Send Email with Attachment in C++

Sending email with attachments from C#, attachments arrive as Part 1.2 in Thunderbird

Explicitly filling in the ContentDisposition fields did the trick.

if (attachmentFilename != null)
{
    Attachment attachment = new Attachment(attachmentFilename, MediaTypeNames.Application.Octet);
    ContentDisposition disposition = attachment.ContentDisposition;
    disposition.CreationDate = File.GetCreationTime(attachmentFilename);
    disposition.ModificationDate = File.GetLastWriteTime(attachmentFilename);
    disposition.ReadDate = File.GetLastAccessTime(attachmentFilename);
    disposition.FileName = Path.GetFileName(attachmentFilename);
    disposition.Size = new FileInfo(attachmentFilename).Length;
    disposition.DispositionType = DispositionTypeNames.Attachment;
    message.Attachments.Add(attachment);                
}

BTW, in case of Gmail, you may have some exceptions about ssl secure or even port!

smtpClient.EnableSsl = true;
smtpClient.Port = 587;

Send email with an attachment

I had make it to work...
Referred here: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required?
as suggested by @ymonad.

namespace SendEmail
{
    class Email
    {
        public static void Main(string[] args)
        {
            try
            {
                using (MailMessage mail = new MailMessage())
                {
                    mail.From = new MailAddress("harish.1138@gmail.com");
                    mail.To.Add("harish_1138@yahoo.com");
                    mail.Subject = "Test Mail - 1";
                    mail.Body = "mail with attachment";

                    System.Net.Mail.Attachment attachment;
                    attachment = new System.Net.Mail.Attachment("C:\\EmailTest.xlsx");
                    mail.Attachments.Add(attachment);

                    using (SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com", 587))
                    {
                        SmtpServer.UseDefaultCredentials = false; //Need to overwrite this
                        SmtpServer.Credentials = new System.Net.NetworkCredential("harish.1138@gmail.com", "SamplePWD");
                        SmtpServer.EnableSsl = true;
                        SmtpServer.Send(mail);
                    }
                }

                MessageBox.Show("Mail Sent");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }
    }
}

And have to Turn on less secure apps as here:
https://stackoverflow.com/a/38024407/5266708

And it works perfectly...

Can I send files via email using MailKit?

Yes. This is explained in the documentation as well as the FAQ.

From the FAQ:

How do I create a message with attachments?

To construct a message with attachments, the first thing you'll need to do is create a multipart/mixed container which you'll then want to add the message body to first. Once you've added the body, you can then add MIME parts to it that contain the content of the files you'd like to attach, being sure to set the Content-Disposition header value to the attachment. You'll probably also want to set the filename parameter on the Content-Disposition header as well as the name parameter on the Content-Type header. The most convenient way to do this is to simply use the MimePart.FileName property which
will set both parameters for you as well as setting the Content-Disposition header value to attachment if it has not already been set to something else.

var message = new MimeMessage ();
message.From.Add (new MailboxAddress ("Joey", "joey@friends.com"));
message.To.Add (new MailboxAddress ("Alice", "alice@wonderland.com"));
message.Subject = "How you doin?";

// create our message text, just like before (except don't set it as the message.Body)
var body = new TextPart ("plain") {
    Text = @"Hey Alice,

What are you up to this weekend? Monica is throwing one of her parties on
Saturday. I was hoping you could make it.

Will you be my +1?

-- Joey
"
};

// create an image attachment for the file located at path
var attachment = new MimePart ("image", "gif") {
    Content = new MimeContent (File.OpenRead (path)),
    ContentDisposition = new ContentDisposition (ContentDisposition.Attachment),
    ContentTransferEncoding = ContentEncoding.Base64,
    FileName = Path.GetFileName (path)
};

// now create the multipart/mixed container to hold the message text and the
// image attachment
var multipart = new Multipart ("mixed");
multipart.Add (body);
multipart.Add (attachment);

// now set the multipart/mixed as the message body
message.Body = multipart;

A simpler way to construct messages with attachments is to take advantage of the
BodyBuilder class.

var message = new MimeMessage ();
message.From.Add (new MailboxAddress ("Joey", "joey@friends.com"));
message.To.Add (new MailboxAddress ("Alice", "alice@wonderland.com"));
message.Subject = "How you doin?";

var builder = new BodyBuilder ();

// Set the plain-text version of the message text
builder.TextBody = @"Hey Alice,

What are you up to this weekend? Monica is throwing one of her parties on
Saturday. I was hoping you could make it.

Will you be my +1?

-- Joey
";

// We may also want to attach a calendar event for Monica's party...
builder.Attachments.Add (@"C:\Users\Joey\Documents\party.ics");

// Now we just need to set the message body and we're done
message.Body = builder.ToMessageBody ();

For more information, see Creating Messages.

Adding attachments using url in mail with C sharp

It works fine and mail directly reaches inbox instead of spam.. also can able to attach files from serverpath. Thank you everyone who wish to answer my questions..

    {
        try
        {

            MailMessage mail = new MailMessage();
            mail.From = new MailAddress("mymail@gmail.com");
            mail.To.Add("tomail@gmail.com");
            
            //set the content 
            string filename = "Report1";

            string fileurl = Server.MapPath("..");
            fileurl = fileurl + @"\mailserver\pdf\generated\" + filename + ".pdf";

            //mail.Attachments.Add(new Attachment(fileurl));
            
            if (!string.IsNullOrEmpty(fileurl))
            {
                Attachment attachment = new Attachment(fileurl, MediaTypeNames.Application.Pdf);
                ContentDisposition disposition = attachment.ContentDisposition;
                disposition.CreationDate = File.GetCreationTime(fileurl);
                disposition.ModificationDate = File.GetLastWriteTime(fileurl);
                disposition.ReadDate = File.GetLastAccessTime(fileurl);
                disposition.FileName = Path.GetFileName(fileurl);
                disposition.Size = new FileInfo(fileurl).Length;
                disposition.DispositionType = DispositionTypeNames.Attachment;
                mail.Attachments.Add(attachment);
            }

            mail.Subject = "Subject Text";
            mail.Body = "Body Text";

            //send the message 
            SmtpClient smtp = new SmtpClient("smtpout.****.******server.net");

            NetworkCredential Credentials = new NetworkCredential("mymail@gmail.com", "Password@123");
            smtp.Credentials = Credentials;
            
            //smtp.EnableSsl = true;
            smtp.Send(mail);
            
            Response.Write("<center><span style='color:green'><b>Mail has been send successfully!</b></span></center>");
        }
        catch (Exception ex)
        {
            //Response.Write("<center><span style='color:red'><b>"+ ex + "</b></span></center>");

            Response.Write("<center><span style='color:red'><b>Failed to send a mail...Please check your mail id or Attachment missing</b></span></center>");
        }
    }

C# How to send email with attachment from a remote website

You would need to download the file and add it as an attachment as you have already done.

Somthing like

string localFilename = @"c:\localpath\tofile.jpg";
using(WebClient client = new WebClient())
{
    client.DownloadFile("http://www.example.com/image.jpg", localFilename);
}

will download the file.

---

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