Use when configuring the outbound Send Email quick action in Lightning Case Feed — creating the action in Setup on Case (Action Type = Send Email), attaching a default Custom email template, setting predefined To/CC/BCC values, wiring QuickAction.QuickActionDefaultsHandler Apex defaults, respecting the Lightning Experience 10-file / 25 MB attachment limits, and letting agents move an email to a different case. Trigger keywords: Send Email quick action, case email composer, Email action missing from Case Feed, Don't Apply Template Subject, QuickActionDefaultsHandler, SendEmailQuickActionDefaults, move email to another case. NOT for Email-to-Case inbound routing, routing addresses, or thread-ID matching (use admin/email-to-case-configuration), NOT for authoring or migrating the templates themselves (use admin/email-templates-and-alerts and admin/classic-email-template-migration), and NOT for Apex Messaging.SingleEmailMessage sends outside Case Feed.
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