Cold Email Index Free PDF reports

Best for · 2026

Cold email infrastructure for agencies

Agencies need separate client workspaces or a white-label option. These providers and tools confirm one or the other on their own sites.

Included if the vendor confirms on its site: agency features (client workspaces or white-label). Ordered by overall score.

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

Inbox providers 27

#ProviderWhere the points come fromScorePer 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 Sender PoolsGoogle · Microsoft · SMTP 60 $40/mo
=8 WinnrSMTP 60 $1.38/inbox$0.95 at volume
=10 AerosendSMTP 59 $4/inbox$2 at volume
=10 InboxKitGoogle · Microsoft 59 $3/inbox$2.50 at volume
=12 MailpoolGoogle · Microsoft · SMTP 56 $3/inbox$2.60 at volume
=12 OSDomainsGoogle · Microsoft · SMTP 56 $3.38/inbox$1.97 at volume
14 sending.acMicrosoft 54 $0.57/inbox$0.50 at volume
15 Email AstraGoogle · Microsoft 53 $5/inbox
16 Premium InboxesGoogle · Microsoft 52 $3.50/inbox$2.80 at volume
17 FrostmailerGoogle · Microsoft 51 $3.38/inbox$0.34 at volume
18 Endy InboxesGoogle · Microsoft 48 $3.50/inbox$3 at volume
=19 Cheap InboxesGoogle · Microsoft 47 $3.50/inbox$2.80 at volume
=19 ColdInfraGoogle · Microsoft 47 $3/inbox$2.50 at volume
=21 InfraforgeSMTP 43 $4/inbox
=21 LiteMailGoogle · Microsoft 43 $3.70/inbox$2.85 at volume
=23 PeekerGoogle · Microsoft 39 $3.50/inbox$2.80 at volume
=23 UUnlimited InboxesMicrosoft 39 $1.05/inbox$0.06 at volume
25 ScaledInboxesGoogle · Microsoft 38 $3.50/inbox$0.50 at volume
26 MailscaleSMTP 34 $5.27/inbox$1 at volume
27 MailreefSMTP 33 $249/mo

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 20

#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
=8 SmartReach.ioSequencer with built-in inboxes 82 $29/mo
=10 Reply.ioSequencer with built-in inboxes 81 $59/mo
=10 SalesBlinkSequencer with built-in inboxes 81 $29/mo
=10 SuperSendSequencer with built-in inboxes 81 $59/mo
13 ReachInboxSequencer with built-in inboxes 76 $30/mo
14 QuickProspSequencer with built-in inboxes 70 —
=15 La Growth MachineCold email sequencer 60 $67.50/mo
=15 SendKitCold email sequencer 60 $99/mo
17 HotHawkCold email sequencer 59 $97/mo
18 EmailBisonCold email sequencer 54 $599/mo
=19 Cheap SequencerSequencer with built-in inboxes 48 $29/mo
=19 QuickMailCold email sequencer 48 $49/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 AI agents · Software with inboxes · Try before you pay