SmartSenders is the mailbox marketplace inside Smartlead: you buy domains and Google, Outlook or SMTP mailboxes from third-party vendors without leaving Smartlead, on Smartlead's bill. As of October 2026 its pricing page lists fresh mailboxes at $3.99 to $5 per month and pre-warmed ones at $9, plus $13 to $19 per domain per year, and Smartlead's help center says they cannot be transferred or used outside Smartlead. Winnr mailboxes export to Smartlead in a ready-made CSV and cost $1.38 each at 50 ($69/month) and $0.95 each at 200 ($189/month). Choose SmartSenders for Google or Outlook mailboxes bought in two clicks inside Smartlead. Choose Winnr for a lower price per mailbox and mailboxes you can take to another sequencer.
Facts about SmartSenders below come from smartlead.ai and Smartlead's help center, read on October 6, 2026, plus two third-party reviews where we say so. Winnr's prices are on the public pricing page. Smartlead is one of the sequencers Winnr exports to.
What SmartSenders is
Smartlead describes SmartSenders as a "seamless experience to buy and setup your favourite Google, Outlook, and SMTP mailboxes in 2 clicks". Its help center says you purchase domains and email accounts "through Smartlead's marketplace from different ESPs", from pre-vetted vendors, with SPF, DKIM and DMARC configured automatically. Each option on the pricing page is labelled with the vendor that powers it.
Two outside reviews describe it the same way. InboxKit, which is itself one of the vendors, calls SmartSenders "a procurement layer inside the Smartlead sequencer that resells mailboxes from third-party providers", with Smartlead handling checkout, connection and billing while the vendor supplies the mailboxes and DNS. Growth Hack Suite's review (which uses affiliate links) notes that the mailboxes arrive configured but still need warmup before a real campaign.
SmartSenders vendors and prices as of October 2026
From the SmartSenders section of smartlead.ai/pricing. Mailboxes are billed monthly and domains yearly.
| Mailbox type | Powered by | Per mailbox / month | Per domain / year |
|---|---|---|---|
| Google, fresh | Zapmail | $4.50 | $13 |
| Google, with admin access | Zapmail | $4.50 | $13 |
| Outlook, fresh | Zapmail | $4.50 | $13 |
| Outlook, fresh | InfraInbox | $5.00 | $16 |
| SMTP, fresh | Mailreef | $3.99 | $19 |
| SMTP | AeroSend | $4.20 | $13 |
| Google, pre-warmed | Zapmail | $9.00 | $18 |
| Outlook, pre-warmed | Zapmail | $9.00 | $18 |
The help center adds two options not in that table: Google or Outlook mailboxes from InboxKit at $4.50 per mailbox and $13 per domain, and Smartlead's own pre-warmed mailboxes at $9 per mailbox and $18 per domain, 3 per domain, delivered in 1 to 2 hours. Smartlead's help articles do not always agree with each other or with the pricing page (one Zapmail article lists $4 per mailbox and $15 per domain), so the price at checkout is the one that counts.
Smartlead's own plans are separate. As of October 2026 they are $39 (Base), $94 (Pro), $174 (Unlimited Smart) and $379 (Unlimited Prime) per month on monthly billing, and the pricing page advertises unlimited email warmups.
Rules worth knowing before you buy
All from Smartlead's help center:
- Smartlead only. "Domains and mailboxes bought through SmartSenders can't be transferred and used outside of Smartlead."
- Paid plan required. You cannot buy domains or mailboxes on the 14-day free trial.
- Setup time. Typically 24 to 48 hours for fresh mailboxes; 1 to 2 hours for Smartlead's pre-warmed mailboxes.
- Deleting is per domain. Deleting a mailbox applies to every mailbox on its domain. SmartSenders mailboxes go into a pending-deletion state and keep working until a day before the billing cycle ends, and unused days are not refunded.
- No vendor switching for active domains. The add-mailboxes option is for domains bought through SmartSenders, and InfraInbox and pre-warmed domains cannot take extra mailboxes after purchase.
