Available from version 1.41.0 (Gerrit change 922140)
Called when checking whether a user is allowed to send emails
Define function:
public static function onEmailUserAuthorizeSend( MediaWiki\Permissions\Authority $sender, StatusValue $status ) { ... }
Attach hook: In extension.json:
	"Hooks": {
		"EmailUserAuthorizeSend": "MediaWiki\\Extension\\MyExtension\\Hooks::onEmailUserAuthorizeSend"
Called from: File(s): includes/mail/EmailUser.php
Interface: EmailUserAuthorizeSendHook.php

For more information about attaching hooks, see Manual:Hooks .
For examples of extensions using this hook, see Category:EmailUserAuthorizeSend extensions.