Keeping your CRM free from duplicate records is an industry best practice which prevents incorrect record mappings, mismatching data, accidental record creation, and confusion for your team.
Deduping in Outreach
Outreach is designed to allow one prospect record per unique e-mail address. For example, if a user attempts to create new records in Outreach which have duplicate email addresses, one record will import per email address, while the other records with the duplicate email addresses will fail to import.
Record Creation from Outreach to Salesforce
When Outreach attempts to create new records in Salesforce through the plugin, Outreach will first look for a corresponding record in Salesforce by using the email address as the key. If a corresponding record is found for the Lead or Contact, Outreach will map to the existing record. Otherwise, the new record will be created. This is another way Outreach prevents your Salesforce instance from duplicate record creation.
If both a Lead and Contact are found in Salesforce with the same email address, Outreach will map to whichever object is listed first on the Plugin's "Types" page. Looking at the example below, the prospect will be mapped to the Contact object, since the Contact is listed above the Lead.