Within Teamwork Desk, you can reply to a customers ticket via your personal email address.
To do this you will first have to update your notification settings so that you receive a notification when there is a new ticket.
Note: In order to reply to Desk tickets from your email, the email address you use will need to be linked with your Teamwork Desk account.
Once this has been enabled, to reply to the customer/ticket you will have to compose your reply within your email client above the initial notification. The notification emails will have a grey bar indicating where to compose your reply.
When you send a reply via your personal email which is linked with your Desk account your reply will show within Teamwork Desk in the ticket thread.
For more information see: Inboxes Overview