Sending 1,000 cold emails costs about $30 for a solo founder, $17–41 for a small agency, and $10–15 for a volume shop, fully loaded with data, verification, inboxes, domains, software and AI, at October 2026 prices. At volume, the sequencer's share of that is under $1 per 1,000. Data and inboxes are 70–80% of the cost.
On the vendor side nobody publishes gross margins. Modelling the main cost drivers (IMAP polling, warmup traffic, sending IPs, tokens) gives two uncomfortable results for anyone building a sequencer. First, "unlimited inboxes" plus "AI on every email" can push a heavy mid-tier customer close to break-even. Second, reselling inboxes to a large agency can earn more gross profit than the software subscription.
The economics favour the vendor that controls the inbox and data lines, not the one with the nicest sequencer. Software is the hook. Infra and data resale are the margin.
What 1,000 cold emails cost, fully loaded
Assumptions, which are stated rather than sourced:
- Three emails per contact, so ~333 new contacts per 1,000 emails.
30 sends per Google inbox per day over 22 sending days (660 sends per inbox-month), plus 30% spare inboxes for warming and rotation. See Volume math: what 10k and 100k emails a day cost.- Three inboxes per domain.
| Line | Solo founder · 5k/mo | Small agency · 50k/mo | Volume agency · 500k/mo |
|---|---|---|---|
| Sequencer | $47 (Instantly Growth) | $94–329 (Smartlead Pro to Woodpecker) | $358 (Instantly Light Speed) |
| Inboxes | 10 × Zapmail Starter $39 | ~100 × $3–5 = $300–500 | ~1,000 × $3 = $3,000 (Google) or ~2,000 × $0.49 = $980 (Maildoso, 15/day cap) |
| Domains | 4 × $14/yr ≈ $5 | ~33 ≈ $33–52 | ~333 ≈ $389 |
| Data | 1,667 contacts ≈ $52 (Instantly credits ~$0.031) | 16,700 × $0.02–0.05 = $330–835 | 166,700 × $0.0165 ≈ $2,750 (LeadMagic annual Growth rate) |
| Verification | ≈ $10 | $67–134 | 166,700 × $0.004 ≈ $667 (Bouncer) |
| AI tokens | ≈ $1 | $9 (up to ~$170 with a web search per contact) | ≈ $90 |
| Total / month | ≈ $154 | ≈ $850–2,100 | ≈ $5,200–7,250 |
| Per 1,000 emails | ≈ $31 | ≈ $17–41 | ≈ $10–15 |
| Sequencer share | 31% | 11–16% | 5–7% |
AI tokens are priced at GPT-5.6 Luna rates of $0.20/1M input and $1.20/1M output, assuming ~1,500 input and 200 output tokens per contact.
Strip out data, because many senders bring their own lists. The volume shop's floor is then about $9 per 1,000 on Google inboxes and $5 on cheap SMTP. That is the number agencies use when they pitch "cost per meeting" to clients.
At 500k emails a month the sequencer is $0.72 per 1,000. Google inboxes are ~$6 per 1,000. Data is ~$5.50 per 1,000. A 50% cut in software price saves the customer ~2.5%. A 30% cut in inbox price saves them 12%.
A sequencer's own COGS
No cold email vendor publishes gross margin or cost of revenue.
No disclosed gross margin for Instantly, Smartlead, lemlist, Woodpecker or any volume sequencer. The figures below are an engineering model with stated assumptions, not reported numbers. Validate them against your own architecture in Build costs and team.
What a volume sequencer pays for, per connected inbox per month:
| Cost driver | What drives it | Modelled range per inbox-month |
|---|---|---|
| Reply detection (IMAP/Gmail API polling) | Polling interval × connected inboxes; persistent connections | $0.01–0.05 |
| Sending egress and IP reputation | Dedicated or rotated server IPs the platform connects from. Instantly sells "SISR" dedicated server and IP sharding only on Light Speed; Infraforge prices a dedicated IP at $99/month | $0.05–0.50 (one $99 IP shared by 200–2,000 inboxes) |
| Warmup network | Each inbox sends and receives warmup mail daily and the platform rescues it from spam. Warmup traffic can equal campaign traffic | $0.01–0.05 |
| AI reply classification | One small-model call per inbound reply | $0.01–0.03 |
| Total | ≈ $0.08–0.63 |
Apply that to a customer on Instantly Hypergrowth ($97/mo, 125k emails) who connects ~190 inboxes to max out the plan. Modelled COGS is ~$15–120 a month. At the low end the gross margin is ~85%. At the high end the customer loses money. That explains three things visible on the price pages:
- Dedicated IPs are kept for the top tiers. Examples are Instantly Light Speed at $358, EmailBison's single $599 plan with "isolated infrastructure with dedicated IPs", and PlusVibe Agency's "isolated sending server" from $497.
