### Start with a simple text message:
$msg = MIME::Lite->new(
   From    => 'me@myhost.com',
   To      => 'you@yourhost.com',
   Cc      => 'some@other.com, some@more.com',
   Subject => 'A message with 2 parts...',
   Type    => 'TEXT',
   Data    => "Here's the GIF file you wanted",
);

### Attach a part... the make the message a multipart automatically:
$msg->attach(
   Type     => 'image/gif',
   Path     => 'aaa000123.gif',
   Filename => 'logo.gif',
);

### Send in the "best" way (the default is to use "sendmail"):
$msg->send;
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MIME::Lite is great...and if you add MIME::Types you can use

Type => 'AUTO'
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in your code. This tells MIME::Lite to make a best guess about your attachment types - assuming you're going to have more than one type of attachment (.xls, .csv, .gif, etc).

Jack