Available from version 1.27.0 (Gerrit change 242791)
Called in UserMailer::send() to give extensions a chance to split up an email with multiple of the To: field into separate emails.
Define function:
public static function onUserMailerSplitTo( array &$to ) { ... }
Attach hook: In extension.json:
	"Hooks": {
		"UserMailerSplitTo": "MediaWiki\\Extension\\MyExtension\\Hooks::onUserMailerSplitTo"
Called from: File(s): mail/UserMailer.php
Function(s): send
Interface: UserMailerSplitToHook.php

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

Details edit

  • &$to: array of MailAddress objects; unset the ones which should be mailed separately