Setup Guide: Mailer Settings

Recommended settings per mailer

This section gives information on Asahi Net’s recommended mailer settings to enhance security, and how to actually send/receive email.

Before you make settings, please confirm the following.

  • Asahi Net’s mailer setting information is only suitable for email address provided by Asahi Net.
    Please do not use email address provided by any other companies in Asahi Net’s mailer settings, nor use Asahi Net’s email address in settings for other companies.
  • To send and receive email, please use the encryption function of POP over SSL/TLS and SMTP over SSL/TLS, and SMTP authentication.

Please keep your mailer always up to date in order to use our email service safely. Use of OS and mailer which are no longer supported by the manufacturer is extremely risky for security reasons.
Asahi Net cannot give guidance on how to set up an OS or a mailer which is no longer supported.

Email Client Settings

See the following page for more details on how to set up Asahi Net’s email services.

See the following for details of the respective mailer on how to set up.


Windows 10 Mail App
Microsoft Outlook (365/2019 or Later)
Outlook 2016 (version 1810 or later)
Outlook 2016
Thunderbird (Version 91 or later)
Outlook 2013

Support has ended. Please use another mailer.

  • *Microsoft Outlook (365/2019 or later) is recommended.
Windows Live Mail

Support has ended. Please use another mailer.

  • *Thunderbird (a free mailer) is recommended.
  • The new Outlook for Windows provided by Microsoft after September 2023 is not supported.
    To set up, please switch back to the old Outlook or the standard Windows Mail app. Please contact the manufacturer of your computer for details.

Mac OS (Macintosh)

Standard Mail App (macOS Ventura or later)
Mail 10.3 for macOS Sierra Version 10.12
Standard Mail App (Mac OS X 10.11 or older) Support has ended. Please update it to the latest version.


Asahi Net cannot give guidance on how to set up mailers which are no longer supported.
If you have questions, or for more details, please contact the developer, manufacture, etc.

iPhone / iPad(iOS 14)
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