UPDATE: In case you upgrade but don't see the <allowViewingOfPasswords> field in the mailConfig.xml, close the file and log in to SmarterMail as a System Admin. Go to any Settings page in SmarterMail and simply save the page. This will write out a new mailConfig.xml file that will include the new field." This is from Derek's post at https://portal.smartertools.com/community/a87728/show-password-in-15_x.aspx
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