Sending large emails with Gmail API

I’m only writing this note because I’ve literally been working on this for 4 hours and there’s zero documentation.

If you want to send an email with attachments that’s more than ~5mb using the .Net Gmail API, you’re out of luck…. but not really. It’s actually EASIER. I don’t know why in the heck they decided to do this, but here’s the code:

  MimeKit.MimeMessage mimeMessage = MimeMessage.CreateFromMailMessage(msg);
           
            MemoryStream stream = new MemoryStream();
            mimeMessage.WriteTo(stream);
            stream.Position = 0;

            var message1 = new Google.Apis.Gmail.v1.Data.Message();

            try
            {
                var email2 = await service.Users.Messages.Send(message1, msg.From.Address, stream, "message/rfc822").UploadAsync();
                return email2.Status.ToString();
            }
            catch (Exception e)
            {
                return e.Message;
            }

Instead of sending it raw and doing all that idiotic conversion, you just make your mime message and push it as a stream using “Upload” instead of “Execute”. Seriously. WTF? There are about 1000000 examples of the Execute() version, but I couldn’t find a single one of the Upload().

Hours and Hours of wasted time.

I hope this saves someone a few minutes.