Setting up and using a custom email system involves creating a custom email address that uses your own domain (for example, youremail@yourdomain.com).

1. Register a domain: The first step is to register a domain name if you don't already have one. You can do this through online domain registrars.
2. Choose an email service provider: Choose an email service provider that allows you to configure and manage personalized emails.
3. Configure the email service: Register with the email service you have chosen and follow its instructions to configure your domain. This usually involves verifying domain ownership, setting up specific DNS records, and defining email accounts.
4. Configure DNS records: Access your domain registrar's control panel and configure the DNS records recommended by your email service provider. These records typically include MX records (for mail delivery), SPF records (for authentication), DKIM records, and TXT records (for verification and security).
5. Create custom email accounts: In your email service provider, create the custom email accounts you want. For example, you can create youremail@yourdomain.com and other accounts according to your needs.
6. Set up an email client: To send and receive emails, you can set up an email client such as Microsoft Outlook, Mozilla Thunderbird, or use the web interface provided by your email service provider. You will need to enter the email address and password for the custom account you created.
7. Start sending and receiving emails: Once you have configured the email client or are using the web interface, you can start sending and receiving emails from your personalized accounts.
8. Manage your personalized emails: Use the tools provided by your email service provider to manage your accounts, configure filters, set email signatures, and manage the security of your personalized email.
9. Training and support: If you have any questions or encounter difficulties, consult the documentation provided by your email service provider or contact their technical support for help.

Remember that the exact settings may vary depending on the email service provider you choose, so it is important to follow their specific instructions to set up and use your custom email system effectively.