S
SPF
Define which services are authorized to send email using your domain.
- Authorization
- DNS record limits
- Common configuration mistakes
Email Authentication
SPF, DKIM, and DMARC made clearer.
Understand the records that protect your sending domain and use practical tools to configure them.
D
DKIM
Add a cryptographic signature that recipients can verify against your DNS record.
- Selectors
- Key length
- Alignment
M
DMARC
Tell receiving providers how to handle authentication failures and where to send reports.
- None, quarantine, or reject
- Aggregate reporting
- SPF and DKIM alignment
Free Tool
DMARC Generator
Answer a few questions and create a basic DMARC record you can copy into DNS.
This generator creates a starting record. Review it for your environment before publishing enforcement policies.
v=DMARC1; p=none; rua=mailto:dmarc@example.com; pct=100
Roadmap
More free authentication tools.
The website structure is ready for these tools as they are developed.
SPF Generator
Build an SPF record from approved sending services.
SPF Lookup
Inspect an existing SPF record and identify common issues.
DKIM Lookup
Check a selector and confirm the public key is available.
MX & DNS Lookup
Review mail routing and supporting DNS records.