Create attachment using io.Reader or io.ReadCloser

[kravemir]

gomail provides function to add attachment using filename:

func (m *Message) Attach(filename string, settings ...FileSetting)

However, this is very much limited to attachments from filesystem, not allowing other attachment content providers.

It would be useful, if it would be possible to add an attachment from:

• io.Reader, which pretty much standard in golang, or
• io.ReadCloser, which would provide shorter way for io.Readers sources, which need close (no need to make own defer,..), and any io.Reader can be converted to io.ReadCloser using ioutil.NopCloser,... or
• []byte, which allows pretty much any attachment content source, but requires more work for callers.

Personally, I would prefer io.ReadCloser, which (in combination with ioutil.NopCloser) would create a versatile API covering the most of the use-cases.

[kravemir]

Closing, as the project is unmaintained, mentioned in: #142, #104, and #108.