: Reserved for higher education institutions like universities.
In conclusion, having a comprehensive list of current email addresses of companies in Japan is crucial for businesses, marketers, and entrepreneurs looking to expand their reach in the Japanese market. By using the email addresses listed in this article, and by following the tips on how to use them effectively, you can connect with potential customers, partners, and suppliers in Japan and take your business to the next level.
Held approximately 55% of the market share in Japan. It is the go-to for many Japanese startups and small businesses due to its integration with other productivity tools.
Legal Compliance: Compliance with Japan's Act on Regulation of Transmission of Specified Electronic Mail Held approximately 55% of the market share in Japan
site:.jp "yahoo.co.jp" 東京 "サロン" "Eメール"
Japan’s anti-spam law dictates that you cannot send commercial advertising emails to individuals unless they have explicitly opted in.
: Largely considered outdated. Using an AOL address is sometimes viewed as a sign of being a "technical dinosaur" in a professional context. : Largely considered outdated
: Provides registries of member businesses across various industry sectors.
Now that you have a list of current email addresses of companies in Japan, here are some tips on how to use them effectively:
Business matchmaking in Japan has transitioned heavily to managed professional networks. using free public email domains like
For businesses in Japan as of early 2026, using free public email domains like , hotmail.com , or yahoo.com is generally discouraged for formal corporate use, as it can negatively impact professional credibility . Established Japanese companies almost exclusively use custom domains, particularly .co.jp , which is reserved for registered corporations and is the most trusted extension in the country. Review of Email Domains in Japan
The Act on Regulation of Transmission of Specified Electronic Mail strictly regulates B2B and B2C email marketing: