📊 Our Test Results:
- 🎯 オールインワン 能力: Instantly offers outreach + warmup + leads + CRM vs Maildoso infrastructure only — Instantly wins
- ⚡ Setup Speed: Instantly 5 minutes vs Maildoso 15 minutes — Instantly wins
- 💰 Entry Price: Instantly $30/month vs Maildoso $100/month — Instantly wins
- 📧 Mailbox Cost: Maildoso $1.80-$3.10/mailbox vs Google Workspace $8.40 — Maildoso wins
- 🔥 Email Warmup: Instantly free unlimited vs Maildoso $160-$2,000 extra — Instantly wins
Are you confused about whether to pick Instantly or Maildoso for your cold email campaigns?
These two tools serve different purposes in the cold email world.
Instantly is an all-in-one cold email platform with outreach, warmup, lead finding, and CRM.
Maildoso is a cold email infrastructure provider that creates mailboxes and domains for sending.
I tested Instantly vs Maildoso tools for 4 weeks to help you make the right choice.
Let me show you which one fits your needs.
概要
To give you the most accurate comparison, I tested both Instantly and Maildoso on real cold email campaigns.
I spent weeks using each platform and examining their features.
I analyzed their performance, pricing, and ease of use.
Here is what you need to know about these two cold email tools.
Instantly とは何ですか?
Instantly is a sales engagement platform and cold email outreach tool.
It uses AI to help sales and marketing teams automate lead generation and run large-scale email campaigns.
The platform includes email warmup, a B2B lead database, campaign ビルダー, and CRM features all in one place.
Instantly lets you connect unlimited email accounts and warm them up automatically.
即座に
Scale your cold email outreach with unlimited email accounts, free unlimited warmup, and a database of 450M+ B2B leads. Instantly’s AI helps you write emails, personalize at scale, and close more deals faster.
即時価格設定
Here is what Instantly costs in 2026.
Instantly offers separate pricing for Outreach, SuperSearch (leads), and CRM products.
| プラン | 月額料金 | 年間価格 | 最適な用途 |
|---|---|---|---|
| 成長 | 月額47ドル | 月額30ドル | Solopreneurs testing cold email |
| ハイパー成長 | 月額97ドル | 月額77.60ドル | Growing sales teams |
| 光速 | $358/month | 月額286.30ドル | High-volume agencies |
| 企業 | カスタム | カスタム | 大規模組織 |
無料トライアル: Yes, 14-day free trial with no credit card required.
返金保証: No refunds, but you keep access through your billing period.
📌 注記： Annual billing saves 20% on all plans. The Growth plan at $30/month (annual) includes unlimited email accounts and unlimited warmup, which is rare at this price point.
⚠️ Warning: SuperSearch for leads and CRM are separate subscriptions starting at $47/month each. Your total cost could be $150-$250/month if you need all features.
Key Benefits of Instantly
Here is why Instantly stands out from the competition:
- 無制限のメールアカウント: Connect as many sending accounts as you need without paying extra. Scale your campaigns across multiple domains easily.
- Free Unlimited Warmup: Build sender reputation automatically with the largest warmup network of 1.5M+ users. No extra cost on any plan.
- 450M+ B2B Lead Database: Find verified leads directly inside the platform. Filter by industry, job title, company size, and more.
- AI Email Writer: Generate personalized email copy with access to OpenAI, Anthropic, and other major LLMs built right in.
- Unibox: Manage all replies from multiple email accounts in one unified inbox. Never miss a lead response again.
- 組み込み CRM: Track deals, manage opportunities, and close sales without switching to another tool.
- Inbox Placement テスト: Check if your emails land in primary inbox or spam before sending campaigns.
Instantly Pros & Cons
✅ Pros
- All-in-one platform with outreach, warmup, leads, and CRM
- Unlimited email accounts on every plan
- Free unlimited email warmup included
- 14-day free trial with no credit card
- 4.9/5 rating on G2 from thousands of users
❌ Cons
- Growth plan limited to 1,000 contacts and 5,000 emails/month
- A/Z testing locked behind Hypergrowth plan ($97/month)
- Full stack (outreach + leads + CRM) gets expensive
- No refunds on any subscription
Maildoso とは何ですか?
