General-Purpose Mail Filter
true if message nmsg is a multipart
Return number of parts in message nmsg, if it is a multipart (MIME) message. If it is not, return ‘1’.
message_is_multipart to check whether the message is a
Extract nth part from the multipart message nmsg. Numeration of parts begins from ‘1’. Return message descriptor referring to the extracted part. Message parts are regarded as messages, so any message functions can be applied to them.
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