You do not need to set up SMTP server credentials or SMTP relay information in CORE to use its email feature. CORE uses its own SMTP server to handle emails securely on your behalf. You can configure your email settings in Global Settings > Email Settings or in User Preferences > Email Settings for outgoing emails (with the option Allow User Preferences to override these email settings in Global Settings). Check CORE Help Center for details.
CORE sends emails from a separate 'CORE Notifications' email address, not any personal or work email address. To track emails sent from CORE using a personal email address, you can include your email address as a CC or BCC email in Global Settings or User Preferences. Do note that you can specify a maximum of 50 recipients for every email you send (combined total of To, CC and BCC recipients). If you need to send emails to more than 50 recipients, then you have to send multiple emails.
You can view the emails only in your associated email account. If you want to view the emails sent out from CORE, say invoices emailed to a client (PDFs), you should enter your email address as Cc or BCc in User Preferences or Global Settings. This will send a copy of all outgoing emails to your inbox. Check CORE Help Center for details.
If you are integrating CORE with your Google or Microsoft Office 365 Outlook/ Hotmail/ account and have a CORE CRM subscription, you can use your own email accounts to send and receive emails in the CORE CRM modules only. Its real-time connection allows you to create emails and calendar events in CORE and see them in the other account.