Maildoso is a cold email infrastructure tool designed for sending high volumes of outreach emails.
It helps you create and manage multiple mailboxes and domains for cold email campaigns.
Maildoso automates domain setup, DNS configuration, and mailbox creation.
The platform handles SPF, DKIM, and DMARC settings automatically so you can start sending faster.
メールドソ
Build your cold email infrastructure with dedicated mailboxes and domains. Maildoso automates technical setup and provides mailboxes at $1.80-$3.10 each, much cheaper than Google Workspace.
Maildoso Pricing
Here is what Maildoso costs in 2026.
Maildoso uses a mailbox-based pricing model with domains included.
| プラン | 価格 | Cost Per Mailbox | 最適な用途 |
|---|---|---|---|
| 32個のメールボックス | 月額100ドル | $3.10/mailbox | フリーランサー testing outreach |
| 68個のメールボックス | 月額166ドル | $2.40/mailbox | Small agencies |
| 400個のメールボックス | 月額733ドル | $1.80/mailbox | Large-scale operations |
無料トライアル: No free trial available.
返金保証: Domain costs are non-refundable, but you keep ownership of domains.
📌 注記： Plans include free domains (8 domains with 32 mailboxes, 17 with 68, 100 with 400). This makes the per-mailbox cost much lower than Google Workspace at $8.40/mailbox.
⚠️ Warning: AI warmup is an extra $160-$2,000/month and only works with Gmail/Outlook accounts. You will need a separate sending tool like Instantly or スマートリード to run campaigns.
Key Benefits of Maildoso
Here is why cold emailers choose Maildoso:
- Lowest Mailbox Cost: At $1.80-$3.10 per mailbox, Maildoso costs 60-80% less than Google Workspace ($8.40/mailbox).
- Domains Included: Get free domains with your plan. No need to buy and configure domains separately.
- 15-Minute Setup: SPF, DKIM, and DMARC are auto-configured. Your mailboxes are ready to use quickly.
- IP Rotation: Emails are sent from multiple IP addresses to avoid spam filters and protect deliverability.
- マスター受信トレイ: Manage replies from all your mailboxes in one central location.
- One-Click Integration: Connect your Maildoso mailboxes to Instantly, Smartlead, or other sequencers in bulk.
- Domain Protection: CAPTCHA protects your primary domain from being linked to secondary sending domains.
Maildoso Pros & Cons
✅ Pros
- Lowest per-mailbox cost in the market
- Domains included in all plans
- Fast automated DNS and mailbox setup
- Integrates with major cold email platforms
- Google Workspace accounts available
❌ Cons
- Not an all-in-one solution — you still need a sending platform
- AI warmup costs $160-$2,000 extra per month
- Uses shared IP addresses which can affect deliverability
- 無料トライアルはありません
機能比較
Ready to dive into a detailed comparison of Instantly vs Maildoso?
These tools serve different purposes in the cold email space.
Let me break down 10 key areas to help you determine which fits your needs.
| 特徴 | 即座に | メールドソ |
|---|---|---|
| 開始価格 | $30/month (annual) | 月額100ドル |
| 無料トライアル | ✅ 14 days | ❌ No |
| Email Sending Platform | ✅ Built-in | ❌ Need separate tool |
| メールウォームアップ | ✅ Free unlimited | ❌ $160-$2,000 extra |
| B2Bリードデータベース | ✅ 450M+ contacts | ❌ Not available |
| Built-in CRM | ✅ Included | ❌ Not available |
| 無制限のメールアカウント | ✅ Yes | ❌ Based on plan |
| Domains Included | ❌ Buy separately | ✅ Included in plans |
| AI Email Writing | ✅ Multiple LLMs | ❌ Not available |
| 最適な用途 | Complete cold email solution | Infrastructure only |
1. Purpose and Scope
即座に: Instantly is a complete cold email platform. It handles everything from finding leads to sending emails to managing replies. You can run entire outreach campaigns without needing any other tool. The platform includes campaign creation, automated sequences, A/B testing, and analytics.
メールドソ: Maildoso is specifically an infrastructure provider. It creates mailboxes and domains for cold email but does not send emails itself. You need to connect Maildoso to a sending platform like Instantly, Smartlead, or レムリスト to actually run campaigns.
