boolean_smtp_email_headers

filter Tier A Since 1.0.0

Return a modified array to change what is recorded.

Signature

add_filter( 'boolean_smtp_email_headers', $callback, 10, 2 );

Parameters

Parameter	Type	Description
$headers	array<string, string>	Custom header name/value pairs collected from PHPMailer.
$to	string	Primary recipient address.

Returns array<string, string> — The filtered headers.

Fires in

• app/Services/Mailer/MailerManager.php:321 — BooleanSmtp\Services\Mailer\MailerManager::configure()

Example

boolean_smtp_email_headers.php

add_filter( 'boolean_smtp_email_headers', function ( array $headers, string $to ) {
    return $headers;
}, 10, 2 );

Next steps

• Mail pipeline — every hook in this area, in firing order where that applies.
• Hook Explorer — filter and search every hook.