Settings that you can configure for all the users of email conversation are provided on the Remedyforce Administration > Configure Email > Email Conversation Settings page.
WarningNote
To allow Salesforce organization to send you all types of email messages, ensure that Access Level in the Access to Send Email section is set to All email on the Setup > Email Administration > Deliverability page for Salesforce Classic and Administration > Email > Dilverability page for Lightning Experience.
The following table describes the settings available on the page.