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HTTP/2 301
date: Sat, 27 Dec 2025 13:52:01 GMT
content-type: text/html; charset=UTF-8
location: https://docs.gravityforms.com/gf_enable_notification_email_header/
server: cloudflare
strict-transport-security: max-age=604800
strict-transport-security: max-age=31536000; includeSubDomains
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x-content-type-options: nosniff
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x-xss-protection: 1; mode=block
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x-frame-options: SAMEORIGIN
content-security-policy: frame-ancestors 'self';
referrer-policy: no-referrer
referrer-policy: strict-origin-when-cross-origin
x-redirect-by: WordPress
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cf-cache-status: DYNAMIC
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HTTP/2 200
date: Sat, 27 Dec 2025 13:52:02 GMT
content-type: text/html; charset=UTF-8
server: cloudflare
vary: Accept-Encoding
strict-transport-security: max-age=604800
strict-transport-security: max-age=31536000; includeSubDomains
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content-security-policy: frame-ancestors 'self';
referrer-policy: no-referrer
referrer-policy: strict-origin-when-cross-origin
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fastcgi-cache: EXPIRED
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cf-cache-status: DYNAMIC
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cf-ray: 9b494bc7fc22f473-BLR
GF_ENABLE_NOTIFICATION_EMAIL_HEADER - Gravity Forms Documentation
GF_ENABLE_NOTIFICATION_EMAIL_HEADER
Description
This constant enables the X-Gravity-Forms-Source email header for notification emails.
Usage
define( 'GF_ENABLE_NOTIFICATION_EMAIL_HEADER', true );
Placement
This constant should be set in your wp-config.php. See the article WP Config Options for more details.
Source Code
This constant is located in common.php
Since
This filter was added in Gravity Forms 2.9.13