- AI is sold as credits or "bring your own key". Instantly lets customers "use your own LLM API key". Unlimited per-email AI on 500k sends would cost the vendor ~$270/month in tokens at Luna prices (500,000 × ~$0.00054), most of a $358 plan.
- Volume caps, not inbox caps, are the throttle. Caps on emails and contacts bound the polling and IP load per dollar of revenue.
Other cost lines not modelled here: human support (Instantly offers "Premium Live Support" from Hypergrowth), card fees, fraud and abuse handling, and the cost of providers suspending customers' inboxes. Those suspensions turn into churn and support tickets (Provider crackdowns).
The economics of reselling inboxes
The resale chain is visible on the price pages:
| Layer | Price per Google inbox/mo | Source |
|---|---|---|
| Google list price (Business Starter seat) | not captured; Instantly implies ≥ ~$6.25 | Instantly says its $5 is "about 20% less than buying the same inboxes directly from Google" |
| Wholesale-ish (volume DFY) | $2.99–3.00 | Zapmail Pro $299 for 100, Saleshandy annual fixed $2.99 |
| Retail DFY | $3.00–3.50 | Mailforge, ScaledMail, Zapmail add-on inboxes |
| Sequencer resale | $4.50–5.00 | Smartlead "Powered by Zapmail" $4.5, Instantly $5, Snov $5 |
Reseller margin. Smartlead's $4.5 on a Zapmail inbox Zapmail itself sells at $3.00–3.50 is a 29–50% markup, or a 22–33% gross margin, before any wholesale discount Smartlead negotiates. On an agency running 1,000 inboxes that is ≥$1,000–1,500/month of gross profit from inboxes alone. Smartlead's top public plan, Unlimited Prime, is $379. On large agency accounts, inbox resale can out-earn the software.
Insurance pricing. Saleshandy prices the same inbox at $2.99 (annual, fixed), $3.49 (annual flexi with free replacement, minimum 25) and $3.99 (quarterly). The 17% premium for replaceability shows how the market prices burn risk: inboxes get flagged, and someone has to eat the replacement.
The cost floor is not Google's list price. Resellers sell Google inboxes at $3, below what Instantly implies Google charges. Microsoft "inboxes" sell at ~$2 effective (ScaledMail: $50/domain for 25 mailboxes) against a $7 Business Basic licence. So the supply side relies on discounts, regional pricing or account structures the platforms may not sanction.
The cheapest inbox supply depends on how Google and Microsoft licence and police these accounts. A policy change can wipe out a reseller's margin, or its inventory, overnight. Read Provider rules: Google, Microsoft and the ESPs, Microsoft rules: Outlook.com and Microsoft 365 limits and Google vs Microsoft vs SMTP before you build a business on resale.
How Zapmail, Mailforge, Maildoso and similar suppliers source Google and Microsoft capacity below list price is not publicly documented. The margin structure behind the $3 inbox is unverified.
What this means for an entrant
- Price software on volume and keep inbox counts free, but meter the expensive things. Dedicated IPs, AI generation and data lookups are where COGS scales. Charge for them explicitly.
- Build the polling and IP layer for cost from day one. Reply detection and IP reputation are the COGS lines that grow with "unlimited inboxes". An efficient push-based architecture (Gmail/Graph push notifications rather than tight IMAP polling) is a real margin lever (Sending architecture).
- Make inbox resale a second P&L line, priced transparently. A 20–30% gross margin on $3 inboxes across a few large agencies is worth more than their subscriptions. Showing the margin openly is a differentiator against Smartlead's "Powered by Zapmail" markup (Infrastructure strategy: build or partner).
- Offer bring-your-own-key AI by default. At $0.0005 per personalised email, tokens are cheap for the customer and dangerous on your P&L under an "unlimited AI" promise.
- Sell agencies the cost per 1,000, not the plan. Agencies think in $/1,000 and $/meeting. Publishing a fully loaded calculator that includes inboxes and data is a sales tool few competitors offer.