attachments

Allows you to add attachments to an email, like so:

mail.attachments['filename.jpg'] = File.read('/path/to/filename.jpg')

If you do this, then Mail will take the file name and work out the mime type. It will also set the Content-Type, Content-Disposition, and Content-Transfer-Encoding, and encode the contents of the attachment in Base64.

You can also specify overrides if you want by passing a hash instead of a string:

mail.attachments['filename.jpg'] = {mime_type: 'application/gzip',
                                    content: File.read('/path/to/filename.jpg')}

If you want to use encoding other than Base64 then you will need to pass encoding type along with the pre-encoded content as Mail doesn’t know how to decode the data:

file_content = SpecialEncode(File.read('/path/to/filename.jpg'))
mail.attachments['filename.jpg'] = {mime_type: 'application/gzip',
                                    encoding: 'SpecialEncoding',
                                    content: file_content }

You can also search for specific attachments:

# By Filename
mail.attachments['filename.jpg']   # => Mail::Part object or nil

# or by index
mail.attachments[0]                # => Mail::Part (first attachment)