Email Security Tools

SPF Record
Generator & Validator

Generate a flawless TXT record in seconds or validate the syntax of your existing record with our fully RFC 7208 compliant SPF tool.

SPF Configuration Panel

Can the domain's A record (main server) send mail?

Can the domain's MX records send mail?

Extra IP Addresses (IPv4 / IPv6)

Enter IP addresses of servers sending mail on your behalf. (IP rules do not count towards DNS lookup limit)

Third-Party Services (Include Domains)

Enter SPF addresses of external services separated by commas. (Each counts as +1 DNS Lookup)

Policy Strictness

IMPORTANT STEP: Add this generated code as a 'TXT' record (Host/Name: @) from your domain's DNS management panel.

Generated TXT Record

DNS Lookups: 0/10

Copied!

v=spf1 mx a ~all

RFC 7208 SPF Syntax Validator

Enter the SPF Record to Validate

RFC 7208 Standards and Email Security

Learn about the standards that govern SPF records and support email authentication.

What is the 10 DNS Lookup Limit?

Per RFC 7208 Section 4.6.4, a receiving server can make a maximum of 10 DNS queries when evaluating your SPF record. Mechanisms like include, a, mx, ptr, exists, and redirect count towards this limit.

Warning: If you use too many 'include' mechanisms and exceed the limit of 10, the record is considered invalid (PermError) and your messages may be rejected.

Why is 'PTR' Usage Not Recommended?

RFC 7208, Section 5.5, advises against using the ptr mechanism because it can create substantial DNS query overhead and cause delays or errors.

Instead, using your static IP addresses (ip4: or ip6:) increases performance and security.

Contact Us for Enterprise Email Migration and Security Infrastructure

Rely on Doz Teknoloji's expertise for Microsoft 365, Google Workspace (G Suite) migration, and advanced email security (SPF, DKIM, DMARC) settings.

Call Now Enterprise Solutions

SecuraWall.com

SPF Record Generator & Validator