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fix: use undisclosed-recipients To: header in BCC broadcast (GDPR #1195) #1214

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Merged
superdav42 merged 1 commit into from
May 15, 2026
+9 −8
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fix: use undisclosed-recipients To: header in BCC broadcast (GDPR #1195) #1214

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17 changes: 9 additions & 8 deletions inc/helpers/class-sender.php
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Original file line number Diff line number Diff line change
Expand Up @@ -123,15 +123,15 @@
/*
* Decide which strategy to use, BCC or multiple "to"s.
*
* By default, we use multiple tos, but that can be changed to bcc.
* Depending on the SMTP solution being used, that can make a difference on the number of
* emails sent out.
* Default strategy is BCC. All recipients are placed in the Bcc header so
* no individual address is exposed in the To: field (GDPR/privacy compliance).
* The To: header is set to "undisclosed-recipients:;" per RFC 2822 §3.6.3.
*
* Depending on the SMTP solution being used, BCC vs individual sends can
* make a difference in the number of outbound connections made.
*/
if (apply_filters('wu_sender_recipients_strategy', 'bcc') === 'bcc') {
$main_to = $to[0];

unset($to[0]);

// Place every recipient in BCC — do not expose $to[0] in the visible To: header.
$bcc_array = array_map(
function ($item) {

Expand All @@ -148,7 +148,8 @@

$headers[] = "Bcc: $bcc";

$to = $main_to;
// RFC 2822 §3.6.3 — privacy-safe placeholder when all recipients are BCC'd.
$to = 'undisclosed-recipients:;';
}
} else {
$to = [
Expand All @@ -167,9 +168,9 @@

$attachments = $args['attachments'];

// if (isset($args['schedule'])) {

Check warning on line 171 in inc/helpers/class-sender.php

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// wu_schedule_single_action($args['schedule'], 'wu_send_schedule_system_email', array(

Check warning on line 173 in inc/helpers/class-sender.php

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This comment is 57% valid code; is this commented out code?
// 'to' => $to,
// 'subject' => $subject,
// 'template' => $template,
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