In-Depth Guide on Sending Emails With Apex

Apex enables Salesforce developers to send emails through the platform’s back-end services, including individual messages, bulk communications, template-based emails, triggered notifications, and messages with attachments. Salesforce enforces recipient and field-size limits, with standard organizations generally allowing up to 5,000 external recipients per day for single emails and separately for mass or list emails, while trial and Developer Edition organizations have stricter caps; capacity-reservation methods can help prevent limit-related failures. Single emails use the Messaging.SingleEmailMessage class to define recipients, sender details, subjects, and plain-text or HTML content, whereas mass emails use Messaging.MassEmailMessage with contact IDs and often templates. Templates can incorporate Salesforce merge fields, triggers can send automated messages in response to record events such as new contacts, and attachments can be included through supported Salesforce document, content, or attachment IDs. The material also describes using Mailtrap’s API/SMTP service for external delivery and monitoring, as well as Salesforce debug logs, Apex test classes, and Mailtrap Email Sandbox for safely testing email content and routing without sending messages to real recipients.

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