v2.4.0

Added

• Control of emails by source (#19–#26). Every queued email is tagged with a source (wp_core:password_reset, plugin:woocommerce…), detected from WordPress filters or the call stack, and the new Sources tab enables or disables each source, a group or a selection.
• Disabled sources are blocked (#19–#26). Their emails are stored as "Blocked by source" and never sent, even with the Instant header; the plugin's own alert source cannot be disabled.
• A pre-filled source catalogue (#19–#26). Every email a stock WordPress sends, plus WooCommerce, Contact Form 7 and WPForms, appears on install, so a source can be switched off before it first fires.
• Filter the Log by source (#19–#26), from a Source column.

Changed

• A more compact admin header and a readable Block-mode banner (#19–#26). The banner was red on red, and its red now meets WCAG AA.

Removed

• Dead CSS rules and an unused container entry (#19–#26).