msg:mime — Returns the top of the MIME tree for the message, a message part
Returns the top of the MIME tree for the message, a message part. Setting
false, indicates that modifications are going to be made and a MIME tree optimized for modifications is returned. If you attempt to modify a MIME part that is not writable, a runtime error will result. The returned part has a "thread" member that allows easy iteration of the MIME tree.
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