Now Sage has introduced an additional option to setup multiple email addresses which will be sent as a carbon copy (cc).
You can refer to our blog link to for detail information on setup of email configuration: New Feature with Sage 300 v2017 Patch 2 for Email Settings on Company Profile
New Stuff: Bill Of Lading for Sage 300 ERP V2019 released now
In order to access the screen go to the “Common Services → Company Setup → Company Profile” to open the setup screen. Kindly refer to the screenshot below for the same. 
Once the screen gets open, click on Email tab where you can find “Send Copies To” field which allows you to input an emails address. The email address entered in this field will receive a copy of an email sent for the customer(s) and vendor(s).
Multiple emails addresses are supported by this feature and needs to be separated by semicolon (;).
Save the changes.
So, user can receive copies of emails that are sent to customers and vendors which will help user to store the backup of the sent emails for any internal use/records and also provides a confirmation of an email delivery.
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