How Much Does It Cost to Launch a Cold Email Campaign with Maildoso?
To launch cold email campaigns, you need a reliable email infrastructure. Maildoso makes it easy to buy domains and set up email accounts. In this article, we’ll show you how to calculate the total cost of your cold email setup, step by step.
Key Takeaways
- One Maildoso mailbox costs between $0.49 and $2.80 per month, and the more mailboxes you buy, the cheaper each one gets. There are three basic plans: 30 mailboxes for $75, 300 for $225, and 1,000 for $499. Domains are billed separately at $15 per year each, or you can connect your own.
- Your infrastructure size depends on your contact list and your sales team’s workload. For example, reaching 10,000 contacts takes around 122 mailboxes and 25 domains (~$336 per month), and at average conversion rates that could bring around 158 meetings.
- Mailboxes and domains are only part of the budget. Including the email outreach service (sequencer), contact database purchases, and email address verification, the total monthly budget could be about $250 for 30 mailboxes, $1,000 for 300 mailboxes, and $3,200 for 1,000 mailboxes.
What Is Maildoso?
Maildoso is a platform for building email infrastructure for cold outreach. You can buy domains, create SMTP mailboxes, and export them to your sequencing tool, such as Instantly or Smartlead. The platform also has several features that keep your sending stable and protect your deliverability:
- IP rotation. Emails are automatically distributed across multiple IP addresses. If one runs into issues, sending continues through the others.
- Automatic mailbox recovery. Mailboxes alternate between 14 days of active sending and 14 days of downtime. Underperforming mailboxes get time to recover, and the rest of your infrastructure keeps working.
- Link and image replacement. Maildoso automatically swaps links and images for safer alternatives to reduce the risk of landing in spam.
- Deliverability monitoring. In the Maildoso dashboard, you can track mailbox warm-up in your sequencing tool and check inbox placement with the inbox placement testing feature.
→ Want a step-by-step guide to registering domains and buying mailboxes? See our separate article: Maildoso: What It Is, How It Works, and How to Get Started.
Maildoso Pricing: How Much Do Mailboxes and Domains Cost?
Maildoso offers SMTP mailboxes at competitive prices, starting at $0.49 per mailbox per month. The total depends on how many mailboxes you need, with a minimum purchase of 10. The pricing page lists three popular plans:
| Number of mailboxes | Monthly price | Price per mailbox |
|---|---|---|
| 30 | $75 | $2.5 |
| 300 | $225 | $0.75 |
| 1000 | $499 | $0.49 |
Not sure yet? Maildoso offers a 30-day trial with 300 SMTP mailboxes, so you can test the infrastructure at a realistic sending volume before you commit.
How to Calculate the Number of Mailboxes and Domains You Need
To estimate your infrastructure size, you need two numbers: how many contacts are in your database and how many emails you plan to send to each one. If you don’t have a contact list yet, start by estimating your TAM (total addressable market), the total number of potential customers in your niche. You can do that with B2B databases such as Apollo, Cognism, or Lusha.
Example Calculation
Let’s say your verified contact list has 10,000 potential customers, and you plan to send each one a sequence of four emails (an initial email and three follow-ups).
- Calculate the total number of emails per month.
10,000 contacts × 4 emails = 40,000 emails.
- Determine your daily sending volume. Divide the total number of emails by 22 working days per month.
40,000 ÷ 22 ≈ 1,818 emails per day.
- Calculate the number of mailboxes. Divide your daily email volume by 15, since we don’t recommend sending more than 15 emails per mailbox per day.
1,818 ÷ 15 = 121.2. Round up to 122 mailboxes.
- Calculate the mailbox cost.
$2.50 × 122 = $305 per month, based on Maildoso’s pricing.
- Calculate the number of domains you need. Divide the number of mailboxes by 5, since we recommend no more than five mailboxes per domain.
122 ÷ 5 = 24.4
Round up to 25 domains.
If you already have domains, there’s no need to purchase new ones. You can connect existing domains to Maildoso for free in a few ways: send a CSV file to the support team via live chat on the website, follow the existing domains setup guide in your account, or connect external domains yourself via the API (see the API documentation and the Loom video tutorial).
6. Calculate the domain cost. One domain on Maildoso costs $15 per year.
$15 × 25 = $375 per year, or approximately $31.25 per month.
Total: Maildoso email infrastructure for 10,000 contacts (122 mailboxes and 25 domains) costs approximately $336.25 per month.
What Results Can This Email Infrastructure Deliver?
With 122 mailboxes, you can send the volume you need. Based on average cold email benchmarks, you can estimate results in advance.
According to Instantly’s 2026 Cold Email Benchmark Report, the average reply rate in 2026 is 3.43% of all emails sent.
40,000 emails × 3.43% = 1,372 replies per month.
