A Package to enable easy creation of complex multipart emails.
If you look for a simple API for creating such emails,
then Mail_Mime class will probably suffice.
Else you can use Mail_mimePart, which gives you
better control about MIME creation.
If you want to use a special charset encoding (UTF-8 for example) and/or use base64 instead of quoted-printable, you should use the optional array parameter of function get(). See the API documentation for list of options supported. HTH.