The error message in this image mentions that each domain label can start and end with alphanumeric characters, and each domain label can only be separated by hyphens
However, the command below to be executed
edit 1 e/alexyeoh@com-com
but not this command is not allowed
edit 1 e/alexyeoh@1-1
Both start and end with alphanumeric characters for the domain label, and both are only separated by hyphens, so both should be valid according to the error message given but the actual behaviour differs.
The error message in this image mentions that each domain label can start and end with alphanumeric characters, and each domain label can only be separated by hyphens
However, the command below to be executed
edit 1 e/alexyeoh@com-com
but not this command is not allowed
edit 1 e/alexyeoh@1-1
Both start and end with alphanumeric characters for the domain label, and both are only separated by hyphens, so both should be valid according to the error message given but the actual behaviour differs.