What matters most is the positive replies. They usually make up around 23% of all replies. The rest are rejections, auto-responses, and messages from people who aren’t interested.
1,372 × 23% = 315.56, or approximately 316 positive replies.
About half of interested prospects go on to book a call with the sales team.
316 × 50% = 158 meetings per month.
💡 Actual results depend on your offer, the quality of your contact list, and your email copy, so treat these numbers as estimates, not guarantees.
How to Calculate the Number of Mailboxes You Need to Hit Your Meeting Target
When you plan a cold email campaign, think not only about your market size but also about your sales team’s capacity. If your TAM runs into millions of contacts, trying to reach everyone in a single month could mean hundreds of hours of follow-up calls, and that’s more than your team can handle. In that case, work backward: decide how many meetings you need per month, then calculate the positive replies, total replies, emails, and, finally, mailboxes.
Example calculation
Let’s say you need 100 meetings per month:
- 100 meetings ÷ 50% = 200 positive replies.
- 200 ÷ 23% (positive reply rate) ≈ 870 total replies.
- 870 ÷ 3.43% (reply rate) ≈ 25,364 initial emails per month.
- 25,364 × 4 emails per sequence = 101,456 emails per month.
- 101,456 ÷ 22 working days ≈ 4,612 emails per day.
- 4,612 ÷ 15 emails per mailbox per day ≈ 308 mailboxes.
- 308 ÷ 5 mailboxes per domain ≈ 62 domains.
Maildoso cost: 308 mailboxes ($231 per month) and 62 domains ($930 per year) total about $308.50 per month.
What Other Costs Should You Consider Besides Maildoso?
Domains and mailboxes cover only your email infrastructure, not the whole cost of a campaign. You’ll also need:
- an email sequencing tool, such as Instantly or Smartlead;
- a lead generation platform, such as Apollo;
- an email verification service, such as NeverBounce or ZeroBounce.
Depending on your project, you may also want extra tools, such as Clay for data enrichment or AI services like Lavender for writing and personalizing emails.
How Much Does a Cold Email Campaign Cost?
To estimate the overall budget, let’s calculate the costs for three Maildoso plans. We’ll assume each mailbox sends 15 emails per day, each lead gets a four-email sequence, and there are 22 working days per month. Monthly lead capacity is calculated as: number of mailboxes × 15 emails × 22 days ÷ 4 emails per lead.
| Maildoso plan | Leads per month | Maildoso (mailboxes and domains) | Email sequencing (Instantly) | Lead generation (Apollo) | Email verification (NeverBounce) | Total |
|---|---|---|---|---|---|---|
| 30 mailboxes | 2,475 | $82.50/mo. | $97 | $49 | ~$40 | ~$248 |
| 300 mailboxes | 24,750 | $300/mo. | $97 | ~$490 | ~$125 (or $99 with subscription) | ~$1,015 (~$986) |
| 1000 mailboxes | 82,500 | $749/mo. | $358 | ~$1,659 | ~$400 (or $159 with subscription) | ~$3,170 (~$2,925) |
Final Thoughts
The 30-mailbox plan lets you reach around 2,475 leads per month, with a total budget of about $269 including sequencing, lead sourcing, and verification. It’s a good starting point to test your offer and launch your first campaign.
The 300-mailbox plan covers about 24,750 leads per month for about $1,012 total. It’s a good fit for a steady lead flow and a small sales team.
The 1,000-mailbox plan can reach around 82,500 leads per month for about $3,166 total. It may suit agencies and teams that run several campaigns at once.
The bigger the plan, the cheaper each lead: around $0.11 on the smallest plan and about $0.04 on the two larger ones. But the best choice isn’t necessarily the biggest plan. It’s the one your sales team can handle. If the standard plans don’t match your needs, you can buy extra mailboxes separately, starting at $0.49 each.
Need help estimating your campaign cost? Book a call, and we’ll help you choose the right setup and calculate your budget.
FAQ
How many mailboxes do I need to get started?
The 30-mailbox starter plan is a good fit for your first campaign: it lets you reach around 2,475 leads per month. The exact number depends on your contact list size and your sales team’s capacity.
Can I purchase a custom number of mailboxes? Can I add more mailboxes and domains later?
Yes. If the standard plans don’t fit, you can buy additional mailboxes in your account on the Packages & Add-ons page. Extra mailboxes start at $0.49 per month.
Is there a free trial?
Yes. Maildoso offers a 30-day trial of 300 SMTP mailboxes. It’s a great way to test deliverability and see how the platform performs at real-world volume. After the trial, the plan costs $225 per month ($0.75 per mailbox), plus domain costs.
Are domains included in the mailbox price?
No. Domains are billed separately at $15 per domain per year. You can also connect your existing domains for free.
Will I keep my domains if I cancel my subscription?
Yes. Domains you buy through Maildoso stay yours even after you cancel.
