Pike Manual

With zero arguments, you will get a dummy message without either headers or body. Not very useful.
With one argument, the argument is taken to be a byte stream containing a message in encoded form. The constructor will analyze the string and extract headers and body.
With two or three arguments, the first argument is taken to be the raw body data, and the second argument a desired set of headers. The keys of this mapping are not case-sensitive. If the given headers indicate that the message should be of type multipart, an array of Message objects constituting the subparts should be given as a third argument.

METHOD: MIME.Message.getencoded - Obtain encoded body data
SYNTAX: string getencoded();
DESCRIPTION: This method returns the data of the message body entity, encoded using the current transfer encoding. You should never have to call this function.
SEE ALSO

METHOD: MIME.Message.get_filename - Get supplied filename for body data
SYNTAX: string get_filename();
DESCRIPTION: This method tries to find a suitable filename should you want to save the body data to disk. It will examine the filename attribute of the Content-Disposition header, and failing that the name attribute of the Content-Type header. If neither attribute is set, the method returns 0.
NOTE: An interactive application should always query the user for the actual filename to use. This method may provide a reasonable default though.

METHOD: MIME.Message.is_partial - Identify <tt>message/partial</tt> message
SYNTAX: array(string|int) is_partial();
DESCRIPTION: If this message is a part of a fragmented message (i.e. has a Content-Type of message/partial), an array with three elements is returned. The first element is an identifier string. This string should be used to group this message with the other fragments of the message (which will have the same id string). The second element is the sequence number of this fragment. The first part will have number 1, the next number 2 etc. The third element of the array is either the total number of fragments that the original message has been split into, or 0 of this information was not available. If this method is called in a message that is not a part of a fragmented message, it will return 0.
SEE ALSO

METHOD: MIME.Message.setboundary - Set boundary parameter
SYNTAX: void setboundary(string boundary);
DESCRIPTION: Sets the boundary parameter of the Content-Type header. This is equivalent of calling msg->setparam("boundary", boundary).
SEE ALSO

METHOD: MIME.Message.setcharset - Set charset parameter
SYNTAX: void setcharset(string charset);
DESCRIPTION: Sets the charset parameter of the Content-Type header. This is equivalent of calling msg->setparam("charset", charset).
SEE ALSO

METHOD: MIME.Message.setdisp_param - Set Content-Disposition parameters
SYNTAX: void setdisp_param(string param, string value);
DESCRIPTION: Set or modify the named parameter of the Content-Disposition header. A common parameters is e.g. filename. It is not allowed to modify the Content-Disposition header directly, please use this function instead.
SEE ALSO

METHOD: MIME.Message.setparam - Set Content-Type parameters
SYNTAX: void setparam(string param, string value);
DESCRIPTION: Set or modify the named parameter of the Content-Type header. Common parameters include charset for text messages, and boundary for multipart messages. It is not allowed to modify the Content-Type header directly, please use this function instead.
SEE ALSO