Currently they are stored with a recipient user_id set to 0, see for example User:Okeyes in http://www.mediawiki.org/w/index.php?title=User_talk:LWelling&diff=prev&oldid=656919
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- bz46046
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Looks like the code only saves the user_id, so pretty much any action where it's 0, it should be ignored/skipped/whatever, as there's no way to differentiate between anon/non existent users...
In the maintenance script:
$userId = intval( $row->eeb_user_id );
if ( $userId && $userId > $startUserId ) {
$emailBatch = MWEchoEmailBatch::newFromUserId( $userId );