E-mail sending using Gmail

I've developed an email application which can be 开发者_Python百科consist of several attachment.size of those attachments could be 20MB or even higher and i'm using smtp.gmail.com as my host.my issue is it's very slow.i think it may because attachments are uploaded when the Send() mail function is called.is there any option to solve this issue?

The bottleneck is your Internet connection upload speed.

The only way to resolve this issue is to lease a faster Internet connection.

On most broadband connections, you should expect this upload to take at least 100 seconds (200k per second upload).

Web Email Clients (Like Gmail) get around this with asynchronous uploaders. The attachment begins uploading as soon as you select it (even while you are still typing out the rest of your email, before you hit send). Unfortunately, I do not believe there is an API that allows async file upload to GMail for this purpose.

With that said, you may be able to do an async upload to another server, and simply link to that file in the emails that you are sending.