boolean_smtp_mail_headers

filter Tier A Since 1.0.0

Return a MailHeaders instance, or an array of header lines or name/value pairs, to replace it.

Signature

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

Parameters

Parameter	Type	Description
$headers	\BooleanSmtp\Services\Mailer\Headers\MailHeaders	Header bag parsed from the message's raw headers.
$message	\BooleanSmtp\Services\Mailer\MailMessage	Message the headers belong to.

Returns \BooleanSmtp\Services\Mailer\Headers\MailHeaders — The filtered headers.

Fires in

• app/Services/Mailer/BooleanSmtpMailPipeline.php:311 — BooleanSmtp\Services\Mailer\BooleanSmtpMailPipeline::applyHeaderPipeline()

Example

boolean_smtp_mail_headers.php

add_filter( 'boolean_smtp_mail_headers', function ( \BooleanSmtp\Services\Mailer\Headers\MailHeaders $headers, \BooleanSmtp\Services\Mailer\MailMessage $message ) {
    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.