# SPF Record Builder

Source: https://wraps.dev/tools/spf-builder

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Free Tool

Build valid SPF records while tracking the 10-lookup limit. Select your email providers and we'll generate the correct syntax.

What counts as a lookup?

`include:`, `a`, `mx`, `ptr`, and `exists` mechanisms all require DNS lookups. `ip4:` and `ip6:` do not.

Why the 10-lookup limit?

RFC 7208 limits SPF to 10 DNS lookups to prevent denial of service attacks. Exceeding this causes a PermError, which fails DMARC alignment.

What is SPF flattening?

SPF flattening resolves includes to their IP addresses, eliminating lookups. But IPs can change, requiring regular updates or a service like Valimail.

### Check your full email setup

Use our Email Deliverability Checker to verify SPF, DKIM, DMARC, and more.

[Check Your Domain](https://wraps.dev/tools)

### Calculate your AWS SES costs

See exactly what you'll pay for email sending plus the full infrastructure — EventBridge, Lambda, SQS, and DynamoDB.

[Open Calculator](https://wraps.dev/tools/ses-calculator)

Want to learn more about SPF and the 10-lookup problem?

[Read: The SPF 10-Lookup Limit Explained](https://wraps.dev/blog/spf-guide)