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For each attachment that is appended inline and has a target image Raley will add the TARGET image as a regular file attachment. This way, if your email client is able to handle inline attachments properly - everything will work smoothly. But if your client is tricky like (MS Outlook), then the target image will still appear as a separate attachment - only the embedded thumbnail link won't work.
$jirassimo.getNewElements($from, $to)
Returns a java.util.List that you can later iterate on which contains all values from $to that are not present in $from.
Both, $from and $to should be comma-separate values. Empty strings and nulls are allowed