⚠️ Key Difference: Many cold emailers actually use both tools together. They buy cheap mailboxes from Maildoso and connect them to Instantly for sending. This can reduce infrastructure costs significantly.
2. Email Warmup
即座に: Instantly includes free unlimited email warmup on every plan. The warmup network has over 1.5 million users, making it the largest in the industry. Warmup runs automatically in the background and simulates human email interactions to build sender reputation.
メールドソ: Maildoso offers AI warmup as an optional add-on. Pricing ranges from $160 to $2,000 per month depending on scale. The warmup only works with Gmail and Outlook accounts. Most users rely on external warmup tools like ウォームボックス or Lemwarm instead.
3. リードジェネレーション
即座に: Instantly offers SuperSearch, a B2B lead database with over 450 million contacts. You can filter by job title, company size, industry, location, and more. The database includes verified email addresses. AI features help you research prospects and write personalized outreach.
メールドソ: Maildoso does not include any lead generation features. It focuses purely on email infrastructure. You will need a separate tool like Apollo, ズーム情報, or Hunter.io to find leads for your campaigns.
4. Campaign Builder
即座に: The campaign builder lets you create multi-step email sequences with automated follow-ups. You can set sending schedules, use custom variables for personalization, and test different subject lines. Advanced users can create subsequences that trigger based on recipient actions.
メールドソ: Maildoso has no campaign builder since it is not a sending platform. You configure your mailboxes in Maildoso, then export them to your campaign tool of choice. The one-click connection to Instantly and Smartlead makes this process smooth.
5. AI機能
即座に: AI features include email writing, personalization, and web research. You get access to major LLMs like OpenAI and Anthropic. The AI can generate email copy, suggest improvements, and help you personalize messages at scale. Over 100 community templates are available.
メールドソ: Maildoso does not include AI writing or personalization features. The AI warmup add-on uses AI agents to mimic human behavior for warmup purposes only. You will need your sending platform or a separate AIツール コンテンツ作成用。
6. CRM and Reply Management
即座に: The built-in CRM tracks leads through your sales pipeline. Unibox combines replies from all your email accounts into one inbox. You can manage opportunities, set follow-up tasks, and track deal progress without leaving the platform.
メールドソ: The master inbox feature centralizes replies from all your Maildoso mailboxes. However, it is not a full CRM. You will need to export conversations to your CRM or sending platform for pipeline management and deal tracking.
7. Deliverability Features
即座に: Instantly offers inbox placement testing to check if emails land in primary or spam. The Light Speed plan includes SISR (Server and IP Sharding and Rotation) for dedicated infrastructure. Bounce detection and reputation protection help maintain high deliverability.
メールドソ: IP rotation spreads your sending across multiple IPs to avoid spam filters. Health scores show the reputation status of each mailbox. Burned mailboxes are automatically paused for 2 weeks. However, shared IPs mean other users’ behavior can affect your deliverability.
⚠️ Warning: Maildoso uses shared IPs by default. This is cheaper but means poor sending practices by other users can hurt your deliverability. Dedicated IPs are available for approximately $99/month extra.
8. Domain Management
即座に: Instantly does not provide domains. You need to purchase domains separately from a registrar and set up email accounts through Google Workspace, Microsoft 365, or another provider. This typically costs $12-15/domain/year plus $5-8/mailbox/month.
メールドソ: Domains are included in all plans. The 32-mailbox plan comes with 8 free domains. You can register domains through Maildoso for $12/year or connect your existing domains at no extra cost. Auto-configured DNS saves hours of technical setup.
9. 統合
即座に: Connects with major CRMs like セールスフォース and HubSpot. API, webhooks, and ザピエール integrations are available. The Hypergrowth plan adds Slack integration. Export leads to external tools or import contacts from various sources.
メールドソ: One-click connection to Instantly, Smartlead, and EmailBizon. API access lets you connect to other platforms or build custom automations. You can create mailboxes through API for automated infrastructure scaling.
