If you have Edit permissions for marketing emails, you can send a test version of your marketing email to yourself or a team member before you send out the actual email to your contacts.
To send a test email:
Please note: only contact and company personalization tokens can be tested when you use the Receive email as specific contact dropdown menu. If you're creating an automated email and want to test how other record types appear, such as a ticket or deal associated with the recipient, you'll need to test your email directly in the workflows editor.
All test emails are sent from noreply@hubspot.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.