Cold email tools with unlimited mailboxes (2026)
9 sender plans that include unlimited email accounts, cheapest first, plus the plans that cap them.
Short answer: 9 sender plans in our data include unlimited mailboxes. The cheapest is Smartlead Base at $39/mo, then Instantly Growth (Outreach) at $47/mo and Reply.io Email Volume (entry) at $59/mo. Lemlist, Reply.io, Saleshandy, Woodpecker cap mailboxes on some or all plans. Last updated .
| Tool | Plan | Monthly | Annual $/mo | Contacts | Cost: 1 seat, 20 mailboxes, 1,000 contacts | Notes |
|---|---|---|---|---|---|---|
| Smartlead | Base | $39/mo | $32 | 2,000 | $39.00 | Unlimited email accounts. 50% off first month promo shown. |
| Instantly | Growth (Outreach) | $47/mo | $37.6 | 1,000 | $47.00 | Unlimited email accounts & warmup. |
| Reply.io | Email Volume (entry) (unverified) | $59/mo | $49 | 1,000 | $59.00 | Page shows a price ladder ($49...$899) tied to active-contact tiers; compare table says 'Starts from $59' from 1,000 contacts. Exact tier-to-contacts mapping not readable. Unlimited mailboxes (fair use). |
| Lemlist | $69/mo/seat | $55 | Unlimited | $69.00 | $69 struck to $55 (annual). Unlimited users & senders listed, but FAQ says pricing is based on number of users and email volume is selectable - per-user/volume model partly unverified. | |
| Smartlead | Pro | $94/mo | $78 | 30,000 | $94.00 | |
| Instantly | Hypergrowth (Outreach) | $97/mo | $77.6 | 25,000 | $97.00 | Page lists 125,000 emails on the plan card and 100,000 in the feature table (internal inconsistency). Same page also shows a $358 'Hypergrowth' inside bundles. |
| Smartlead | Unlimited Smart | $174/mo | $144 | Unlimited | $174.00 | Unlimited contacts. |
| Instantly | Light Speed (Outreach) | $358/mo | $286.3 | 100,000 | $358.00 | Includes SISR dedicated IP rotation. |
| Smartlead | Unlimited Prime | $379/mo | $315 | Unlimited | $379.00 | 3 SmartServers + 3 client workspaces included. |
List prices, monthly billing, add-ons excluded. Amber = unverified.
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Plans that cap mailboxes
| Tool | Plan | Price | Mailboxes included | Extra mailbox | Cost: 1 seat, 20 mailboxes, 1,000 contacts |
|---|---|---|---|---|---|
| Lemlist | Multichannel | $109/mo/seat | 5 per seat | not listed | over the cap |
| Reply.io | Multichannel (unverified) | $99/mo/seat | 5 per seat | not listed | over the cap |
| Saleshandy | Starter | $41/mo | 10 | not listed | over the cap |
| Saleshandy | Pro | $99/mo | 100 | not listed | $99.00 |
| Saleshandy | Scale | $189/mo | 1,000 | not listed | $189.00 |
| Woodpecker | Usage-based (per contacted prospect) (unverified) | $0.07 per contacted prospect | 4 | $5/mo each | $150.00 |
Saleshandy's pricing page says you can connect unlimited email accounts; the caps shown are its sender-rotation limits, which is what our cost model uses. "Over the cap" means the plan cannot run 20 mailboxes at list price.
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Frequently asked questions
Which cold email tool has unlimited email accounts?
9 sender plans in our data include unlimited mailboxes. The cheapest is Smartlead Base at $39/mo, then Instantly Growth (Outreach) at $47/mo and Reply.io Email Volume (entry) at $59/mo. Lemlist, Reply.io, Saleshandy, Woodpecker cap mailboxes on some or all plans.
What does 20 mailboxes cost?
For 1 seat, 20 mailboxes and 1,000 contacts a month: Smartlead Base $39.00; Instantly Growth (Outreach) $47.00; Reply.io Email Volume (entry) $59.00; Lemlist Email $69.00. Capped plans cost more or do not fit; see the second table.
Is "unlimited mailboxes" really unlimited?
Read the notes column. Reply.io says fair use, Lemlist prices by user, and sending volume or contact limits still apply on every plan.
Why is Apollo not listed?
Apollo is a data and sending platform; its per-seat mailbox limits are not modeled in our data, so we leave it out rather than guess.
Price changes, before your renewal.
One email a month when Instantly, Smartlead, Apollo, Clay, Lemlist, Reply.io, Saleshandy or Woodpecker change pricing or policies.
This placement is available. Clearly labeled, never mixed into rankings or data.