Yes — every notification email from DNR support is threaded so that replying from your normal mail client appends your message to the original ticket.

What to know:

• Reply from the same email address registered on your DNR account. If the sender doesn't match a known user, the message will not be routed back to your ticket.
• Attachments in your reply (within the same file-type and size limits) are imported into the ticket alongside your message.
• Keep the existing subject line / In-Reply-To header so threading works correctly — most mail clients do this automatically.
• If the original ticket has been closed for more than 14 days, a new linked ticket is opened instead of reopening the old one.

You can always check the result by opening the ticket in your dashboard — every inbound email shows as a comment on the thread.