If your non admin Salesforce users are not able to view the 'Emails' tab this could mean two possible things:
A. The "Emails" tab isn't in your user's tab set, but is available when you click the "+" sign next to the tabs.
B. The "Emails" tab isn't available in the full list of tabs for the user.
In that case, the User's profile doesn't have sufficient access to the custom "Emails" object.
Here is our support article on making our custom Emails object viewable to all users' profiles, and assigning the user to this updated profile.
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