An additional embeds parameter is added to wp_mail in 6.9. This doesn't break any existing functionality but would be good to keep feature parity with core.
https://make.wordpress.org/core/2025/09/04/prettier-emails-supporting-inline-embedded-images/
An additional
embedsparameter is added towp_mailin 6.9. This doesn't break any existing functionality but would be good to keep feature parity with core.https://make.wordpress.org/core/2025/09/04/prettier-emails-supporting-inline-embedded-images/