In order to send Custom Emails to your Guests, you need to first add a Confirmation Email on your Group's Settings. This email will act as the message's sender. Without one, emails cannot go out.
In order to add a confirmation email, navigate to your Group > Settings > Organization.
Once in your Organization Settings, look for the option that reads Confirmation Email Customization. Here, enter the sender email you would like to use.
After an email is added, you will see the status change to Pending.
At the same time, you will receive an email to that inbox from Amazon Web Services, our third party email service provider. The email will ask you to authorize the user of Amazon WS by clicking on the URL available with in the body of the email.
- If the email is not received you can always re-trigger the email by clicking on "Resend Confirmation email".
- Ensure to check all inbox folders, including Spam.
- If behind a VPN or Firewall, ensure to check the firewall's traffic and verify the email is not being held up
Once verified the email confirmation on the Boomset Group dashboard will change to verified. 
Please note the confirmation email is separate from the email address added under The General Information section. The email address added under the general information section is the email address that is tied to your organization as general information.
When the email is verified, you will be able to start designing and delivering your emails to your Guests.
For any questions or clarifications about this process, feel free to reach Support at support@boomset.com.