email

var (
	// ErrEmptyUsername is returned when the username is empty.
	ErrEmptyUsername = errors.New("username cannot be empty")
	// ErrEmptyPassword is returned when the password is empty.
	ErrEmptyPassword = errors.New("password cannot be empty")
	// ErrEmptyHost is returned when the host is empty.
	ErrEmptyHost = errors.New("host cannot be empty")
	// ErrEmptyPort is returned when the port is empty.
	ErrEmptyPort = errors.New("port cannot be empty")
	// ErrEmptyLogger is returned when the logger is nil.
	ErrEmptyLogger = errors.New("logger cannot be nil")
)