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Yahoo! JAPAN Mail
What Yahoo! JAPAN Mail is
Yahoo! JAPAN Mail is a personal email service that creates an address through a Yahoo! JAPAN ID. It works on the web and official Android and iPhone/iPad apps. Core tools include composing, searching, folders, and automatic sorting. Reservation emails can be added to a calendar automatically, and reminders can prompt you about a notification or message later. The mobile app can manage Gmail, Docomo, au, and SoftBank accounts; Android supports Gmail, while SoftBank access is limited to i.softbank.jp. Security measures include spam filtering, overseas-access restrictions, SPF, DKIM, DMARC, and sender-identifying icons. Free secondary safety addresses share the main inbox, with up to 10 normally or 30 for Yahoo! BB or Security Pack users. Mailboxes start at 2GB and can grow to 10GB without qualifying services. Each email is limited to 25MB, and unused mailboxes may be suspended after six months.
Who it suits
It suits people wanting a free Yahoo! JAPAN address with web and mobile access, sorting, reminders, and calendar handling. Users needing larger storage or multiple safety addresses may consider the qualifying Yahoo! services.
What it does well
- Free web and mobile access
- Spam filtering and sender authentication
- Automatic calendar handling for reservation mail
- Secondary addresses share the main inbox
- Mailbox can grow to 10GB
What to know first
- Each email is limited to 25MB
- Unused mailboxes may be suspended after six months
- Custom domains are not supported
- Android account management supports Gmail only
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free | Yahoo! JAPAN ID registration and access · 10 GB mailbox storage · Web and mobile app access | Free |
| Virus Check Service | Server-side virus detection and removal · Advertising is removed from the Yahoo! Mail interface · Automatically renews monthly | On request |
| Yahoo!メール（無料） | Mailbox starts at 2GB and can grow to 10GB · 25MB maximum per email · mailbox may be suspended after 6 months without use | Free |
As mail.yahoo.co.jp lists them, read 19 Sept 2026. The maker's own page has the final word.
Verdict
Yahoo! JAPAN Mail provides a broad free email feature set with mobile apps and several security controls. Check the message-size, inactivity, and platform-specific account limits before relying on it.
Facts from Yahoo! JAPAN Mail's own pages
- Ad-free inbox
- Yes · mail.yahoo.co.jp, 19 Sept 2026
- Email aliases
- Yes · mail.yahoo.co.jp, 19 Sept 2026
- Calendar integration
- Received reservation emails can be automatically added to the calendar. · mail.yahoo.co.jp, 11 Oct 2026
- Custom domain
- No · mail.yahoo.co.jp, 19 Sept 2026
- Email service
- Yahoo!メール lets users create a personal email address with a Yahoo! JAPAN ID. · mail.yahoo.co.jp, 11 Oct 2026
- Follow-up reminders
- The app can send a reminder at a chosen time for a notification or an email to read later. · mail.yahoo.co.jp, 11 Oct 2026
- Free plan
- Yes · mail.yahoo.co.jp, 19 Sept 2026
- Headquarters
- Tokyo, Japan · mail.yahoo.co.jp, 28 Sept 2026
- Inactivity limit
- Email addresses and mailboxes unused for at least six months may be suspended. · support.yahoo-net.jp, 11 Oct 2026
- Mailbox capacity
- A mailbox starts with a 2GB limit and grows over time to at most 10GB without qualifying services; Yahoo! BB, Security Pack, or eligible LYP Premium accounts can grow without a stated limit. · support.yahoo-net.jp, 11 Oct 2026
- Mailbox features
- The service supports composing and searching email, folders, and automatic sorting. · mail.yahoo.co.jp, 11 Oct 2026
- Mailbox storage
- 10 · mail.yahoo.co.jp, 19 Sept 2026
- Message limit
- Each email, including its body and attachments, is limited to 25MB. · support.yahoo-net.jp, 11 Oct 2026
- Mobile apps
- Official Yahoo!メール apps are available for iPhone/iPad and Android, and use requires a Yahoo! JAPAN ID login. · apps.apple.com, 11 Oct 2026
- Multiple accounts
- The mobile app can manage Gmail, Docomo, au, and SoftBank email accounts; Android supports Gmail only, and SoftBank support is limited to i.softbank.jp. · mail.yahoo.co.jp, 11 Oct 2026
- Platform access
- web_mobile_desktop · mail.yahoo.co.jp, 19 Sept 2026
- Safety addresses
- Users can create free secondary addresses that share the main inbox, with up to 10 normally or 30 for Yahoo! BB or Security Pack users. · mail.yahoo.co.jp, 11 Oct 2026
- Security features
- The service lists spam filtering, restrictions on overseas access, and brand icons among its security measures. · mail.yahoo.co.jp, 11 Oct 2026
- Sender authentication
- Yahoo!メール uses SPF, DKIM, and DMARC and displays icons to help users assess sender authenticity. · support.yahoo-net.jp, 11 Oct 2026
- Support
- Yahoo!メール help offers searchable articles, an AI chat agent, and contact forms that require login for personalized assistance. · support.yahoo-net.jp, 11 Oct 2026
Where Yahoo! JAPAN Mail stands on Freedom251
- Personal Email Services#45 of 115