.50/mo
21 HotHawkCold email sequencer 59 $97/mo
22 OutplayCold email sequencer 53 $49/mo
23 Cheap SequencerSequencer with built-in inboxes 48 $29/mo
24 MixmaxCold email sequencer 38 $29/mo

Deliverability 40Workflow 30API & AI 15Buying terms 15

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. Prices shown: monthly billing, smallest public package.

Other lists: Google Workspace inboxes · Microsoft 365 inboxes · Private SMTP inboxes · Warm-up included · For agencies · Software with inboxes · Try before you pay