MPK is a simple MIME packaging utility. Unlike
mpack and mmencode from metamail, it allows you to
encode multiple attachments in to a single mail
message. You specify attachment filenames on the
command line and optionaly (with -m) provide a
text message on the standard input (or use the <
operator to get it from a file). A base64 encoded
multipart message stream is produced to the
standard output.
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