NOTE: If you are looking for support to send email alerts to any standard or custom object, please read this article.

The following article explains the process through which you can define a Workflow Process using Flow in Salesforce and send an Email Alert using MassMailer for Lead, Contact, Case, Opportunity, Contact Roles, Account, and User objects. You can track the email status values such as open, click, bounce, spam, unsubscribe, etc. You can also log the activity history. 

1. Lead Object:

    You can learn how to send workflow email alerts to Lead object through MassMailer by going through the article at this link.

2. Contact Object:

    You can learn how to send workflow emails alerts to Contact object through MassMailer by going through the article at this link.

3. Case Object:

    You can learn how to send workflow email alerts to Case object through MassMailer by going through the article at this link.

4. Opportunity Contact Roles, Opportunity Team Members:

    You can learn how to send workflow email alerts to Opportunity Contact Roles, Opportunity Team Members through MassMailer by going through the article at this link.

5. Account Object:

    You can follow the same process defined in the Lead object but define the process on the Account Object.

6. User Object:

    You can follow the same process defined in the Lead object but define the process on the User Object.