The Cold-Email Engine
High-volume cold outreach with real deliverability — find, enrich, send, land in the inbox.
What's in the stack.
Scale cold email outreach with unlimited sending accounts and built-in warmup.
from $37/mo (Growth) — check pricing
Waterfall email and phone enrichment — pulls from multiple data providers in one lookup.
from $29/mo (Starter) — check pricing
A CRM that fills itself in — auto-logs emails, meetings, and contact data.
from $29/mo (Growth) — check pricing
Improve cold email deliverability by training inbox providers to trust your sending domain.
from $49/mo (Starter) — check pricing
The rationale.
FullEnrich waterfall-enriches your prospect list so you're emailing real, verified addresses. Instantly sends at volume across multiple warmed sending accounts. InboxAlly trains inbox providers to trust your domains over time, compounding deliverability. Salesflare captures replies and tracks conversations without you logging anything manually. The stack solves the three failure modes of cold email: bad data, inbox-folder delivery, and dropped follow-up.
The handoffs.
Export the FullEnrich-enriched CSV (name, company, verified email) and import into Instantly as a new campaign lead list. Map 'first_name' and 'company' columns to Instantly personalisation variables.
Instantly webhook on 'replied' event pushes the lead (name, email, reply content) to Salesflare via its native Zapier integration, creating a new contact and a follow-up reminder task automatically.
InboxAlly is not a direct data integration — it runs parallel on your sending domains. Configure InboxAlly to warm the same domains and sending accounts you use in Instantly. No API connection; it's an infrastructure layer.
Where tools overlap.
Where AI speeds this up.
Use AI (Claude, GPT-4) to generate variations of your cold email sequence — subject lines, opening lines, and follow-up angles — from your ICP definition. Feed Instantly's sequence editor 3–5 AI variants and A/B-test them. FullEnrich's waterfall can be supplemented by AI-sourced LinkedIn data if you connect it via Clay.
What to watch for.
- InboxAlly improves deliverability over weeks, not overnight — budget 4–6 weeks for meaningful inbox rate improvement before judging the stack.
- FullEnrich credits are consumed per lookup — high-volume prospecting (10,000+ contacts/mo) adds meaningful credit cost above the Starter plan. Verify pricing for your volume.
- Instantly's Growth plan limits active campaigns. If you're running multiple ICPs simultaneously, you may need the Hypergrowth plan ($97/mo).
How we scored this stack.
You get the deal, we get a referral — it funds the research. Same tool, often a better price. Full detail on how we make money.
Last reviewed: 2026-06-12
Evidence basis: Documentation Verified