If you'd like to email all of your attendees at once, there are a couple of ways to do it.
Exporting attendee email addresses
You can export your attendee email addresses from the 'Orders' section of your dashboard and copy them into your email client of choice.
For more information on exporting orders, read the help article: How to export your order information.
Connecting Mailchimp
Alternatively, you can connect your Mailchimp account, which will automatically create a mailing list for you on that platform.
For more information on how to connect Mailchimp to your Ticket Tailor account, read the help article How to integrate Mailchimp with Ticket Tailor.