u/ahsanishaq721

I've spent the last few months building two automation workflows specifically for cold email agencies running on Instantly. Before I start pitching this to agencies, I want an honest gut-check from people who actually use it daily.

What I built:

InboxSignal — The moment a reply hits your Instantly inbox, a webhook fires, AI classifies it into one of six categories: Interested, Not Interested, Out of Office, Referral, Unsubscribe, or Uncategorized — and instantly pushes a formatted Slack alert to the founder. Full dashboard with stats, filtering by category, and full reply history. No manual inbox checking.

HotLead Closer — Catches every INTERESTED reply and triggers an automated follow-up before the lead goes cold. The problem it solves: a prospect replies "yes, let's talk" at 2am Saturday in your Instantly unibox. You don't see it until Monday morning. By then they've already booked a call with someone else. This responds in under 5 minutes, automatically.

Both pull directly from Instantly webhooks and the Unibox API.

Three honest questions for this community:

How fast does someone on your team actually respond to INTERESTED replies right now — realistically?

Is a VA handling your reply triage, or is it falling on the founder?

Would you pay for something that catches hot leads 24/7, or is this a nice-to-have?

Not selling anything here. Just want to know if this solves a real problem before I take it further.

Been running cold email automation for agencies for a while now.

The problem I kept seeing wasn't deliverability or copy.

It was reply speed.

Agencies running 300-500 active leads/week were sitting on

INTERESTED replies for 4-8 hours because nobody was watching

the inbox. By the time someone responded, the prospect had

mentally moved on.

So I built a webhook listener that connects directly to Instantly.

The moment a reply comes in, it:

- Classifies it (INTERESTED, OOO, Not Interested, Referral,

Wrong Person, etc.)

- Fires a Slack alert within 5 seconds with the reply body

+ suggested next action

- Logs everything to a database for reporting

A few things worth sharing if you're thinking about building

something similar:

**Rule-based classification before AI saves ~35% in API costs.**

Most replies fit clear patterns. "Not interested," "wrong person,"

"let's connect." You don't need GPT-4 for those. Run rules first,

send only the ambiguous ones to AI.

**OOO replies are an untapped follow-up signal.**

Most agencies ignore them. But OOO replies tell you the exact

return date. We auto-flag those for a follow-up on that date.

Easy conversion opportunity that everyone leaves on the table.

**If you're using webhooks, build deduplication in from day one.**

Instantly occasionally fires the same event twice. Without a

processed check, you'll get duplicate alerts and waste API calls.

Learned this the hard way.

Currently running this for a few agencies. Reply speed went from

4-6 hours average down to under 5 minutes.

Happy to answer questions if anyone's building something similar

or thinking about automating reply handling on Instantly or

Smartlead.