Using a reader to attach a file

[dtrehas]

In some cases the file to be attached is a file that is already open, or the input is a network resource with no way to store it somewhere. So it could be a great to attach using an io.Reader.
Thank you for your wonderful project.

[xhit]

Hi.

It's posible.

Currently I'm busy, but I can work on this before August end.

Also, If you have some progress, I will review PR.

Thanks!

[renom]

Was it implemented?

[xhit]

Not implemented yet. PR is welcome