Healthtech Outbound, Run Through Instantly
Most healthtech products could plausibly sell into a dozen specialties — dental groups, dermatology clinics, behavioral health practices, ortho, urgent care. The expensive mistake is picking one vertical on instinct and staffing a sales motion around it before any market has actually answered back. Cold email is the cheapest way to make the market answer first, and Instantly's structure is unusually well suited to running that experiment: unlimited email accounts on paid plans, a simple campaign builder you can clone per vertical, and analytics that make cross-campaign comparison straightforward.
ColdRelay is the layer underneath — the secondary domains, mailboxes, and dedicated IPs Instantly actually sends from. This guide covers how healthtech teams pair the two to run parallel specialty campaigns, read the results like an experiment, and only then decide where the SDRs and the roadmap go.
Why Run Instantly on ColdRelay Infrastructure
Instantly is the sending and sequencing layer: campaigns, A/Z variant testing, the Unibox unified inbox, and analytics. It sends from whatever mailboxes you connect — it doesn't provision domains or own the deliverability of the accounts themselves. That's the infrastructure layer's job, and it's where ColdRelay fits: dedicated mailboxes on isolated Azure tenants with dedicated IPs, DNS (SPF, DKIM, DMARC) pre-configured, ready in about an hour. There's no warmup waiting period — warmup runs continuously as part of each mailbox's daily budget of 4 sends/day, split 2 outbound + 2 warmup.
The pairing matters most when you're running outbound as a multi-vertical experiment. A clean experiment needs deliverability held constant across every specialty campaign — if the dental campaign lands in the inbox and the dermatology one lands in spam, your conversion data is measuring infrastructure noise, not market demand. Dedicated IPs and 95%+ inbox placement keep the variable you're testing the message and the market, not the pipes. One boundary to hold throughout: every list is strictly business contact data — practice names, administrator titles, work emails. No patient data ever enters the outbound stack, so the experiment stays cleanly outside PHI territory. ColdRelay and Instantly are complementary layers, not alternatives: ColdRelay is the infrastructure, Instantly is the sending platform on top.
Visit Instantly →Connecting ColdRelay Mailboxes to Instantly
Provision a mailbox pool sized for parallel campaigns
Decide how many specialties you're testing, then provision on ColdRelay accordingly — three verticals at 25-35 mailboxes each is a common starting shape. ColdRelay supports 100-150 mailboxes per domain, so a single secondary domain can carry the whole experiment, though many teams split across 2-3 domains. Everything lands on isolated Azure tenants with dedicated IPs in about an hour, with SPF, DKIM, and DMARC already configured.
Bulk-import the mailboxes into Instantly via CSV
Export your mailbox credentials from the ColdRelay dashboard and use Instantly's bulk SMTP/IMAP import under Email Accounts → Add New → Bulk Import. Because Instantly's paid plans include unlimited email accounts, connecting 75-100 mailboxes adds no per-account software cost — the only thing that scales is your ColdRelay infrastructure. Set each account's daily campaign limit to 2 outbound emails, matching the 4 sends/day total per mailbox (2 outbound + 2 warmup, with warmup handled on ColdRelay's side).
Build one Instantly campaign per specialty
In Instantly's campaign builder, create a separate campaign for each vertical — dental, dermatology, behavioral health — rather than one blended healthcare campaign. Each gets its own lead list (business contacts only: practice administrators and office managers at that specialty), its own copy referencing that vertical's actual systems and bottlenecks, and its own dedicated slice of the mailbox pool. Separate campaigns are what make the results comparable later.
Set up A/Z variants to test your compliance framing
Within each campaign, use Instantly's A/Z testing to run variants of how you present HIPAA posture — one version leading with it in the opening line, one placing it after the value proposition, one carrying it in the signature block with a BAA mention. Healthcare buyers screen on compliance, but where that line performs best often differs by specialty; variants let each vertical tell you instead of guessing once for all of them.
Launch in parallel and manage replies from Unibox
Start all specialty campaigns the same week so seasonality and list-fatigue effects hit them equally. Replies from every campaign flow into Instantly's Unibox, where you can triage by campaign — which makes it obvious not just which vertical replies most, but which one replies with real buying intent. Work the Unibox daily; in an experiment, reply quality is the data.
The Healthtech Instantly Playbook
Treat each specialty as a hypothesis, not a territory
Before launch, write down what each vertical has to show to earn sales investment — for example, a 2%+ reply rate with at least a third of replies expressing genuine interest over 4-6 weeks. Without pre-committed thresholds, you'll rationalize whichever campaign you secretly favored. The point of running dental, dermatology, and behavioral health in parallel is to let Instantly's campaign analytics overrule your instincts.
