In your HubSpot account, navigate to Marketing > Email.
Hover over the name of a draft email and click Edit.
In the upper right, click Send test email.
In the right pane, click the Choose one or more recipients dropdown menu to select recipients for your test email.
(Optional) Click the Receive email as specific contact dropdown menu to preview the email as it will appear to a specific contact, which can be helpful when testing how a contact or company personalization token appears in your email.
Why do test emails have Marketing Email Preview Send as the display name?
All test emails are sent from email@example.com with a display name of Marketing Email Preview Send, to protect your email deliverability rates. When you're done testing and you send the email to your contacts, it will be sent with the From name and From address you've specified.