using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

         string[] allowedDomains = "avectra.com;agilutions.com;mailinator.com".Split(';');

         string recipients = "bob@gmail.com;AGStest@mailinator.com;";

         bool send = allowedDomains.Any((string szDomain) => recipients.IndexOf(szDomain, StringComparison.OrdinalIgnoreCase) > 0);

         Console.WriteLine(send);

​

    }

}