# E-Mail-Zustellbarkeit (2026)

*SPF, DKIM, DMARC und Bulk-Regeln.*

By Marcus Okonkwo (Deliverability specialist)

Zustellbarkeit ist die harte Grenze. Fehlende Authentifizierung schadet schneller als schlechter Copy.

## Jede Domain authentifizieren

SPF, DKIM und DMARC veröffentlichen. Gmail und Yahoo verschärfen Bulk-Anforderungen.

## 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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