public Emails(string subject, IEnumerable <Address> to, IEnumerable <Address> cc, string body)
{
DomainException.When(!string.IsNullOrEmpty(subject), "Subject is required!");
DomainException.When(to.Count() == 0, "Email receiver is required!");
DomainException.When(cc.Count() == 0, "Email copied receiver is required!");
DomainException.When(!string.IsNullOrEmpty(body), "Body is required!");
Subject = subject;
To = to;
Cc = cc;
Body = body;
}