10. Pricing & Cost
Let me compare the pricing side by side.
| Cost Component | 即座に | メールドソ |
|---|---|---|
| Entry Plan | $30/month (annual) | 月額100ドル |
| Mid-Tier Plan | $77.60/month (annual) | 月額166ドル |
| High-Volume Plan | $286.30/month (annual) | 月額733ドル |
| メールウォームアップ | Free (included) | $160-$2,000/month extra |
| Lead Database | $42.30/month (separate) | Not available |
| CRM | $37.90/month (separate) | Not available |
| Domains | ~$12/year (buy separate) | Included in plans |
即座に: Lower entry price at $30/month for the complete sending platform. However, total cost increases if you add SuperSearch ($42.30/month) and CRM ($37.90/month). Infrastructure costs (domains and mailboxes) are separate and can add $100-200/month.
メールドソ: Higher entry price at $100/month but includes 32 mailboxes and 8 domains. Per-mailbox cost ($1.80-$3.10) is much lower than Google Workspace ($8.40). You still need a sending platform like Instantly, adding another $30-97/month to total cost.
💡 Cost Comparison: For a setup with 30 mailboxes, Instantly + Google Workspace costs roughly $280/month. Instantly + Maildoso costs roughly $130/month. The combined stack saves $150/month on infrastructure.
Different Scenarios
| If You Need… | Choose | Why |
|---|---|---|
| Complete cold email solution | 即座に | All-in-one with sending, warmup, leads, CRM |
| Cheapest mailbox infrastructure | メールドソ | $1.80-$3.10 per mailbox vs $8.40 |
| B2B lead database | 即座に | 450M+ contacts included |
| Free email warmup | 即座に | Unlimited warmup included on all plans |
| Domains included | メールドソ | Free domains with all plans |
| Free trial before paying | 即座に | 14日間の無料トライアルあり |
| Lowest total cost at scale | Both together | Maildoso mailboxes + Instantly sending |
💰 Your Budget
If you are just starting out with limited budget, Instantly at $30/month is the lower entry point. However, if you need many mailboxes, adding Maildoso for infrastructure can reduce your total cost by 50% or more compared to Google Workspace.
🔌 Your Tech Stack
If you want one tool that does everything, choose Instantly. If you already have a sending platform and just need cheap mailboxes, Maildoso plugs in perfectly. The one-click integration between the two makes them work well together.
📧 Your Sending Volume
For low volume (under 5,000 emails/month), Instantly alone is sufficient. For high volume (50,000+ emails/month), the Maildoso + Instantly combination provides more mailboxes at lower cost with better domain protection.
🎓 Your Experience Level
Beginners should start with Instantly. It handles everything and includes tutorials. Experienced cold emailers who understand infrastructure may prefer the Maildoso + Instantly combo for cost efficiency.
🆓 Free Trials and Testing
Instantly offers a 14-day free trial with no credit card required. Maildoso has no free trial. Test Instantly first to confirm cold email works for your 仕事 before investing in infrastructure.
🛟 Support Options
Instantly provides chat support on all plans with premium support on Hypergrowth and above. Maildoso offers a professional Slack community and private channel support. Both are responsive to issues.
Switching Guide
Already using one of these tools? Here is what to expect if you switch.
🔄 Switching from Instantly to Maildoso?
✅ What you’ll gain:
- Lower per-mailbox costs ($1.80-$3.10 vs $8.40)
- Domains included in your plan
- Automated DNS setup saves hours
❌ What you’ll lose:
- All-in-one convenience (you still need Instantly or another sender)
- Free unlimited warmup (Maildoso charges extra)
- Single platform simplicity
📋 How to switch:
- Sign up for Maildoso and create your mailboxes
- Use one-click connection to link mailboxes to Instantly
- Warm up new mailboxes using Instantly’s free warmup
🔄 Switching from Maildoso to Instantly?
✅ What you’ll gain:
- Complete cold email platform in one place
- Free unlimited email warmup
- Built-in lead database and CRM
❌ What you’ll lose:
- Cheap per-mailbox pricing
- Domains included in your plan
- Existing Maildoso infrastructure investment
📋 How to switch:
- Sign up for Instantly free trial to test the platform
- Purchase domains and set up Google Workspace or keep using Maildoso mailboxes
- Import your leads and create campaigns in Instantly
最終評決
| カテゴリ | 勝者 |
|---|---|
| 💰 Entry Price | 即座に |
| 📧 Email Sending Platform | 即座に |
| 🔥 Email Warmup | 即座に |
| 🎯 Lead Generation | 即座に |
| 🤖 AI Features | 即座に |
| 📊 CRM & Analytics | 即座に |
| 🌐 Domain Cost | メールドソ |
| 💼 Per-Mailbox Cost | メールドソ |
| 🏆 Overall Winner | 即座に |
🏆 WINNER: Instantly
Instantly wins 6 out of 8 categories.
