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Important: Please update your email settings due to the end of support for select authentication methods (Updated on October 22, 2026)

Asahi Net, Inc.
Updated on September 28, 2026
Updated on October 13, 2026
Updated on October 22, 2026

For members who are unable to send or receive email even after updating the settings:

If you are still unable to send or receive messages after changing the settings by following the Setup Guide, please try restarting the app or your device.

Thank you for using Asahi Net.

To enhance the security of Asahi Net’s email services, we will update and strengthen our security system on October 20, 2026.

Following this update, some members will be required to change their mailer (or app) settings.

If you are unable to send and receive emails after October 20, you can continue to use the service by updating your mailer or app settings.

Please read the following instructions and check if you need to update your settings.

  • *Asahi Net will also contact the affected members separately by email.

We apologize for the inconvenience this may cause and appreciate your understanding and cooperation.

1. End-of-support authentication methods

  • Sending email with CRAM-MD5 (MD5-Challenge authentication)
  • Receiving email with APOP
    • *The support ends for APOP and not POP. POP will continue to be available.

2. End-of-support date

October 20, 2026

3. Please check if you need to update your settings

The need for an update depends on the mailer or app you are using.

Mailers and apps that do not require any setting updates

If you are using any of the following mailers or apps, no update is required.

  • Microsoft Outlook (for Windows, for Mac)
  • Gmail app (for smartphones)
  • Web Mail (via web browser)

Mailers and apps that require setting updates

If you are using any of the following mailers or apps, please check your settings and update them accordingly.

  • Thunderbird
  • Standard iPhone/iPad Mail App (iOS)
  • Standard Mac Mail App (macOS)

4. How to check and update your settings

Please check your mailer settings

In your mailer’s settings, if the password authentication method is set to “暗号化されたパスワード (= Encrypted password)”, “CRAM-MD5 (MD5 Challenge-Response)”, or “APOP”, you need to change it to “通常のパスワード (= Normal password)” or “Password”.

Please refer to the setup guide of your mailer and update your settings accordingly.

Mailer Setup Guide What needs to be updated
Thunderbird (POP) Confirm settings
  • Go to STEP 4. Change the Authentication to 通常のパスワード認証 (= Normal password).
  • Go to STEP 6. Change the Authentication to 通常のパスワード認証 (= Normal password).
Thunderbird (IMAP) Confirm settings
  • Go to STEP 4. Change the Authentication to 通常のパスワード認証 (= Normal password).
  • Go to STEP 6. Change the Authentication to 通常のパスワード認証 (= Normal password).
Standard Mail App (POP) Confirm settings Go to STEP 4. Change the Authentication for Incoming Mail Server (POP) and Outgoing Mail Server (SMTP) to パスワード (= Password).
  • *If the Authentication field is grayed out or not editable, please remove the check mark of 接続設定を自動的に管理 (= "Automatically manage connection settings).
iPhone/iPad Mail App Confirm settings
  • Go to STEP 5. Change the Authentication for OUTGOING MAIL SERVER to パスワード (= Password).
    • *If the field is blank, no update is needed.
  • Go to STEP 6. Change the Authentication for アカウント (= Accounts) > 詳細 (= Advanced) to パスワード (= Password).
If you are using a mailer not listed here:

Please refer to the following page for other setup guides.

Reference: FAQ

Mail Service: How do I check my mailer settings?

Important request regarding your settings:

To protect customer information, Asahi Net strongly recommends using TLS 1.2 or later for sending and receiving messages. (We do not support sending or receiving messages using TLS 1.0/1.1.)

Please check for unsupported versions of your OS and mailer

You may not be able to send or receive emails if you are using an unsupported OS or mailer that is incompatible with the latest security standards (such as TLS 1.2 or later). To use Asahi Net’s email services safely, please keep your mailer up to date.

  • *Asahi Net cannot give guidance on how to set up an OS or a mailer that is no longer supported. Thank you for your understanding and cooperation.
Reference: Unsupported OS and mailers
  • Windows XP and older, Windows 7, Windows 8
  • Outlook 2010 and older, Outlook Express
  • All versions of Windows Live Mail
  • Mac Mail 10.11 and older

If you wish to check or send your email as soon as possible, please use Asahi Net’s Web Mail, which allows you to access your email directly in a web browser.
You can log in and use the service with the ID and password of your mailer.

Setup Guide: Web Mail

  • *For specification and security reasons, please update your web browser to the latest version.

5. If you still cannot send or receive email after updating your settings

If you are unable to send or receive email even after updating your settings, please try restarting the app or your device.

6. Inquiries regarding this announcement

We expect to receive many inquiries near the end-of-support date. As a result, it may take us longer than usual to respond. We apologize for any inconvenience it may cause you, and we appreciate your understanding.

Online Technical Support Inquiries

Thank you for using Asahi Net and we look forward to continuing to serve you.

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