⚡ Quick Verdict:
- 価格: Instantly starts at $30/month vs Maildoso at $100/month for 32 mailboxes.
- 最適な用途: Instantly for complete cold email outreach; Maildoso for cold email infrastructure only.
- 主な違い： Instantly is an all-in-one sales engagement platform; Maildoso is a cold email infrastructure provider with no built-in outreach tools.
- Our pick: Instantly for most users because it bundles unlimited email accounts, unlimited email warmup, and a B2B lead database in one platform.
Choosing between Instantly and Maildoso comes down to one 質問.
Do you need a complete cold email platform or just email infrastructure?
Instantly handles everything from sending accounts to campaign analytics.
Maildoso only sets up email accounts and domains for you.
You still need a separate cold emailing tool to run outreach campaigns with Maildoso.
This guide breaks down which tool fits your business needs.
概要
This Instantly vs Maildoso comparison covers pricing, key features, and cold email deliverability.
We also explain who each tool works best for.
Our sources include published specs, documentation, and G2 reviews from real users.
By the end, you will make an informed decision on which platform fits your cold outreach goals.
Both tools surface the data sales teams need to make informed decisions about cold email infrastructure.
Instantly とは何ですか?
Instantlyは、営業活動を促進するプラットフォームであり、コールドメールによる新規顧客開拓ツールです。
It uses AI to help sales and marketing teams automate lead generation.
Instantly lets you run large-scale email campaigns and boost email deliverability.
The platform combines unlimited email accounts, unlimited email warmup, and a B2B lead finder.
Most Instantly users choose it to send thousands of personalized emails per day.
Instantly turns leads into booked meetings through smart scheduling and automated follow ups.
🏆 勝者：Instantly
Instantly bundles unlimited email accounts, unlimited email warmup, and a B2B lead database. The warmup pool serves over 1.5 million users.
即時価格設定
Here is what Instantly costs in 2026. Let us break it down.
| プラン | 価格 | 最適な用途 |
|---|---|---|
| 成長 | 月額30ドル | Solo founders sending cold emails |
| ハイパー成長 | 月額77.60ドル | Sales teams scaling outreach campaigns |
| 光速 | 月額286.30ドル | Agencies running separate campaigns |
| 企業 | カスタム | Large teams on the enterprise plan with custom email marketing needs |
Pricing verified March 2026.
無料トライアル: Yes, 14-day free trial. No credit card needed to test the Growth plan.
返金保証: No formal refund policy. Cancel anytime to stop billing.
📌 注記： The Growth plan at $30 per month includes unlimited email warmup and unlimited email accounts. Users have reported saving over $10,000 per year on warm-up alone after switching to Instantly.
⚠️ 警告： The B2B lead finder with verified leads is a separate add-on. The Growth plan covers sending and warmup only.
Instantlyの主なメリット
Here is what makes Instantly worth considering:
- 無制限のメールアカウント: Connect unlimited email accounts for outreach. Inbox rotation spreads sending volume across all your sending accounts to protect your sender reputation.
- 無制限のメールウォームアップ： The warmup pool has over 1.5 million users. This makes it the largest peer-to-peer deliverability network for avoiding spam filters.
- B2Bリードデータベース： The optional SuperSearch add-on gives access to 160 million B2B contacts. You can filter potential clients by industry, role, and LinkedIn URL.
- 統合受信トレイ（Unibox）： Manage all campaign replies from one master inbox. This lets you respond fast and close deals without switching between email accounts.
- AI機能: AI アシスタント writes email content, subject lines, and full sequences. Custom variables and conditional logic enable personalized emails at scale.
- キャンペーン分析: Track response rates, open rates, and reply categories. The AI marks leads by intent to surface hot prospects fast, and advanced automations route them into separate campaigns.
- Zapierとの連携： Connect Instantly to your CRM and other sales engagement tools. Native integrations cover most popular email providers, and more features unlock on higher plans.
What Our Team Noticed
私たちの 作家 signed up for Instantly and spent several days exploring the platform. Here is what stood out from that hands-on time:
即座にメリットとデメリット
✅ メリット
- Unlimited email accounts and unlimited email warmup on every paid plan
- Largest peer-to-peer deliverability network with 1.5M+ warmup pool users
- Built-in B2B lead finder with access to 160M+ verified leads
- AI features generate subject lines, email content, and full sequences
❌ デメリット
- Email personalization is more basic compared to SmartReach IO
- Campaign builder offers simpler linear sequences than Lemlist
- Relies on third-party integrations rather than native CRM connectors
Maildoso とは何ですか?
Maildoso is a cold email infrastructure provider built for outreach at scale.
It sets up email accounts, sending domains, and DNS records for cold email marketers.
The tool handles SPF, MX, and DKIM configurations automatically.
Maildoso has over 2,000 customers using it for cold email infrastructure.
Most users pair Maildoso with a separate cold email outreach tool like Instantly or Smartlead.
The platform helps you protect your primary business domain with lookalike domains.
メールドソ
Maildoso automates domain setup, mailbox creation, and IP rotation. It is a budget-friendly option compared to Google Workspace.
Maildosoの価格設定
Here is what Maildoso costs in 2026. The pricing structure scales with how many mailboxes you need.
| プラン | 価格 | 最適な用途 |
|---|---|---|
| 32 Mailboxes (Small Package) | 月額100ドル | Solo cold emailers and one domain |
| 68 Mailboxes (Starter Package) | 月額166ドル | Three domains and growing teams |
| 400 Mailboxes (Agency Pack) | 月額733ドル | Agencies managing five domains and more inboxes |
Pricing verified March 2026.
無料トライアル: No free trial. Maildoso pricing small package starts at $100/month upfront.
返金保証: No standard refund policy. Pricing model requires a 3-month upfront payment.
📌 注記： Maildoso pricing structure is considered low cost compared to other cold email infrastructure providers. The starter package starts at $99 for three months and scales by inboxes.
⚠️ 警告： The AI warm-up feature of Maildoso is an extra cost. It ranges from $160 to $2,000 per month depending on scale.
Maildosoの主な利点
Here is what makes Maildoso worth considering:
- 無制限のメール受信トレイ: Spin up as many mailboxes as your plan allows. The unlimited plan tier scales for high-volume cold email outreach.
- 一括ドメイン管理: Manage multiple domains and own domains from the main site. Maildoso simplifies bulk domain setup for outreach campaigns.
- マスター受信トレイ: The master inbox brings replies from multiple email accounts into one primary inbox. It keeps conversation history in one place.
- 自動DNS設定： Maildoso automates DNS setup, mailbox creation, and IP address rotation. This avoids common technical setup issues with SPF, MX, and DKIM.
- IPローテーション： The platform rotates IP addresses across mailboxes for deliverability optimization. This helps emails get delivered reliably and stay out of the spam folder.
- ドメイン転送: Domain forwarding lets you point lookalike domains to your main site. This protects your primary business domain during cold email campaigns.
- API アクセス: The API access lets you connect Maildoso to your favorite email client and other cold emailers tools. Native links to Instantly and Smartlead make setup user friendly.
What Our Team Noticed
Our writer signed up for Maildoso and tested the domain setup workflow. Here is what stood out:
Maildosoの長所と短所
✅ メリット
- Cost effective alternative to Google Workspace and Microsoft 365
- Automated domain setup, mailbox creation, and DNS records (SPF, DKIM)
- Master inbox manages replies from multiple email accounts in one place
- Cost savings on bulk inbox setup compared to other email providers
❌ デメリット
- No built-in email warmup feature, which is crucial for avoiding spam filters
- Uses shared IPs that can cause inconsistent deliverability from other users
- Customer support reported as slow for urgent issues
機能比較
Ready to dive into a detailed Instantly vs Maildoso comparison?
We will explore 10 key features to help you find the best tool for your cold outreach needs.
| 特徴 | 即座に | メールドソ |
|---|---|---|
| 開始価格 | 月額30ドル | 月額100ドル |
| 無料トライアル | ✅ 14日間 | ❌ |
| 無制限のメールアカウント | ✅ | ✅ (per plan) |
| 無制限のメールウォームアップ | ✅ 含まれています | ❌ Extra cost ($160-$2K/mo) |
| キャンペーンビルダー | ✅ | ❌ |
| B2Bリードデータベース | ✅ 160M contacts | ❌ |
| マスター受信トレイ | ✅ ユニボックス | ✅ マスター受信箱 |
| AI機能 | ✅ Subject lines, sequences | ❌ |
| 専用IP | ❌共有済み | ❌ Shared (3 dedicated IPs option) |
| ドメイン管理 | 限定 | ✅ Bulk lookalike domains |
| 最適な用途 | Complete cold email outreach | コールドメールインフラストラクチャのみ |
1. 目的と範囲
即座に: Instantly is a complete sales engagement platform for cold email campaigns. It handles sending accounts, automated outreach, the campaign builder, and reply management in one product. You can run separate campaigns, mark leads by intent, and track response rates from a single dashboard.
