dprokopetz

Sure thing:

Mailer: postsmtp
HostName: canadaholeinoneinsurance.com
cURL Version: 8.12.1
OpenSSL Version: OpenSSL/1.1.1w
OS: Linux sunshine.wpcloud.ca 4.18.0-477.27.2.lve.el7h.x86_64 #1 SMP Wed Oct 11 11:38:37 UTC 2023 x86_64
PHP: Linux 8.1.32 C
PHP Dependencies: iconv=Yes, spl_autoload=Yes, openssl=Yes, sockets=Yes, allow_url_fopen=Yes, mcrypt=No, zlib_encode=Yes
WordPress: 6.7.2 en_US UTF-8
WordPress Theme: Parallax Pro Theme
WordPress Plugins: Query Monitor, IP2Location Country Blocker, Post SMTP, Gravity Forms, Cron GUI, LiteSpeed Cache, LoginPress, Members, Omni Brokers, omni-orders, Popup Maker, Really Simple SSL
WordPress wp_mail Owner: /home/canadaholeinonei/public_html/wp-content/plugins/post-smtp/Postman/PostmanWpMailBinder.php
WordPress wp_mail Filter(s): wp_staticize_emoji_for_email, PostsmtpMailer->get_mail_args
Postman: 3.1.4
Postman Prevent Message Sender Override (Email|Name): No | No
Postman Active Transport: Default (smtp:none:none://localhost:25)
Postman Active Transport Status (Ready|Connected): No | Yes
Postman Deliveries (Success|Fail): 4283 | 1
Postman Email Log (Enabled|Limit|Transcript Size): Yes | 500 | 256

As noted in the initial post, it doesn’t affect all outgoing mail, only mail generated in the specific scenario that wp_mail() is called specifying multiple recipients using an array of email addresses rather than a comma-separated list of email addresses as its first argument. I don’t believe there’s anything in the WordPress core which calls wp_mail() in this way, but some themes or plugins do.