Five custom buttons that are in Opportunity stopped working correctly. They start an email to the primary contact in salesforce with a specific email template.
Let us focus on classic. Given bid if it works for classic. We will revise if lightning works.
1) What is the salesforce edition of ur org to understand the design to follow?
2) We will have to rework on the email features for lightning using VFpage/lightning components.
3) Currently they user hit the button it lands to the email content page and then click send button. do they modify any content of the email content?