In Salesforce, which action doesn't require pre-configuration to be performed?

The action of sending an email in Salesforce is often designed to be straightforward and does not inherently require extensive pre-configuration. In many scenarios, users can initiate an email directly from various Salesforce records without needing to set up complex features or configurations.

Sending an email can be performed using the built-in email functionality available on record pages, such as from the Activity tab or through the Salesforce mobile app. This ease of access makes it a practical choice for quick communication within the platform, allowing users to engage directly with clients or stakeholders without needing to dive into additional setup steps or configurations.

In contrast, the other actions listed each involve a level of pre-configuration. Building a custom app requires planning and setup through the App Builder, creating database triggers necessitates understanding Apex programming and configuring them adequately to respond to specific events, and generating reports might involve setting up reports, selecting fields, and possibly defining filters in advance. Thus, the action of sending emails stands out as the one that can typically be done without prior setup, highlighting its user-friendly nature within Salesforce.