Tools

SPF builder for DNS TXT records

Look up the current SPF record for a domain, add approved sending servers, and build one clean TXT value to copy into DNS.

Build a new SPF record

Domain

Enter the root domain. The tool reads public TXT records and keeps the result on this page only.

Start from the current SPF record Keep existing approved senders and add the new ones below.

Add common senders

Microsoft 365 / Exchange Online include:spf.protection.outlook.com Google Workspace include:_spf.google.com Current MX mail servers mx Website A record a

Add other sending servers or SPF mechanisms

One per line. Plain IPs become ip4: or ip6:. Plain domains become include:domain.

Fail policy

Use hard fail only when you are confident every legitimate sender is included.