hide smtp settings nav link when configured via env

app/views/shared/_settings_nav.html.erb

@@ -10,7 +10,7 @@
         <%= link_to 'Account', settings_account_path, class: 'text-base hover:bg-base-300' %>
       </li>
       <% unless Docuseal.multitenant? %>
-        <% if can?(:read, EncryptedConfig.new(key: EncryptedConfig::EMAIL_SMTP_KEY, account: current_account)) %>
+        <% if can?(:read, EncryptedConfig.new(key: EncryptedConfig::EMAIL_SMTP_KEY, account: current_account)) && ENV['SMTP_ADDRESS'].blank? %>
           <li>
             <%= link_to 'Email', settings_email_index_path, class: 'text-base hover:bg-base-300' %>
           </li>