Best Cold Email Software in 2026
Instantly, Smartlead and Salesforge are the leading cold email platforms for teams sending at volume across many mailboxes. All three offer unlimited mailboxes with warmup on paid plans. Smartlead suits agencies wanting infrastructure control, Instantly has the lowest entry price, and Salesforge adds LinkedIn and AI personalisation with native HubSpot sync.
Cold Email tools compared
| Tool | Starting price | Free plan | HubSpot integration | Best for |
|---|---|---|---|---|
| Instantly | $37.6/month | Not stated | Native integration | Agencies and outbound teams that run many mailboxes and want a low entry price for sending volume. |
| Salesforge | $48/month | No | Native integration | Small outbound teams and agencies wanting email plus LinkedIn with AI personalization. |
| Smartlead | $32/month | Not stated | Native integration | Agencies and teams sending high cold email volume that want infrastructure control. |
How to choose
- Send from separate domains and mailboxes, never your primary domain
- Unlimited mailboxes and warmup included vs priced per mailbox
- Native HubSpot sync for replies and meetings
- Contact and email limits per month on each tier
Instantly
Instantly starts at $37.6/month (Outreach Growth plan, billed yearly; $47 billed monthly). Cold email sending with unlimited mailboxes and warmup, plus a lead database.
Salesforge
Salesforge starts at $48/month (Pro plan). Salesforge has no free plan. Free trial: 14 days. Cold email and LinkedIn outreach tool, plus an AI SDR agent called Frank.
Smartlead
Smartlead starts at $32/month (Base plan, billed yearly; $39 billed monthly). Free trial: Free trial, no credit card required (length not stated). Cold email sender with unlimited mailboxes, warmup and its own server infrastructure.
Frequently asked questions
What is the best cold email software?
For volume outbound, Instantly, Smartlead and Salesforge. Pick on CRM sync, LinkedIn needs and agency features rather than price alone.
How many emails can I send per mailbox per day?
Most deliverability guidance keeps cold sending to around 30 to 50 emails per mailbox per day, spread across many mailboxes and domains.
Do I need separate domains for cold email?
Yes. Use dedicated sending domains and mailboxes, set up SPF, DKIM and DMARC, and warm them before sending to protect your primary domain.
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