- Plesk for Linux
- Plesk for Windows
Unable to create a DNS record with the underscore symbol "_". The following error appears in Plesk:
PLESK_ERROR: The specified domain name is not valid. You need to specify a valid domain name like domain.com.
According to RFC 1035, underscore symbol is not a part of 'Preferred name syntax', which means that it is not allowed. There is no guarantee it will work properly.
Use names according to Preferred name syntax.