Gmail・Outlook.com・Proton Mail・Zoho Mail・Fastmail・iCloud Mail 比較
Email providers side by side: free storage, your own domain, cheapest paid plan, encryption, ads and IMAP
更新
なぜこれらを比べるか
Six mailboxes people choose between, for personal mail or an address on their own domain. A feature table, not a ranking. Cheapest ways to your own domain: Zoho Mail (free for one domain, or $1 a user) and iCloud+ ($0.99 a month). Proton Mail is the only one with end-to-end encryption on every plan, free included. Gmail and Outlook.com say on their own pages that the free inbox shows ads. Microsoft stopped new own-domain addresses on personal Microsoft 365 plans in 2023.
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1
G
Gmail
Google's email service: free personal Gmail with 15 GB of Google Account storage, and paid Google Workspace plans for custom-domain email.
Free Google mailbox; own domain via Workspace
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2
O
Outlook.com
Microsoft's consumer email service: free Outlook.com with 15 GB of mail storage, upgraded to an ad-free 100 GB mailbox with a Microsoft 365 consumer subscription.
Free Microsoft mailbox; ad-free with Microsoft 365
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3
P
Proton Mail
Swiss privacy-focused email with end-to-end and zero-access encryption, an ad-free free plan and paid plans that add custom domains and IMAP via Bridge.
End-to-end encrypted email with a free plan
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4
Z
Zoho Mail
Business email from Zoho with a Forever Free plan for one domain (up to 5 users) and paid Mail Lite plans billed annually.
Low-cost business email, free plan for one domain
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5
F
Fastmail
Independent paid email service with no ads or tracking, custom domains on Individual and higher plans, and a 30-day free trial instead of a free plan.
Paid, ad-free email with a 30-day trial
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6
i
iCloud Mail
Apple's email service included with an Apple Account (5 GB free iCloud storage), with Custom Email Domain on every iCloud+ plan.
Apple's email; own domain with iCloud+
並べて比較
| Gmail | Outlook.com | Proton Mail | Zoho Mail | Fastmail | iCloud Mail | |
|---|---|---|---|---|---|---|
| Free plan | ||||||
| Free plan | Yes (personal Gmail) | Yes (Outlook.com) | Yes (Proton Free) | Yes (Forever Free, available only in select data centers) | No (30-day free trial) | Yes (with an Apple Account) |
| Free plan: storage | 15 GB per Google Account ("All Google accounts come with up to 15 GB of storage") | 15 GB email storage (separate from 5 GB Microsoft cloud storage) | Up to 1 GB (500 MB at start, raised to 1 GB by completing a checklist) | 5 GB mail storage per user | No free plan | 5 GB iCloud storage, shared |
| Free plan: own domain | Not listed (custom business email is listed only under paid Google Workspace plans) | No | No (custom domains need a paid plan) | Yes, email hosting for one domain for up to 5 users | No free plan | No (Custom Email Domain is an iCloud+ feature) |
| Paid plans | ||||||
| Cheapest paid plan | Google Workspace Business Starter: $7 per user/month with 1-year commitment, billed monthly, excl. tax (promo $3.50 Nov 4, 2026 - Feb 4, 2027) | Microsoft 365 Basic: $1.99/month, or $19.99/year | Mail Plus: $3.99/month billed $47.88 every 12 months, or $4.99 month-to-month | Mail Lite 5 GB: $1 per user/month, billed annually (no monthly plan) | Basic: $3 per user/month billed yearly ($36), or $4 month-to-month; Individual from $5/month billed yearly | iCloud+ with 50 GB: $0.99/month (US) |
