Sending Cold Email Without Breaking Japan's Anti-Spam Act (2026)
Is B2B cold email illegal? A practical look at the opt-in exemption for businesses under Japan's Act on Specified Electronic Mail, required unsubscribe paths, and mandatory sender disclosures. Penalties (up to ¥30M for companies), how to stay clear of them, and a safe sending pace.
"Does B2B cold email violate Japan's Act on Specified Electronic Mail?" The short answer: with a proper unsubscribe path and sender disclosure, it doesn't. There are only three points that matter.
Bottom line: businesses fall under the opt-in exemption, but three obligations apply
- 01State the sender (company name, address, contact) in the bodyAlways include company info at the foot of the body. A sole proprietor may instead use "disclosed on request".
- 02State how to unsubscribe (opt out), and act within 3 business daysA URL or an email reply. You must have a workflow that responds the moment a request comes in.
- 03Opt-in is required for individuals; there's an exemption for businessesFor B2B — a corporate recipient — prior consent is not required for an email address published on an official site, etc. (Article 3, Paragraph 1, Item 3).
1. Information required in the sender disclosure
- The sender's name or company name
- An address (a sole proprietor may instead use "disclosed on request")
- A point of contact (email or phone)
- How to unsubscribe (URL or reply)
2. The unsubscribe (opt-out) obligation
At the foot of the email body, clearly state "Unsubscribe here → URL" or "To unsubscribe, reply to this email". When a request comes in, you must, as a rule, complete the unsubscribe within 3 business days.
3. The B2B (business) exemption
The Act on Specified Electronic Mail is fundamentally a law protecting individuals, but Article 3, Paragraph 1, Item 3 specifies that prior consent is not required to send to "a corporation that has published its own email address". In other words, you may send to an email address listed on an official website as long as you satisfy obligations 1 and 2 above.
| Recipient | Opt-in required? | Conditions |
|---|---|---|
| Individual (gmail.com, etc.) | Required | May not send without prior consent |
| Business (email listed on an official site) | Not required | Sender disclosure + unsubscribe path required |
| Business (email received on a business card) | Not required | B2B exemption, but unsubscribe path still required |
| Sole proprietor (with a trade name) | Judgment varies | Treated as a business if commercial intent is clear |
A practical checklist
- Confirm the recipient is a business (or a sole proprietor's business address)
- Confirm the email address was obtained from public information (an official site, etc.)
- Confirm the sender disclosure and unsubscribe path are at the foot of the body
- Have a workflow ready to respond to replies within 3 business days
- Keep a separate "never send again" list for any address that requested an opt-out
How bacotto stays compliant
bacotto captures email addresses only from official sites and public information, which falls under sending to "a corporation that has published its own email address". The AI sales-copy generator automatically includes an unsubscribe path.
Penalties for a violation
- Failing to disclose sender info or ignoring unsubscribes → an administrative order → a fine of up to ¥1M (up to ¥30M for a company)
- An ISP / sending provider cuts you off → your sending domain's reputation collapses
- Blacklisting → it affects even your legitimate outreach afterward
Sending pace (a technical best practice)
To preserve your Gmail / Outlook reputation, avoid blasting from a new domain. A warm-up period (gradually ramping up volume) of 2-4 weeks is recommended.
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