How do I add my email provider to SPF?

Select your provider from the checkboxes (Google Workspace, Microsoft 365, etc.) or use the custom field to add any include: mechanism. Each provider has a specific SPF include hostname — the builder uses the correct one for each service.

What happens if I exceed 10 DNS lookups in SPF?

Receiving mail servers return permerror when SPF evaluation exceeds 10 lookups, which DMARC treats as SPF failure. Use SPF flattening (replacing include: mechanisms with explicit IP ranges) or remove unnecessary includes to stay within the limit.

Can I use the SPF builder for multiple sending services?

Yes — the builder is designed for this. Select all services that send email on behalf of your domain. The lookup counter shows how many of your 10 available lookups each addition uses, warning when you approach the limit.

Free Email Tool

SPF Record Builder

Select your sending services to build a valid SPF record. Automatically tracks the 10-lookup DNS limit.

SPF Record Builder

Select your sending services to build a valid SPF record. Automatically tracks the 10 DNS lookup limit.

Select your sending services

Add custom include or IP

Ending mechanism

~all (softfail — recommended) -all (hardfail) ?all (neutral)

DNS lookups: 0 / 10

Generated SPF Record

v=spf1 ~all

All Tools

DKIM Checker DKIM Key Generator SPF Validator SPF Record Builder DMARC Checker DMARC Generator Blacklist Checker Header Analyzer MX Lookup PTR Lookup Email Validator TXT Record Lookup BIMI Checker Subject Line Tester Bounce Rate Calc List Hygiene Calc Domain Health Check

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SPF Record Builder: Combine All Sending Services in One Record

A correct SPF record requires knowing the exact include: hostname for every service that sends email on your behalf, and tracking how many DNS lookups those includes cost. This builder handles both — providing the correct include mechanisms for 14 major providers and displaying a live lookup counter so you never accidentally exceed the 10-lookup limit.

Common SPF Include Mechanisms

Service	SPF include	Lookups
Google Workspace	include:_spf.google.com	~3 nested
Microsoft 365	include:spf.protection.outlook.com	~2 nested
SendGrid	include:sendgrid.net	1
Mailchimp/Mandrill	include:spf.mandrillapp.com	1
Amazon SES	include:amazonses.com	1

After building, validate with the SPF Validator to confirm the record looks up correctly in DNS.

SPF Record Builder

SPF Record Builder

SPF Record Builder: Combine All Sending Services in One Record

Common SPF Include Mechanisms

INFRASTRUCTURE

OPERATIONAL NOTES

The Hidden Cost of Retry Pressure in High-Volume SMTP Systems

Inbox Placement Is a Lagging Indicator

What Breaks First When Volume Increases Too Fast

Why Shared IP Pools Fail at Scale

Separating Cold, Bulk, and Transactional Traffic at the Infrastructure Level

When NOT to Warm an IP

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