Thanks for pointing this out. For consistency with the rest of the system, I've fixed the code so that it sends the email to the submitting user. There is a patch available at http://pkp.sfu.ca/bugzilla/show_bug.cgi?id=2918
. At some point we'll be addressing a few requests for the ability to CC additional authors on the editorial emails (along with, potentially, the ability for other authors to follow the editorial process with their own user accounts), but we haven't made a final decision yet.
Public Knowledge Project Team
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