carrierwave

https://github.com/carrierwaveuploader/carrierwave

Ruby

Classier solution for file uploads for Rails, Sinatra and other Ruby web frameworks

Mail::Message#add_mime_version

Creates a new empty Mime Version field and inserts it in the correct order
into the Header.  The MimeVersion object will automatically generate
set itself to '1.0' if you try and encode it or output it to_s without
specifying a version yourself.

It will preserve any date you specify if you do.

Source | Google | Stack overflow

Edit

git clone [email protected]:carrierwaveuploader/carrierwave.git

cd carrierwave

open

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-Mail--Message-add_mime_version-for-pr

# Commit to git

git add git commit -m "better docs for Mail::Message#add_mime_version"

# Open pull request

gem install hub # on a mac you can `brew install hub`

hub fork

git push <your name> -your-name--update-docs-Mail--Message-add_mime_version-for-pr

hub pull-request

# Celebrate!