How do I setup host name for subdomains and mail service

The user is seeking help in setting up a host name for subdomains and mail service. They mention that the wildcard is only valid for one subdomain and they are experiencing issues with email verification. They are unsure of what to enter for the hostname. Solution: To set up a host name for subdomains and mail service, you need to specify the appropriate DNS records for your subdomains. If you want email verification to work for all subdomains, you can try entering "*.vrtuhub.com" as the hostname. This should allow both the main domain and subdomains to work properly.