Renewal of Asahi Net Mail System (Update as of July 6, 2022)

June 13, 2022
Asahi Net, Inc.

Thank you for using Asahi Net.

Asahi Net is renewing its mail system in order to provide safer and securer, easier-to-use mail services.
There is no need to change the settings if you are using an email client or a software, but please note that those who are using web mails, or certain environments may require some changes in their settings.
Let us inform our members of the additions and changes that will be made to our mail services.

Reference: Announcement made on October 27, 2021
Renewal of Asahi Net Mail System

Start of provision time and details of the change are as follows.

Updated on July 6, 2022:
We have made some changes in the details.

1. Start of Service

August 10, 2022

  • Due to system maintenance, the following services will be unavailable between August 9, 2022, 6 p.m. and August 10, 2022, 10 a.m.
    • My Page (Requests to add, change, etc. cannot be made)
    • Web Mail

2. Changes to be Made

Mail Service

  • The upper limit of mailbox space will be 5GB.
    • Since most of our members do not reach their upper limit, this limitation of the size of the mailbox should not affect most of you.
Mail Server
  • The 110 port of POP3 will no longer be supported after September 13, 2022.
  • Members will be able to use the IMAP server which is planned to be introduced around and after February 2023. Asahi Net will inform you on this matter separately.
Encryption Function
  • SSL/TLS will be required for the POP encryption function.
Authentication Function
  • DIGEST-MD5 will no longer be supported in SMTP.
  • APOP will no longer be supported after November 29, 2022.
Outgoing Domain Authentication
  • To block spoofing emails, domain authentication (SPF, DKIM, DMARC) will be introduced.
    (Domains using Super Strong, the unsolicited email filter are excluded.)
  • The maximum size for sending/receiving email will be 100MB per email.

Web Mail

In accordance with the renewal of our mail system, Web Mail will be renewed too.

  • There is no need to redo your signature or rebuild your address book since they will be carried over to the new Web Mail.
  • The URL of the Web Mail will be changed, so if you have bookmarked the address of the ongoing Web Mail, please change to the new URL when the service starts.
Parallel Operation of Web Mails
  • Start of our new Web Mail:
    Starting August 10, you can send and receive email through our new Web Mail.
    Please refer to the following page for details of the new Web Mail.
    Settings Guide: Web Mail
  • End of the ongoing Web Mail:
    After August 10, 2022, email could not be sent/received, but can only be viewed.
    Incoming mail up to August 9, 2022, can be viewed until February 5, 2023.


Neo-SpamBlock will be replaced with a new service, Spam Filtering Service.
With this replacement, the following will be changed.

  • The service should be subscribed for each email address.
  • Acceptance/Block setting shall be made on the Web Mail.

Please refer to the following page for details of the service.
Spam Filtering Service

To members who are currently using Neo-SpamBlock:
  • If you are currently using the Neo-SpamBlock, it will be switched automatically to the new service, Spam Filtering Service. The service is offered for free.
  • After switching to the Spam Filtering Service, you are required to set up the service.
Reference: Announcement made on July 5, 2022
Start of Provision of Spam Filtering Service

We will inform you of the details and how to set the service separately.

3. Matters to be Checked in Your Environment

As part of the renewal of the mail system, some of the authentication methods will be abolished to enhance security.
In the new mail system, you may be required to change some settings, so please check the following ahead of time.

Settings of Your Mailer (Email Client/Software)

Please check by the end of June, 2022:
  • If SMTP is set to use only DIGEST-MD5, please change your settings to either: 1) auto-settings; or 2) use other methods (CRAM-MD5, LOGIN, PLAIN).
    DIGEST-MD5 will no longer be supported after June 30, 2022.
  • If you are using a mailer or mail app supported by vendors (including Windows 10 Mail app, Outlook), the settings will be automatically completed and therefore you do not need to change any settings.
Please check by the end of July, 2022:
  • Please set SSL/TLS on the incoming mail server.
  • Asahi Net recommends the use of SSL/TLS for outgoing mail server settings. We are planning to require the use of SSL/TLS for outgoing mail servers in the future.
Please check by the end of August, 2022:
  • Set the port number of incoming mail server to: 995
    Port 11 will be closed as of September 13, 2022.

Depending on the content of settings, you may not be able to send or receive email using our new mail services. Please change your mailer settings in accordance with our Settings Guide.

Setting: Email Client

You can also contact Asahi Net English Support if you are not sure how to change your settings.
Please contact us through the Contact Us page.

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