So-net Mail

Plans and prices

Every plan, in full

On the record

Email aliases

Yesso-net.ne.jp · read 22 Sep 2026

Audience

The webmail service is for So-net email account holders and is accessible through a browser on supported devices.so-net.ne.jp · read 11 Oct 2026

Custom domain

Yesso-net.ne.jp · read 22 Sep 2026

Email account compatibility

So-net Webメール supports So-net-issued accounts including basic mail, PostPet, A-box, and So-net VAIO mail.so-net.ne.jp · read 11 Oct 2026

IMAP constraints

IMAP mailboxes have a 3GB capacity limit, and server-side message search is not provided.so-net.ne.jp · read 11 Oct 2026

IMAP use

The IMAP service allows users to access the same mailbox state from multiple computers and smartphones.so-net.ne.jp · read 11 Oct 2026

Mailbox storage

3so-net.ne.jp · read 22 Sep 2026

New account limit

So-net states that it will stop issuing basic email addresses to new connection-service registrants from November 4, 2026; existing customers can continue using theirs.so-net.ne.jp · read 11 Oct 2026

No setup

Users can log in with their So-net email address and password without installing or configuring mail software on each device.so-net.ne.jp · read 11 Oct 2026

Platform access

web_mobile_desktopso-net.ne.jp · read 22 Sep 2026

Purpose

So-net Webメール lets users send and receive email on the web.so-net.ne.jp · read 11 Oct 2026

Retention limit

Webmail messages are retained for two months; spam and trash folder messages are automatically deleted after 14 days.so-net.ne.jp · read 11 Oct 2026

Security transport

So-net announced the end of support for TLS 1.0 and 1.1 for its email service.so-net.ne.jp · read 11 Oct 2026

Spam control

The free spam filtering service offers four spam sensitivity levels and configurable sender, recipient, and subject conditions.so-net.ne.jp · read 11 Oct 2026

Support

So-net Webmail help is available through the question mark icon in the webmail interface, with an FAQ linked from the service page.so-net.ne.jp · read 11 Oct 2026

Supported devices

The service supports PCs, smartphones, and tablets, but not feature phones.so-net.ne.jp · read 11 Oct 2026

Webmail features

The webmail service supports spam and folder filtering; spam filtering requires a separate free application.so-net.ne.jp · read 11 Oct 2026

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