نباید مشکلی باشه.
در کنفیگ بیرون </system.web>
<system.net>
<mailSettings>
<smtp from="fakhr@a-velayat.com">
<network host="mail.a-velayat.com" password="67k55ry" userName="fakhr@a-velayat.com"/>
</smtp>
</mailSettings>
</system.net>
ارسال
System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage("to@a-velayat.com", "fakhravary@gmail.com");
mail.Body = CKEditor1.Text;
mail.Subject = TextBox1.Text.ToString().Trim();
mail.BodyEncoding = Encoding.UTF8;
mail.SubjectEncoding = Encoding.UTF8;
mail.IsBodyHtml = true;
SmtpClient c = new SmtpClient();
c.Host = "to@a-velayat.com";
c.Send(mail);