Отправка сообщения на почту с компа с русским именем

using System;
using System.Net.Mail;
using System.Net.NetworkInformation;
using System.Reflection;
 
namespace MySmtpClientEx
{
 
    /// <summary>
 
    /// An extended <see cref="SmtpClient"/> which sends the
 
    /// FQDN of the local machine in the EHLO/HELO command.
 
    /// </summary>
 
    public class SmtpClientEx : SmtpClient
    {
 
        #region Private Data
 
        private static readonly FieldInfo localHostName = GetLocalHostNameField();
 
        #endregion
 
        #region Constructor
 
        /// <summary>
 
        /// Initializes a new instance of the <see cref="SmtpClientEx"/> class
 
        /// that sends e-mail by using the specified SMTP server and port.
 
        /// </summary>
 
        /// <param name="host">
 
        /// A <see cref="String"/> that contains the name or 
 
        /// IP address of the host used for SMTP transactions.
 
        /// </param>
 
        /// <param name="port">
 
        /// An <see cref="Int32"/> greater than zero that 
 
        /// contains the port to be used on host.
 
        /// </param>
 
        /// <exception cref="ArgumentNullException">
 
        /// <paramref name="port"/> cannot be less than zero.
 
        /// </exception>
 
        public SmtpClientEx(string host, int port)
            : base(host, port)
        {
 
            Initialize();
 
        }
 
        /// <summary>
 
        /// Initializes a new instance of the <see cref="SmtpClientEx"/> class
 
        /// that sends e-mail by using the specified SMTP server.
 
        /// </summary>
 
        /// <param name="host">
 
        /// A <see cref="String"/> that contains the name or 
 
        /// IP address of the host used for SMTP transactions.
 
        /// </param>
 
        public SmtpClientEx(string host)
            : base(host)
        {
 
            Initialize();
 
        }
 
        /// <summary>
 
        /// Initializes a new instance of the <see cref="SmtpClientEx"/> class
 
        /// by using configuration file settings.
 
        /// </summary>
 
        public SmtpClientEx()
        {
 
            Initialize();
 
        }
 
        #endregion
 
        #region Properties
 
        /// <summary>
 
        /// Gets or sets the local host name used in SMTP transactions.
 
        /// </summary>
 
        /// <value>
 
        /// The local host name used in SMTP transactions.
 
        /// This should be the FQDN of the local machine.
 
        /// </value>
 
        /// <exception cref="ArgumentNullException">
 
        /// The property is set to a value which is
 
        /// <see langword="null"/> or <see cref="String.Empty"/>.
 
        /// </exception>
 
        public string LocalHostName
        {
 
            get
            {
 
                if (null == localHostName) return null;
 
                return (string)localHostName.GetValue(this);
 
            }
 
            set
            {
 
                if (string.IsNullOrEmpty(value))
                {
 
                    throw new ArgumentNullException("value");
 
                }
 
                if (null != localHostName)
                {
 
                    localHostName.SetValue(this, value);
 
                }
 
            }
 
        }
 
        #endregion
 
        #region Methods
 
        /// <summary>
 
        /// Returns the price "localHostName" field.
 
        /// </summary>
 
        /// <returns>
 
        /// The <see cref="FieldInfo"/> for the private
 
        /// "localHostName" field.
 
        /// </returns>
 
        private static FieldInfo GetLocalHostNameField()
        {
 
            BindingFlags flags = BindingFlags.Instance | BindingFlags.NonPublic;
 
            return typeof(SmtpClient).GetField("clientDomain", flags);
 
        }
 
        /// <summary>
 
        /// Initializes the local host name to 
 
        /// the FQDN of the local machine.
 
        /// </summary>
 
        private void Initialize()
        {
 
            IPGlobalProperties ip = IPGlobalProperties.GetIPGlobalProperties();
 
            if (!string.IsNullOrEmpty(ip.HostName) && !string.IsNullOrEmpty(ip.DomainName))
            {
 
                this.LocalHostName = ip.HostName + "." + ip.DomainName;
 
            }
 
        }
 
        #endregion
 
    }
 
}

            SmtpClientEx client = new SmtpClientEx("smtp.mail.ru");
            client.Credentials = new NetworkCredential("login", "password");
 
            client.LocalHostName = "mail.ru";
 
            MailMessage message = new MailMessage("from", "to", "theme", "body");
 
            client.Send(message);