public SmtpEmailSender_Tests()
{
var configuration = Substitute.For<ISmtpEmailSenderConfiguration<int, long>>();
configuration.DefaultFromAddress.Returns("...");
configuration.DefaultFromDisplayName.Returns("...");
configuration.Host.Returns("...");
configuration.Port.Returns(25);
//configuration.Domain.Returns("...");
configuration.UserName.Returns("...");
configuration.Password.Returns("...");
//configuration.EnableSsl.Returns(false);
//configuration.UseDefaultCredentials.Returns(false);
_smtpEmailSender = new SmtpEmailSender<int, long>(configuration);
}