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So-net Mail

Freemium#88 of 115 in Personal Email Services

So-net Mail: A practical So-net mailbox with IMAP, custom domains, and multi-device access. Ranked #88 of 115 in Personal Email Services by our editors (6.0/10); pricing: Free plan; best for users needing custom domains and multi-device IMAP.

6.0/10Editor score

Visit So-net Mail

So-net Mail6.0 Visit So-net Mail

At a glance

Editor score
6.0 / 10
Pricing
Free plan
Best for
Users needing custom domains and multi-device IMAP
Free plan
Yes
Mailbox storage
3 GB
Facts checked
22 Sep 2026

Where it wins
- IMAP access across web, desktop, and mobile devices
- Custom-domain addresses, forwarding, aliases, and allowlists
- Spam filtering and virus checking are available
Where it doesn't
- The free mailbox is limited to So-net connection-course customers
- IMAP access is an additional ¥88/month service
- Basic Mailbox messages are retained for two months

Our verdict on So-net Mail

So-net Mail is a personal email service for So-net connection subscribers. Its free Basic Mailbox provides a so-net.ne.jp address, webmail access, unlimited mailbox capacity, unlimited stored messages, and two-month message retention. Users can access mail on the web, Windows, macOS, iOS, and Android, while the service also supports forwarding, additional addresses, spam filtering, virus checking, blocking, and allowlists. Custom-domain email addresses are available as an optional service, making it relevant to individuals who want more control over their address setup.

The clearest upgrade is the IMAP Service, priced at ¥88/month. It adds IMAP access for desktop and mobile email clients, 3 GB of mailbox capacity, unlimited stored messages, and longer retention: two years for inbox, sent mail, and drafts, with indefinite retention for user-created folders. The published service details also identify Gmail and Outlook.com as integrations. Users who need a conventional multi-device setup should focus on this tier rather than the Basic Mailbox, since webmail access alone does not provide the same client flexibility.

So-net Mail fits solo users and small setups already connected to So-net services, especially those prioritizing custom domains, aliases, forwarding, and device flexibility. Its main trade-off is that the most useful multi-device feature is paid, while the free option is tied to eligible So-net connection customers and keeps messages for only two months. Buyers seeking a simple included mailbox may find Basic Mailbox sufficient; those needing IMAP should budget for the add-on and its 3 GB capacity.

Your product? Our editors can test So-net Mail in depth and publish a review, labelled as paid · from $149/mo →

So-net Mail pricing

Plans Free planFreemium A usable free plan; paid tiers unlock the limits above. Prices checked 22 Sep 2026.

See plans on so-net.ne.jp

All 2 So-net Mail plans and prices →

So-net Mail fact sheet

Free plan	Yes
Paid from	Not verified
Mailbox storage	3 GB
Attachment limit	Not verified
Custom domain	Yes
Email aliases	Yes
Ad-free inbox	Not verified
Platform access	Web_mobile_desktop
Deployment	Cloud, Desktop, Mobile
Platforms	Web, Windows, macOS, iOS, Android
Support	Docs
Built for	Solo, Small business (editorial estimate)
Integrations	2 integrations: Gmail, Outlook.com
Pricing	Free plan (source)
Website	so-net.ne.jp
Facts checked	22 Sep 2026

So-net Mail integrations

So-net Mail lists 2 integrations on its own site.

Gmail
Outlook.com

Alternatives to So-net Mail

See all So-net Mail alternatives →

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The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used So-net Mail for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.

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Featured on iTechGuides

So-net Mail is listed in our Personal Email Services directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update