WP Mail DKIM Sign v1.0.0
DKIM-sign outbound WordPress mail at the WP layer, so a valid DKIM-Signature header is attached before the message reaches your upstream SMTP relay.
Download wpmail-dkim-sign.zip and install via WordPress admin (Plugins → Add New → Upload Plugin), or upload to your wp-content/plugins/ directory.
Sites running a previous version will receive this update automatically via the in-plugin GitHub updater.
See CHANGELOG.md for full release notes.