You can send emails to a list via a feature called 'Send List Email.'
This feature allows you to send an email blast (up to 5000 per day) to a List View of Contacts. The 'Send List Email' button can be seen on any Contact List View on the top right. You may select individuals via the check box on the far left or select everyone.
Once clicked, an email dialog box will appear where you can populate the content as desired.
Tip: To email everyone on a report, run the report and add the resulting records to a campaign. Then send a list email to that campaign.