Hi Trevor, for a domain name that is already registered, you'll need to have the organization establish that mailbox on their web server. Then (most likely) you can use Thunderbird to work with that mailbox.

Hi Have you tried the steps explained here? https://support.mozilla.org/en-US/kb/new-email-address Thunderbird does not itself provide an email address - it usually works with an email address that already exists. However as the support page describes, Thunderbird may help you with creating a custom email with certain partner email providers. However, no guarantee you can use your first choice. If you own that domain (healthytransportation.ca), then ask your domain provider or website contact whether email is included. If it is, you would create the email account you want with them, and then use Thunderbird to connect to it. I hope this helps. Agnes

Hi again I am not sure from the second part of your question whether you actually do already have the email address you want. If you do - then you don't need Thunderbird to create it. Just install Thunderbird as normal and enter your email server details when prompted. https://support.mozilla.org/en-US/kb/automatic-account-configuration or manually if that fails https://support.mozilla.org/en-US/kb/manual-account-configuration Agnes