How to Send SMS to Japan (Rules & Deliverability)

Sending to Japan? Local rules decide whether your messages arrive.

The rules in Japan

Japan's Act on Regulation of Transmission of Specified Electronic Mail requires opt-in consent and sender identification.

How to stay compliant and deliverable

• Get explicit consent and honor opt-out.
• Register sender IDs and templates where required.
• Use approved A2P routes, not grey routes.

How Rainmail helps

Rainmail sends from your own domain on a dedicated, isolated IP with SPF, DKIM, DMARC, reverse-DNS and managed warm-up handled for you, plus an AI that watches your list health and deliverability — and it welcomes the senders Amazon SES, SendGrid and Mailchimp reject, from $8. Run the free 10-second checker or see plans.