メールドソ: Maildoso is a cold email infrastructure provider, not a cold emailing tool. It provides mailboxes and sending domains but does not run outreach campaigns itself. Cold email marketers connect Maildoso to a separate platform to send emails.
2. Unlimited Email Accounts and Inbox Rotation
即座に: Every plan includes unlimited email accounts for outreach. With unlimited accounts and inbox rotation, sending emails spreads across all your sending accounts within a single campaign. This protects sender reputation and lets you send thousands of emails without hitting per-account limits.
メールドソ: Maildoso provides unlimited inboxes capped by plan tier. The starter package offers 32 mailboxes; the agency pack gives 400. IP rotation across multiple email accounts helps avoid spam filters during cold email outreach.
3. Email Warmup and Sender Reputation
即座に: The warmup feature is built in and unlimited on every paid plan. The deliverability network includes over 1.5 million users, making it the largest peer-to-peer warmup pool. The warm up simulates human-like conversations to build sending reputation and dodge the spam folder.
メールドソ: Maildoso lacks a built-in email warmup feature on standard plans. The AI-powered warmup is an extra cost ranging from $160 to $2,000 per month. Without warmup, cold emails risk hitting spam folders before building sender reputation.
⚠️ 警告： Email warmup is crucial for cold email campaigns to build a positive sending reputation. Maildoso’s missing built-in warmup is one of the biggest tradeoffs versus Instantly.
4. Lead Generation and B2B Lead Database
即座に: The Instantly lead finder taps a B2B lead database of 160M+ contacts via SuperSearch. You can filter verified leads by industry, role, LinkedIn URL, and revenue. The lead lists feed directly into outreach campaigns to scale your outreach.
メールドソ: Maildoso does not provide lead generation tools. You bring your own lead lists from third-party sources. The platform focuses on email infrastructure rather than finding potential clients.
5. Campaign Builder and Automated Outreach
即座に: The campaign builder uses smart scheduling and conditional follow ups. Custom variables enable personalized emails at scale. You can set up automated outreach with separate campaigns for different sales strategies and book meetings around the clock.
メールドソ: Maildoso has no campaign builder. You pair it with a separate cold email tool like Instantly or Smartlead to run email campaigns. This adds another subscription cost but gives more control over your stack.
6. AI Features and Personalization
即座に: その AIアシスタント writes subject lines, full email content, and entire sequences. Custom variables and conditional logic create personalized emails for each recipient. AI categorizes replies by intent, which speeds up early-stage conversations and helps close deals faster.
メールドソ: Maildoso offers no AI features for writing or personalization. The platform focuses purely on email infrastructure. You handle email content in your separate outreach tool.
7. 受信トレイと返信の統合管理
即座に: The unified inbox is called Unibox. It pulls every reply from every email account into one feed. The AI marks leads as interested, not now, or unsubscribed so you can respond to hot prospects first.
メールドソ: The master inbox displays all replies from all mailboxes in one view. You can track conversation history per recipient. The master inbox lacks AI-based reply classification you get from Instantly’s Unibox.
8. Email Deliverability and Spam Filters
即座に: Email deliverability comes from the 1.5M+ warmup pool plus integrated email validation. The warmup simulates email opens and reads to build sending reputation. Users have reported getting 2-5 meetings every day after setting up their first Instantly campaign.
メールドソ: Maildoso uses shared IPs, which can cause inconsistent deliverability depending on other users on the same IP address. Three dedicated IPs are available as an upgrade for better deliverability. Without the built-in warmup, sender reputation builds slower.
⚠️ 警告： Cold email infrastructure providers like Maildoso depend on shared IPs by default. Three dedicated IPs cost extra and shared IPs can drag down high deliverability.
9. Domain Management and Setup
即座に: Instantly connects to email accounts you already own through Google Workspace or Microsoft 365. You handle domain setup outside the tool. The platform does not bulk-provision lookalike domains for you.
メールドソ: Maildoso handles domain setup and mailbox creation automatically. The small package covers one domain, the starter package covers three domains, and the agency pack covers five domains. Domain forwarding redirects lookalike domains to your main site for brand protection.
10. Integrations and API Access
即座に: Standout features include ザピエール integration and native links to popular CRMs. The platform connects to your sales engagement stack through API access. According to user reviews, integrations are easier to set up than SmartReach IO’s native CRM connectors.
メールドソ: Maildoso integrates with cold email and marketing tools like Instantly and Smartlead. The API access lets developers automate mailbox provisioning. Maildoso alternatives like Inframail and Mailforge offer similar integration breadth.
