Considerations for Send Email Through Gmail™ or Office 365™

• Send through Gmail or Office 365 isn’t available in Communities. If your organization has Send Through Gmail or Office 365 enabled, it doesn’t work in Communities. Instead, emails sent in Communities go through Salesforce or Email Relaying, depending on which option your organization has configured.
• Send through Gmail or Office 365 isn’t available for Einstein Activity Capture or Salesforce Inbox users. With Einstein Activity Capture or Inbox enabled, users’ emails are already sent through their connected Gmail or Outlook account.
• If you use Send through Gmail, visit your My Email Settings page in Salesforce to customize the name that shows in the From field of your outgoing emails. If you use Send through Office 365, you can’t change the name in Salesforce.

When using Send through Gmail or Office 365:

• Emails aren’t stored in Salesforce email logs, which means email delivery information isn’t available in Salesforce. Salesforce email logs are only used for emails sent through Salesforce. Obtain email logs from Gmail or Office 365.
• List emails and emails sent by triggers and workflow rules are still sent through Salesforce.
• Emails sent from organization-wide email addresses are still sent through Salesforce.
• Bounce management isn’t supported, so contacts and leads aren’t automatically updated with bounce information. However, you can view bounced emails in your email inbox. If you require bounce management, use Send through Salesforce instead.
• Transport Layer Security (TLS) is handled through the external email service and not through Salesforce settings.
• Organization-wide footers don’t appear in emails sent from Salesforce.

Note Email integrations aren't available for case management.