Preventing duplicate email addresses ensures that each person, company, or lead record added to the system has a unique email address. The primary focus on implementing this feature was to improve the integration with Mailchimp by preventing and fixing duplicate email addresses in groups sent to Mailchimp.

Maintaining unique email addresses across various channels of communication is important. An Email address is a reliable central identifier. The uniqueness of email addresses is crucial for achieving a unified view of customer interactions within Sage CRM.

For background see:  (+) Enforcing unique email addresses, Mailchimp and identity matching - Sage CRM Hints, Tips and Tricks - Sage CRM - Community Hub

See:  Preventing users from creating records with the same email address (sagecrm.com)

To enable the detection of duplicate email addresses:

1. Go to <My Profile> | Administration | System | System Behavior
2. Click Change.
3. Set Detect duplicate emails to Yes.
4. Click Save.