I Think that there should be way to remove option that e-mail is mandatory for user registration in OJS 3.0.2.0 because when we enter very old articles we have to put invalid mails since either there was no mail at the time or author passed away. If we put fake mail than we can be registered as spammer and our server will have poor reputation.
I Guess that solution is to give us option to not enter mail in those cases.
Please let us know how we can remove in the current code that e-mail is mandatory.
Thanks