Sending Test Emails
You can send test emails to yourself so you can check how your emails will look before starting the sequence on live prospects.
While viewing your sequence, click Menu -> Send Test Emails.
If your sequence steps have more than 1 email variation, you can select which email variation to test for each step:
Click "Next" -> then select which prospect to use for testing.
Note: No email will be sent to the prospect you selected. Selecting a prospect is only needed so that the attributes in your sequence can resolve to values (eg. first name and company).
You may also want to test your sender score before starting the sequence for real - Testing with mail-tester