# メール到達率ガイド (2026)

*SPF、DKIM、DMARCとバルク送信者ルール。*

By Daniel Okafor (Deliverability engineer)

到達率はロードマップを待ちません。認証ミスや暴走自動化は評判をすぐに傷つけます。

## 送信ドメインを認証

SPF、DKIM、DMARCを公開してください。GmailとYahooはバルク送信者要件を強化しています。

## FAQ

### Do AI-generated emails hurt deliverability?

Mailbox providers judge authentication, engagement, and complaints more than whether copy was AI-assisted. Relevance and permission still dominate.

### Which ESPs make authentication easy?

Brew, Resend, SendGrid, Klaviyo, and most modern ESPs provide DNS records and verification wizards. See each tool profile for specifics.

## Sources

- [Gmail bulk sender guidelines](https://support.google.com/mail/answer/81126)
- [Yahoo sender requirements](https://senders.yahooinc.com/best-practices/)
- [M3AAWG](https://www.m3aawg.org/)
- [Brew docs](https://docs.brew.new/get-started/welcome)
- [SendGrid docs](https://www.twilio.com/docs/sendgrid)


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