- Vendor limits. Mailreef through SmartSenders has a minimum order of 15 domains with 5 mailboxes each (75 mailboxes), no bringing your own domains, a 14-day warmup and 20 cold plus 20 warm emails per mailbox per day. InfraInbox Outlook orders are 2 to 20 domains with 3 to 5 mailboxes each, recommend 14 days of warmup and 10 to 15 emails a day (20 at most), and single mailboxes cannot be deleted. Zapmail allows 1 to 5 mailboxes per domain and recommends 15 to 20 emails a day after warmup (per Smartlead's help center).
Using Winnr mailboxes in Smartlead
Winnr sells SMTP/IMAP mailboxes on its own sending infrastructure, with domains, DNS, warming and a universal inbox in one dashboard. In Winnr you open Email Users, choose Export, pick the Smartlead format and download a CSV; in Smartlead you open Email Accounts and use the bulk CSV upload for SMTP accounts. The file has no daily-limit column, so set 10 to 20 cold emails per mailbox in Smartlead. Step-by-step: connect Winnr mailboxes to Smartlead, or see cold email inboxes for Smartlead for the overview.
Mail you send from Smartlead through a Winnr mailbox goes out through Winnr's servers, including through a dedicated IP if your account has one. Our article on dedicated IPs on Smartlead vs Winnr explains which IP actually carries your mail in each setup.
Cost at 50, 200 and 1,000 mailboxes
Monthly cost of the mailboxes only. Your Smartlead plan is the same either way, so it is left out. SmartSenders prices are flat, so mailboxes × price (200 × $4.50 = $900). Winnr is the plan price plus $1 for each mailbox above it.
| Mailboxes | Winnr | Google or Outlook ($4.50) | SMTP, Mailreef ($3.99) | SMTP, AeroSend ($4.20) | Pre-warmed ($9) |
|---|---|---|---|---|---|
| 50 | $69 (Startup) | $225 | $299.25 (75-mailbox minimum) | $210 | $450 |
| 200 | $189 (Enterprise) | $900 | $798 | $840 | $1,800 |
| 1,000 | $989 ($189 + 800 × $1) | $4,500 | $3,990 | $4,200 | $9,000 |
Domains. At 5 mailboxes per domain you need 10, 40 and 200 domains. On SmartSenders' $13 tier that is $130, $520 and $2,600 a year; Mailreef's $19 tier and its 15-domain minimum make it $285, $760 and $3,800 a year. Through Winnr it is a one-time $130, $455 (Enterprise includes 5 free domain purchases) and $2,535 at about $13 per .com, and connecting domains you already own is free. Winnr allows up to 10 mailboxes per domain if you want fewer domains.
Warming. Smartlead plans include unlimited warmup, and you can use it on Winnr mailboxes too. Winnr's built-in warming is $0.60 per mailbox per month if you would rather warm in Winnr; use one or the other per mailbox. Winnr's pre-warmed mailboxes are $3 per address per month against $9 on SmartSenders.
Monthly cost per 1,000 daily cold sends
What you pay each month for every 1,000 cold emails you can send per day: monthly price per mailbox ÷ cold emails per mailbox per day × 1,000. We use each vendor's own guidance from Smartlead's help center, at the top of its range, and Winnr's default of 15 a day (its range is 10 to 20 cold per mailbox).
| Option | Per mailbox / month | Cold emails / mailbox / day | Monthly cost per 1,000 daily cold sends |
|---|---|---|---|
| Winnr, 50 mailboxes | $1.38 | 15 | $92.00 |
| Winnr, 200 mailboxes | $0.95 | 15 | $63.00 |
| Winnr, 1,000 mailboxes | $0.99 | 15 | $65.93 |
| SmartSenders SMTP (Mailreef) | $3.99 | 20 | $199.50 |
| SmartSenders Google or Outlook (Zapmail) | $4.50 | 20 | $225.00 |
| SmartSenders Outlook (InfraInbox) | $5.00 | 15 | $333.33 |
Winnr: 200 mailboxes at 15 a day, $189 a month on Enterprise, 40 domains. SmartSenders Mailreef: 150 mailboxes at 20 a day, $598.50 a month, 30 domains at $19 a year. SmartSenders Zapmail Google: 150 mailboxes at 20 a day, $675 a month, 30 domains at $13 a year. Your Smartlead plan is the same in each case.
When SmartSenders is the better fit
- You want Google or Outlook mailboxes, including options with admin access. Winnr does not sell Google Workspace or Microsoft 365 accounts.
