No biggie, and quite documented but I'd like to point this out anyway.
If you're not having any email configuration button in the settings area, then you have probably upgraded from CRM 2011 and the button isn't part of the sitemap. The solution is to add the following to you sitemap right aftert the <SubArea ID="nav_audit"...> tag,
<SubArea Id="nav_social" ResourceId="Social_SubArea_Title" DescriptionResourceId="Social_SubArea_Description" Icon="/_imgs/area/16_social.png" Url="/tools/social/social_area.aspx" AvailableOffline="false" />
It's pretty logic that you should add the social nav to get email configuration. Read more at
Developer at CRM-Konsulterna