SingleEmailMessage:
- The SingleEmailMessage can send message related to only single record.
- setTargetObjectId - The ID of the contact, lead, or user to which the email will be sent.
- Used for single record
- Messaging.SingleEmailMessage
MassEmailMessage:
- MassEmailMessage can send mails related to multiple records (WhatId and TargetObjectId).
- setTargetObjectIds - A list of IDs of the contacts, leads, or users to which the email will be sent.
- Used for multiple records
- Messaging.MassMailMessage
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