- You want everything on one Smartlead invoice and mailboxes that appear in Smartlead already connected, with no CSV step.
- You only ever send from Smartlead, so the Smartlead-only rule costs you nothing.
- You want pre-warmed Google or Outlook mailboxes delivered within hours.
- You need a very small order. One Zapmail domain with 5 mailboxes is $22.50 a month plus $13 a year, less than Winnr's $69 Startup plan.
When Winnr is the better fit
- Price. 50 Winnr mailboxes cost $69 a month against $210 or more for 50 fresh SmartSenders mailboxes; 200 cost $189 against $798 or more.
- Portability. Winnr exports to Smartlead, Instantly, EmailBison, PlusVibe and 20+ other sequencers, so changing tools does not mean rebuilding your infrastructure.
- Your own domains. Connecting a domain you already own is free on Winnr, and it stays at your registrar.
- Mailbox-level control. Add or delete individual mailboxes, up to 10 per domain, from the dashboard, the REST API or the MCP server.
- Pre-warmed for less: $3 per address per month with no minimum term, and a health score and blocklist check on every listing.
- A refund route. Winnr's 90% deliverability guarantee: if your mailboxes aren't reaching 90% deliverability, ask and Winnr refunds your most recent month.
For more on how SMTP mailboxes compare with Google and Microsoft inboxes, read SMTP for cold email. Other comparisons: Winnr vs Zapmail, Winnr vs Mailreef, Winnr vs InboxKit, Instantly's own email accounts vs Winnr, and all Winnr alternatives.
Frequently asked questions
What is Smartlead SmartSenders?
SmartSenders is the mailbox marketplace inside Smartlead. You buy domains and Google, Outlook or SMTP mailboxes from third-party vendors such as Zapmail, Mailreef, InfraInbox, AeroSend and InboxKit without leaving Smartlead, and they are billed through Smartlead and connected to your account automatically.
How much do SmartSenders mailboxes cost?
As of October 2026, Smartlead's pricing page lists mailboxes at $3.99 (Mailreef SMTP, fresh), $4.20 (AeroSend SMTP), $4.50 (Zapmail Google or Outlook) and $5 (InfraInbox Outlook) per month, and pre-warmed Google or Outlook mailboxes at $9 per month. Domains are $13 to $19 per year. A paid Smartlead plan is also required.
Can I use SmartSenders mailboxes outside Smartlead?
No. Smartlead's help center says domains and mailboxes bought through SmartSenders cannot be transferred and used outside of Smartlead. Winnr mailboxes can be exported to Smartlead and 20+ other sequencers.
Can I use Winnr mailboxes in Smartlead?
Yes. In Winnr, export your mailboxes in the Smartlead format and download the CSV, then upload it in Smartlead with the bulk CSV upload for SMTP accounts. Set each mailbox's daily limit in Smartlead to 10 to 20 cold emails.
Is Winnr cheaper than SmartSenders?
Yes, per mailbox and per email sent. 50 Winnr mailboxes cost $69 a month ($1.38 each) and 200 cost $189 ($0.95 each), against $3.99 to $5 per fresh SmartSenders mailbox. At each vendor's own daily guidance, Winnr comes to $63 to $92 per 1,000 daily cold sends against $199.50 for SmartSenders' cheapest SMTP option.
Do SmartSenders mailboxes need warmup?
Fresh ones do. Smartlead's help center asks for a 14-day warmup on Mailreef and InfraInbox mailboxes and about 2 weeks on Zapmail mailboxes. Pre-warmed mailboxes are sold ready to send. Winnr mailboxes also need at least 2 weeks of warming before cold sending, unless you buy pre-warmed ones.
About this comparison. Winnr publishes this page. SmartSenders facts were checked on October 6, 2026 at smartlead.ai/pricing (vendor prices and plans) and Smartlead's help center: SmartSenders pricing, FAQs, Mailreef, InfraInbox, Zapmail, InboxKit, pre-warmed mailboxes, deleting mailboxes, adding mailboxes to a domain and the free trial. Third-party descriptions: InboxKit's review (updated September 6, 2026) and Growth Hack Suite's review (last modified August 10, 2026). Prices are in USD, before tax, and change often, so check each provider's site before you buy. If something here is out of date, email info@winnr.app and we will correct it.