| Paid plan: storage | 30 GB pooled storage per user | 100 GB mailbox (subscriber benefit) plus 100 GB cloud storage | 15 GB | 5 GB mail storage per user (10 GB option at $1.25 per user/month) | 6 GB per user on Basic (60 GB on Individual) | 50 GB iCloud storage, shared |
| Own domain on paid plan | Yes ("Secure custom business email you@your-company.com") | No for new users: new personalized addresses closed to Microsoft 365 Personal/Family since Nov 30, 2023; Microsoft points to Business plans | Yes, 1 custom domain on Mail Plus (all paid plans support custom domains) | Yes ("Enterprise-grade custom email") | Not on Basic; yes on Individual, Duo, Family, Standard and Professional | Yes, Custom Email Domain on every iCloud+ plan |
| Privacy | ||||||
| End-to-end encryption | Not on personal Gmail or Business Starter; Gmail client-side encryption only on Enterprise Plus, Education Standard/Plus and Frontline Plus | Not listed as end-to-end; Microsoft 365 subscribers get message encryption and prevent-forwarding in Outlook.com | Yes, end-to-end and zero-access encryption on all plans | PGP encryption listed as an end-to-end feature, plus S/MIME; per-plan availability not listed | No in Fastmail's own apps; PGP or S/MIME possible via third-party apps | No, even with Advanced Data Protection (optional S/MIME in Apple mail apps) |
| Ads in the free inbox | Yes (help page: "When you open Gmail, you'll see ads") | Yes ("An ad-free inbox" is listed as a Microsoft 365 upgrade benefit) | No ("Ad free, always free") | No ("We will never serve you ads, nor sell your data") | No free inbox; all plans "no ads, ever" | Not listed |
| Apps | ||||||
| IMAP / third-party apps | Yes, IMAP is always on for personal Gmail accounts | Yes, POP and IMAP (off by default; turn on in settings; OAuth2 required) | Paid plans only, via Proton Mail Bridge (IMAP/SMTP) | Paid plans only; IMAP/POP/ActiveSync not included in Forever Free | Yes on Individual and higher; Basic plans do not include IMAP, SMTP, CalDAV or CardDAV | Yes, IMAP and SMTP (no POP) |
測り方
Read from each provider's own pricing pages and help docs on the date in the references, with US prices (pages that detect location were read from a US address). Prices in US dollars, before tax; promotions shown next to the regular price.
参考資料
- Curated: email providers (official pricing pages and help docs), shortlist20 research (facts from official pages). Checked 2026-10-21 09:02 UTC.
- Google Workspace pricing, Google, checked 2026-10-21.
- Google One plans, Google, checked 2026-10-21.
- Gmail Help: Add Gmail to another email client (IMAP), Google, checked 2026-10-21.
- Gmail Help: Ads in Gmail, Google, checked 2026-10-21.
- Google Workspace Admin Help: S/MIME for Gmail client-side encryption, Google, checked 2026-10-21.
- Microsoft 365 Basic, Microsoft, checked 2026-10-21.
- Storage limits in Outlook.com, Microsoft, checked 2026-10-21.
- Subscription features in Outlook.com for Microsoft 365 subscribers, Microsoft, checked 2026-10-21.
- Get a personalized email address in Microsoft 365, Microsoft, checked 2026-10-21.
- POP, IMAP, and SMTP settings for Outlook.com, Microsoft, checked 2026-10-21.
- Proton Mail pricing, Proton, checked 2026-10-21.
- Proton Mail, Proton, checked 2026-10-21.
- Proton Support: custom domain, Proton, checked 2026-10-21.
- Zoho Mail pricing, Zoho, checked 2026-10-21.
- Zoho Mail Help: IMAP access, Zoho, checked 2026-10-21.
- Fastmail pricing, Fastmail, checked 2026-10-21.
- Fastmail security, Fastmail, checked 2026-10-21.
- Fastmail Help: Server names and ports, Fastmail, checked 2026-10-21.
- iCloud+ plans and pricing, Apple, checked 2026-10-21.
- iCloud data security overview, Apple, checked 2026-10-21.
- iCloud Mail server settings, Apple, checked 2026-10-21.
