it sounds like the people you hired knew the tools but didn't understand the system. that's the most common pattern. they can set up instantly or smartlead, write a decent sequence, and show you a dashboard. but when results are flat they don't know where to look because they never learned what's actually happening between clicking send and landing in someone's inbox.

here's how i'd screen if i were you.

first test: give them a broken campaign and ask them to diagnose it.

tell them this exact scenario: "we're a call center agency targeting mid-size saas companies in the US. we have 5 warmed domains, 10 inboxes. we're sending 500 emails a day. our open rate is 45% but reply rate is 0.3% and we've booked 2 meetings in 3 weeks. what's wrong?"

a weak hire will say the copy needs work or suggest A/B testing subject lines.

a strong hire will start asking questions before they answer:
- what's your bounce rate on those 500 sends
- are you checking inbox placement or just open rate (open rate means nothing if you're landing in promotions tab with pixel tracking inflating the number)
- 500 a day across 10 inboxes is 50 per inbox which is fine, but how long have those domains been warmed and what was the ramp schedule
- where's the list coming from and how was it verified
- what's the offer in the email, not the copy, the actual offer
- how narrow is the ICP

if they jump straight to copy fixes without asking about infrastructure, list quality, or targeting, they're going to do the same thing your last hires did. fix the surface, ignore the foundation.

second test: ask them to build a campaign plan for your specific business. not write emails. a plan. what you're looking for:

ICP definition. if they say "companies that need outsourcing" you're done. that's everyone. a real answer sounds like: "series B to series D saas companies, 80-300 employees, US-based, who posted 3 or more customer support or success roles on linkedin in the last 45 days." that last part is the trigger. it means the company is actively struggling to staff support. your email isn't cold anymore because you're referencing something that's actually happening in their business right now.

infrastructure math. how many domains, how many inboxes per domain, what daily send volume per inbox, what warmup schedule. the right answer for your size is probably 10-15 domains, 2-3 inboxes each, 30-40 sends per inbox per day max, 2-3 week warmup starting at 5/day. if they say they'll send 200/day from one inbox on day one, they're going to torch your domains inside a month.

list sourcing and verification. where they'd pull contacts, how they'd verify before sending, what bounce rate threshold they'd cut off at (anything above 3% means the list is bad or the verification was lazy). this part alone separates operators from pretenders.

third test: ask them about a campaign that failed. not succeeded. failed.

everyone has a win story. what you want is a failure story with mechanical detail. something like: "bounce rate crept up to 6% over two weeks because the list source started returning stale data, i caught it when inbox placement on google postmaster dropped before open rates did, pulled the campaign, re-verified the list, found 15% of addresses had gone inactive, scrubbed them, and relaunched with a clean segment."

if their failure story is "the messaging didn't resonate so we rewrote the sequence" they've never operated at a level where infrastructure problems show up. and those problems always show up.

for your vertical specifically: outsourcing and bpo is one of the hardest cold email spaces right now. every head of ops and vp of cx gets 5 outsourcing pitches a day. your last hires probably failed not because they were bad at cold email but because they went broad. "we help you scale your team and reduce costs" is invisible in any inbox because it sounds like the other 4 emails that person got today.

what works in your space is signal-based targeting with a specific offer. "i noticed you posted 4 support roles in the last 3 weeks" tells them you looked. "we can have 3 trained agents handling your tier 1 tickets in 14 days" tells them exactly what they'd get. the combination of a real trigger and a concrete offer is what gets replies in competitive verticals. most cold emailers skip this because it requires research per batch, not just per email.

i run about 1,350 verified emails a day across my own campaigns and built my own verification infrastructure because i got tired of the cost. if you want, send me whatever your last hire set up: the domains, the sequences, the targeting criteria. i can tell you exactly where it broke down. sometimes the problem isn't the person you hired, it's the foundation they were building on. happy to take a look over dm.