/// <summary>
/// Constructor.
/// </summary>
/// <param name="options">The SMTP server options.</param>
/// <param name="serviceProvider">The service provider to use when resolving services.</param>
public SmtpServer(ISmtpServerOptions options, IServiceProvider serviceProvider)
{
_options = options;
_serviceProvider = serviceProvider;
_sessions = new SmtpSessionManager(this);
_endpointListenerFactory = serviceProvider.GetServiceOrDefault(EndpointListenerFactory.Default);
}