価格とコスト
料金プランを並べて比較してみましょう。
| プラン | 即座に | メールドソ |
|---|---|---|
| 入門／初心者向け | 成長：月額30ドル | 郵便受け32個：月額100ドル |
| 中級クラス | ハイパーグロース：月額77.60ドル | 郵便受け68個：月額166ドル |
| Scale / Agency | ライトスピード：月額286.30ドル | 郵便受け400個：月額733ドル |
| 企業 | カスタム | 営業担当者に問い合わせる |
即座に: The growth plan is $30/month and includes unlimited email warmup plus unlimited email accounts. The basic plan covers sending and warmup; the B2B verified leads add-on is priced separately. Compared to other tools, Instantly’s pricing is competitive and helps businesses scale outreach efforts effectively.
メールドソ: The cost effective starter plan is $100/month for 32 mailboxes. Maildoso pricing structure scales by inbox count rather than feature tier. The pricing model requires a 3-month upfront payment, which is restrictive for users on a tight budget.
さまざまなシナリオ
| 必要な場合は | 選ぶ | なぜ |
|---|---|---|
| Complete cold email tool | 即座に | Built-in campaigns and warmup |
| Bulk mailbox infrastructure | メールドソ | Up to 400 mailboxes per plan |
| Built-in lead generation | 即座に | 160M+ B2B lead database |
| Lookalike domains for cold outreach | メールドソ | Bulk domain setup and forwarding |
| Tight budget under $50 | 即座に | Growth plan at $30/month |
| Beginner friendly setup | 即座に | One platform, no extra cold email tool needed |
💰 あなたの予算
Instantly’s growth plan at $30 per month is the cost effective choice. Maildoso pricing small package at $100 plus a separate cold email tool runs $130+ per month.
🔌 あなたの技術スタック
すでに Smartleadを使用する or Lemlist, Maildoso plugs in as infrastructure. If you want everything in one place, Instantly is the standout features bundle.
📧 送信量
Maildoso’s agency pack provides 400 mailboxes for sending thousands of cold emails daily. Instantly offers unlimited email accounts to scale your outreach without per-inbox caps.
🎓 あなたの経験レベル
Instantly is user friendly for beginners doing cold emailing for the first time. Maildoso requires you to manage technical setup like DNS records and pair it with a separate cold email tool.
🆓 無料トライアルとデモ
Instantly offers a 14-day free trial with no credit card needed. Maildoso has no free trial and requires payment upfront, so test it through a partner like Smartlead first.
🛟 サポートオプション
Instantly offers 24/7 chat support and a deep knowledge base. Maildoso has been reported to have slow customer support response times for urgent issues.
切り替えガイド
既にこれらのツールのいずれかをご利用ですか？切り替える場合、どのような変更が想定されますか？
🔄 InstantlyからMaildosoに切り替えますか？
✅ 得られるもの：
- Bulk domain setup with five domains and three domains options
- Domain forwarding from lookalike domains to your main site
- More control over your cold email infrastructure
❌ 失うもの：
- Built-in unlimited email warmup (must add it as extra cost)
- Campaign builder and AI features for personalized emails
- Access to Instantly lead finder and 160M B2B lead database
📋切り替え方法：
- Export your lead lists and email campaigns from Instantly
- Buy a Maildoso starter package and a separate cold email tool
- Connect Maildoso mailboxes to your new outreach platform via API access
🔄 MaildosoからInstantlyに切り替えますか？
✅ 得られるもの：
- Unlimited email warmup included in the growth plan
- AI features for subject lines, email content, and follow ups
- Built-in B2B lead finder with verified leads from the database
❌ 失うもの：
- Bulk lookalike domains and automated DNS setup
- Three dedicated IPs option from the agency pack
- Granular control over sending domains and shared IPs
📋切り替え方法：
- Pause your Maildoso outreach campaigns and export contact lists
- Sign up for the Instantly growth plan and connect your email accounts
- Import your lead lists and rebuild outreach campaigns in the campaign builder
What Our Review Didn’t Cover
This comparison focused on solo founders and small teams running cold email campaigns. We did not test enterprise SSO, custom API access setups, or specialized industry compliance needs. Our observations are based on the March 2026 versions of both platforms. If you manage 1,000+ mailboxes or send millions of emails per month, your business needs may differ from what we covered here.
最終評決
| カテゴリ | 勝者 |
|---|---|
| 💰価格 | 即座に |
| 🚀 主な機能 | 即座に |
| 📧 メール配信率 | 即座に |
| 🎯 リードジェネレーション | 即座に |
| 🌐 Domain Management | メールドソ |
| 🤖 AI機能 | 即座に |
| 🔌 連携機能 | 即座に |
| 👶 使いやすさ | メールドソ |
| 🏆総合優勝 | 即座に |
🏆 勝者：即時
8つのカテゴリーのうち、6つで即座に勝利を収めた。
最適な用途: Cold email outreach, B2B lead generation, sales engagement workflows
Instantly and Maildoso solve different parts of cold email outreach.
