Feature Request: io.Reader as attachment

[wshaman]

Short: Add io.Reader as attachment
Motivation: Using any cloud file storage (s3 in my case) you have to

1. read stream from storage
2. save it to file on local disk
3. add local file as attachment to mail (here gomail reads localfile as stream and converts to []byte)

We can reduce amount of conversions and keep code more straight-forward

[ahuret]

Nice idea, but I think it would be better to reuse the existing (appendFile) so that no dupplication here.

It means changing appendFile signature and filename would be an io.Reader (instead of string), and Attach( method would be responsible for converting filename string to io.Reader by opening the file.

What do you think ? :)

[mcbaloo]

@ahuret I have a file URL on a cloud server I want to attach to a mail. How do I implement this?