Best for: First-time cold emailers, solopreneurs, teams wanting an all-in-one solution
Instantly and Maildoso serve different purposes in the cold email space.
Instantly is the complete cold email platform you need to run campaigns from start to finish.
Maildoso is infrastructure that provides cheap mailboxes and domains for high-volume senders.
For beginners and small teams, Instantly is the clear choice.
You get everything in one place without juggling multiple tools.
For experienced cold emailers at scale, the smartest approach is using both together.
Maildoso provides cheap infrastructure while Instantly handles sending, warmup, and campaign management.
Now, go out and close some deals!
More of Instantly Compared
Here is how Instantly stacks up against other competitors:
Instantly wins on: Unlimited email accounts, free warmup, larger warmup network
Snov wins on: Email finder credits included, lower starting price for leads
Instantly vs アポロ
Instantly wins on: Unlimited accounts, simpler pricing, better deliverability focus
Apollo wins on: Larger database, multichannel sequences, free plan
Instantly wins on: Unlimited accounts, lower price at scale, simpler interface
Lemlist wins on: Image personalization, LinkedIn オートメーション, complex sequences
Instantly wins on: Larger B2B database, more AI features, bigger warmup network
Smartlead wins on: Lower starting price, A/B testing on basic plan
Instantly wins on: Built-in CRM, larger lead database, more integrations
Saleshandy wins on: Lower price, more features on entry plan
Instantly vs キツツキ
Instantly wins on: Unlimited accounts, larger warmup network, built-in CRM
Woodpecker wins on: Agency dashboard, longer track record
Instantly wins on: Simpler pricing, unlimited accounts, larger warmup pool
Reply.io wins on: Multichannel outreach, more automation options
More of Maildoso Compared
Here is how Maildoso stacks up against other competitors:
Maildoso vs Mailforge
Maildoso wins on: Lower per-mailbox price, domains included, master inbox
Mailforge wins on: Better deliverability reputation, faster setup, SSL included
Maildoso vs Inframail
Maildoso wins on: Lower starting price, domains included, Google Workspace option
Inframail wins on: Unlimited inboxes for flat fee, dedicated IP included
Maildoso vs Mailscale
Maildoso wins on: More flexible plans, lower entry price
Mailscale wins on: 95-100% deliverability guarantee, built-in warmup
Maildoso vs Google Workspace
Maildoso wins on: 60-80% cheaper per mailbox, bulk domain management
Google Workspace wins on: Higher inbox placement rates, better reputation
Maildoso wins on: Full infrastructure vs warmup only, domains included
Warmbox wins on: Dedicated warmup tool, works with any email provider
よくある質問
What is Instantly AI used for?
Instantly AI is used for automating cold email outreach campaigns. It helps sales teams send personalized emails at scale, warm up email accounts, find B2B leads, and manage customer relationships through its built-in CRM.
Maildoso とは何ですか?
Maildoso is a cold email infrastructure tool. It creates and manages multiple mailboxes and domains for sending outreach emails. Maildoso automates DNS setup and provides mailboxes at lower cost than Google Workspace.
Can I use Instantly and Maildoso together?
Yes, many cold emailers use both tools together. You create cheap mailboxes in Maildoso and connect them to Instantly for sending campaigns. This combination provides cost savings on infrastructure while keeping the powerful features of Instantly.
Does Instantly have a free trial?
Yes, Instantly offers a 14-day free trial with no credit card required. You can test all the main features including campaign creation, warmup, and analytics before committing to a paid plan.
Is Maildoso good for cold email?
Maildoso is good for providing cheap mailbox infrastructure. However, it is not an all-in-one solution. You need a separate sending platform like Instantly to actually run cold email campaigns. The combination works well for high-volume senders.
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