Hold the experiment's variables constant
Give every specialty campaign the same mailbox count, the same daily send budget (2 outbound per mailbox within the 4/day total), the same sequence length, and the same launch week. The only things that should differ between campaigns are the list and the vertical-specific copy. If one campaign gets 40 mailboxes and another gets 15, you're not comparing markets — you're comparing capacity.
Let A/Z variants find each vertical's compliance register
A behavioral health practice administrator hears 'HIPAA-ready' differently than a dental office manager does — for one it's the entire conversation, for the other it's table stakes. Run the same set of compliance-framing variants in every campaign and compare which placement wins where. You'll often find your eventual one-pager and demo script for the winning vertical inside the winning variant.
Kill, scale, or iterate on a calendar — then move sales in
Set a review date 4-6 weeks out. Verticals that miss their thresholds get paused, not endlessly tweaked; the winner gets the SDR time, the case-study effort, and more ColdRelay mailboxes shifted to its campaign. Scaling the winner means adding infrastructure capacity, not pushing existing mailboxes past their per-mailbox budget — the 2 outbound sends/day ceiling is what keeps the deliverability you measured during the test.
Typical Healthtech Outbound Benchmarks (Instantly + ColdRelay)
| Metric | Benchmark | Notes |
|---|---|---|
| Inbox placement rate | 95%+ | Dedicated IPs hold placement constant across campaigns — the precondition for comparing verticals fairly |
| Reply rate spread across specialty campaigns | 0.5-4% | The spread is the finding: a 3-4x gap between your best and worst vertical is common and decisive |
| Outbound capacity per mailbox | 2/day | 4 sends/day total per mailbox — 2 outbound + 2 warmup |
| Time to a confident vertical decision | 4-6 weeks | Roughly 1,500-2,500 sends per specialty campaign before kill/scale thresholds are meaningful |
| Time to first campaign | Same day | ~60 minutes to provision on ColdRelay, plus CSV import and campaign setup in Instantly |
What It Costs: Instantly + ColdRelay
You pay per mailbox per month for the infrastructure, with volume tiers that drop as you scale (see the table below). DNS, dedicated IPs, and isolated Azure tenants are included — so a multi-vertical test prices by total mailbox count, not by number of campaigns.
Instantly is billed separately on its own subscription plans, which include unlimited email accounts on paid tiers — meaning splitting your pool across three specialty campaigns adds no software cost.
Infrastructure cost scales with mailbox count; Instantly's cost is a flat platform layer on top. That structure is what makes parallel specialty experiments cheap: testing three verticals instead of one costs more mailboxes, not more software.
| Mailboxes | ColdRelay price / mailbox / month |
|---|---|
| 1–199 | $1.00 |
| 200–999 | $0.85 |
| 1,000–4,999 | $0.70 |
| 5,000+ | $0.55 |
Each mailbox sends 4 emails per day — 2 outbound to prospects + 2 warmup. ColdRelay provisions mailboxes on isolated Azure tenants with dedicated IPs; Instantly handles the sending, sequencing, and inbox rotation on top.
Frequently Asked Questions
Does ColdRelay replace Instantly?
No — they're complementary layers of the same stack. Instantly handles campaigns, A/Z variant testing, the Unibox, and analytics. ColdRelay provides the underlying domains, mailboxes, and dedicated IPs that Instantly's campaigns send from. Healthtech teams use them together: ColdRelay as the infrastructure, Instantly as the sending and sequencing platform on top.
How many mailboxes do I need to test multiple healthcare specialties at once?
Work backward from the per-campaign volume you need for a real signal. At 2 outbound sends/day per mailbox (within the 4/day total alongside 2 warmup sends), 25 mailboxes per specialty gives each campaign 50 sends/day — roughly 1,500-2,000 sends over a 4-6 week test, enough for kill/scale thresholds to mean something. Three verticals lands you around 75 mailboxes, which fits on a single ColdRelay domain (100-150 mailboxes per domain) or split across two.
Does cold emailing dental, dermatology, or behavioral health practices create a HIPAA problem?
Not when your lists are strictly business contact data — practice names, administrator and office-manager titles, work emails, practice addresses. Nothing resembling patient information ever enters Instantly or ColdRelay, which keeps the outbound program cleanly outside PHI territory. Stating your product's HIPAA posture in the copy is a sales decision, not a compliance obligation of the campaign itself — and Instantly's A/Z variants let you test where that line performs best per specialty.
Do ColdRelay mailboxes need a warmup period before Instantly campaigns can launch?
No waiting period. Warmup runs continuously as part of each mailbox's daily budget — 2 warmup sends/day alongside 2 outbound sends/day, 4 total — and mailboxes arrive with SPF, DKIM, and DMARC pre-configured. Provisioning takes about an hour, so you can bulk-import via CSV into Instantly and launch all specialty campaigns the same day, which also keeps the parallel test's start dates aligned.