title: System.Net.Mail - Trying to send a mail with attachment to gmail, works but for small attachments only
body: <p>I use this class to send mails trough a gmail account:</p>
  
  <pre><code>public class GmailAccount
      {
          public string Username;
          public string Password;
          public string DisplayName;
  
          public string Address
          {
              get
              {
                  return Username + "@gmail.com";
              }
          }
  
          private SmtpClient client;
  
          public GmailAccount(string username, string password, string displayName = null)
          {
              Username = username;
              Password = password;
              DisplayName = displayName;
  
              client = new SmtpClient
              {
                  Host = "smtp.gmail.com",
                  Port = 587,
                  EnableSsl = true,
                  DeliveryMethod = SmtpDeliveryMethod.Network,
                  UseDefaultCredentials = false,
                  Credentials = new NetworkCredential(Address, password)
              };
          }
  
          public void SendMessage(string targetAddress, string subject, string body, params string[] files)
          {
              MailMessage message = new MailMessage(new MailAddress(Address, DisplayName), new MailAddress(targetAddress))
              {
                  Subject = subject,
                  Body = body
              };
  
              foreach (string file in files)
              {
                  Attachment attachment = new Attachment(file);
                  message.Attachments.Add(attachment);
              }
  
              client.Send(message);
          }
      }
  </code></pre>
  
  <hr>
  
  <p>Here is an example of how I use it:</p>
  
  <pre><code>GmailAccount acc = new GmailAccount("zippoxer", "******", "Moshe");
  acc.SendMessage("zippoxer@gmail.com", "Hello Self!", "like in the title...", "C:\\822d14ah857.r");
  </code></pre>
  
  <p>The last parameter in the <strong>SendMessage</strong> method is the location of an attachment I want to add.</p>
  
  <p>I tried sending a mail with an attachment of 400KB, worked great (even 900KB works). But then I tried uploading an attachment of 4MB, didn't work. Tried 22MB -> didn't work too.</p>
  
  <p>There should be a limit of 25MB per message in Gmail. My message's subject and body are almost empty so don't consider them as part of the message's size. Why do I have that low limit?</p>