I am having issue with Sending attachment with size more than 5 MB

[anomepani]

I am having an issue with Sending attachment with size more than 5 MB in Dot Net using Gmail API. I am using GSuite account and want to extend this limit, How can I achieve this. If a working demo is available that would be very helpful.

[jskeet]

Please could you give more information about exactly what's happening? Please include your source code and the precise error you're seeing.

[LindaLawton]

Which upload type are you using? uploadType=media has a limit of max 5 mb you need to use either uploadType=multipart or uploadType=resumable if you want to attach larger files.

IIR there is a hard limit of attachments on gmail is 50 mb.

[anomepani]

SendEmail.cs Frontend Code for Send mail.txt

I have attached source code file which I am using for uploading a file and also added code for front end in which using jquery ajax I am uploading a file using Web API. Error Logs and stacktrace.txt

[jskeet]

Okay, I see you're using the Users.messages:send method, which has a documented 35MB limit - so it should be okay with "just a bit more than 5MB".

I suspect Linda's right, and the problem is that you're using the method that uses the uploadType=media approach. Instead of populating a Google.Apis.Gmail.v1.Data.Message with the Raw property, create a MemoryStream with the raw content of the data (not base64-encoded or anything - just the binary data) and pass that to the other overload of the Stream. You'll then need to call the Upload method on the returned object. This will use uploadType=resumable and manage the upload for you.

For more information on this sort of upload, see https://developers.google.com/gmail/api/guides/uploads

[anomepani]

I have reviewed, I didn't fully understand how to use it and don't find any sample demo or way to use this overloaded method for how I pass attachment as stream and for contentType which information I have to set. It would be very helpful if the sample example for uploadType=resumableis available.

[jskeet]

As per the linked documentation, the mime type would be "message/rfc822".

For the stream, you're already creating a MimeMessage - so write that to a MemoryStream, then rewind it:

MemoryStream stream = new MemoryStream();
mailMessage.WriteTo(stream);
stream.Position = 0;
// Pass stream into the Send method

[anomepani]

Hi, we have updated our code as per your requested changed Using overload method we are not getting any error but also we are not able to receive an email as well. I am not sure what missing from my side. Please see my attached updated code. UpdatedCode_With_Stream_Send_Mail.txt

[jskeet]

You're not calling the Upload method - that's the media upload equivalent of Execute, effectively.

[anomepani]

@jskeet Thank you very much for quick response. Now I am able to send message upto 35MB. So 35MB is hard limit for sending email using Gmail API. message.

[jskeet]

Yes, that's the limit as per the documentation. Closing this issue now.

[jskeet]

@shiranZe: It's not clear to me what we're meant to take from your comment. As noted in earlier comments, the 35MB restriction is as documented.

[keithtmccartney]

Hi, we have updated our code as per your requested changed Using overload method we are not getting any error but also we are not able to receive an email as well. I am not sure what missing from my side. Please see my attached updated code. UpdatedCode_With_Stream_Send_Mail.txt

This thread has helped me out, your sample code here has been incredibly helpful; many thanks.