Our Honest Review of Instantly.ai After 1,000+ Campaigns

We’ve run over 1,000 campaigns across B2B SaaS, agencies, and service providers.
Along the way, we’ve tested every cold email platform that promised better deliverability, automation, and scale. Most were decent. A few stood out. But one platform consistently outperformed the rest:

Instantly.ai

This review is based on real-world usage, not affiliate hype.
We’ve stress-tested the platform on thousands of sends per day and onboarded dozens of clients through it.

Here’s what makes Instantly our go-to cold email platform — and a few things to keep in mind before you jump in.

What Instantly Gets Right

1. Done-For-You Domains and Inbox Setup

One of the biggest headaches in cold outbound is domain infrastructure. Instantly completely removes that barrier.

• Their DFY inbox service sets up warmed, rotated, and compliant domains

• SPF, DKIM, and DMARC are configured automatically

• You can spin up inboxes across multiple ESPs without tech stress

• Scales cleanly with no fear of domain burnout

This alone saves 10+ hours per sender and protects deliverability better than most teams can manage on their own.

2. Deliverability is Best-in-Class

Open rates are only as good as your inboxing. With Instantly, we’ve consistently hit 90 to 95 percent inbox placement across verified lists.

Why?

• Smart send scheduling

• Inbox rotation

• Bounce protection

• Warmup that actually works

If your team has ever dealt with domain flags or dropping open rates, this is a major win.

3. Support That Feels Like a Real Partnership

Instantly’s support team goes far beyond chat replies.
We’ve had:

• Troubleshooting calls within hours

• White-glove onboarding for client accounts

• Proactive recommendations on improving deliverability

For teams serious about outbound, this level of support is rare — and extremely valuable.

4. Built to Scale with Agencies and Multi-SDR Teams

Whether you’re an agency managing 10 clients or a B2B company with 5 reps, Instantly handles:

• Unlimited sender slots

• Cross-campaign analytics

• Shared lead management

• Sequence logic that adapts to ICP behavior

The workflow isn’t clunky. Everything connects.

A Few Limitations to Keep in Mind

No tool is perfect. Here are a few areas where Instantly has room to improve:

• UI learning curve for new users
  While the interface is powerful, onboarding could be more intuitive for beginners without guidance.

• Lacks native competitive lead enrichment or scraping
  While they have a lead database function, you’ll still need tools like Clay or Findymail to build and enrich your lists.

• Reply categorization can be basic at scale
  Sorting replies by intent is still a manual task, although integrations with CRM and Zapier help with tagging and routing.

Final Verdict

After 1,000+ campaigns, we can say this confidently:

Instantly.ai is the best cold email platform we’ve used in 2025.
It’s not just the tech. It’s the reliability, support, and time saved from managing backend headaches manually.

If your team is sending cold email at any kind of volume, this is the system to build on.

Want Help Launching a Cold Email System with Instantly?

We help B2B teams build full-stack outbound engines using Instantly, Clay, Findymail, and RB2B. We set up DFY infrastructure, connect your CRM, and hand over campaigns that land in inboxes.

Book a meeting to get your Instantly-powered cold email system launched.