You can send out mass emails to your Contacts or Leads by first creating a report, and then adding your Contacts or Leads to a Campaign.
First, you'll need to create a new report using these steps:
For more information on using reports to add members to your campaign, see Add Campaign Members from Standard and Custom Reports.
By default, My Contacts, My Leads, Active Users, or My Cases views; include all records of that type with an email address.
Guidelines for Sending Mass Email in Salesforce Classic
Considerations for Sending Mass Email in Salesforce Classic
Add Contacts and Leads to Campaigns
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