Instantly is the best tool for running outreach campaigns, finding verified leads, and managing replies in one platform.
Maildoso is the cold email infrastructure provider you bolt on when you need bulk lookalike domains and more inboxes.
Maildoso is excellent for agencies managing dedicated IP setups across many client domains.
However, if you need a complete cold emailing stack with email validation and AI features, Instantly is the better choice.
Instantly Compared のその他の記事
Here is how Instantly stacks up against other cold email competitors:
Instantly vs Smartlead
即座に勝利を収めるポイント： Larger warmup pool (1.5M+ users), built-in B2B lead database, simpler campaign builder for beginners.
Smartleadが優れている点： White-label options for agencies, more flexible API access, lower entry pricing for small teams.
インスタントリー vs アポロ
即座に勝利を収めるポイント： Unlimited email warmup included, better email deliverability network, focused cold email workflow.
アポロが勝利した点： Bigger B2B lead database (275M+ contacts), built-in dialer, native CRM features.
Instantly vs Lemlist
即座に勝利を収めるポイント： Cheaper growth plan ($30 vs $59), unlimited email accounts on every tier, larger warmup network.
Lemlistが勝利した点： More complex campaign creation, video personalization, multichannel sequences with LinkedIn touches.
Instantly vs Mailshake
即座に勝利を収めるポイント： Built-in lead finder, larger deliverability pool, unlimited email warmup at no extra cost.
Mailshakeが勝利した点： LinkedIn outreach integration, phone dialer for sales engagement, simpler interface for first-time users.
インスタントリー vs ウッドペッカー
即座に勝利を収めるポイント： Lower starting price, AI-generated subject lines, included verified leads add-on access.
キツツキの勝利： Strong agency-friendly white-label options, native HubSpot and パイプドライブ sync, dedicated account managers.
Maildosoの比較をもっと見る
Here is how Maildoso stacks up against other cold email infrastructure providers:
Maildoso vs Mailforge
Maildosoが勝利した点： Established customer base of 2,000+ cold emailers, master inbox feature, native Instantly integration.
Mailforgeが勝利した点： Better deliverability and cost efficiency, faster mailbox creation, designed specifically for streamlined cold email setups.
Maildoso vs Inframail
Maildosoが勝利した点： Cheaper starter package ($100 vs higher Inframail entry), broader cold email tool integrations, simpler dashboard.
Inframailが勝利した点： Unlimited inboxes for a flat price, dedicated IP addresses included, strong deliverability reputation.
Maildoso vs Mailscale
Maildosoが勝利した点： Lower entry price for small package, established cold email marketers community, broader documentation.
Mailscaleが勝利した点： Built-in email warmup, 95-100% deliverability guarantee during initial warmup, faster account creation.
Maildoso vs Mission Inbox
Maildosoが勝利した点： Automated DNS setup for SPF, MX, and DKIM, simpler pricing structure, native API connections to cold email tools.
Mission Inbox wins on: Granular deliverability monitoring per IP and mailbox, advanced analytics for cold email campaigns, deeper sender reputation tracking.
MaildosoとGoogle Workspaceの比較
Maildosoが勝利した点： Cost savings for bulk inbox setup, built-in IP rotation, automated lookalike domain provisioning.
Google Workspaceが優れている点： Mature email providers network, stronger sender reputation by default, full productivity suite beyond email.
よくある質問
Instantly AIは何に使われていますか？
Instantly is a sales engagement platform for cold email outreach. Teams use it to automate lead generation, send personalized emails at scale, and book meetings through automated follow ups.
Maildoso とは何ですか?
Maildoso is a cold email infrastructure provider. It automates domain setup, mailbox creation, and IP rotation so cold email marketers can send outreach emails at scale.
Instantly AIには無料トライアルはありますか？
Yes, Instantly offers a 14-day free trial. No credit card is needed to test the Growth plan and try out unlimited email warmup features.
コールドメールインフラストラクチャとは何ですか？
Cold email infrastructure is the technical setup used to send high volumes of cold emails. It covers sending domains, DNS records, mailboxes, and IP addresses for high deliverability.
ApolloはInstantlyよりも優れていますか？
Apollo offers a larger B2B lead database and built-in dialer. Instantly wins on email deliverability with its 1.5M+ warmup pool and unlimited email accounts on every plan.
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