56. A non-transitory computer-readable storage medium storing instructions for transmitting an electronic document, the instructions causing one or more computer processors at an intermediate computer that is remote from an electronic device sending a message to perform operations comprising: receiving the message, the message including a document including metadata, automatically creating a cleansed version of the document by removing at least a portion of the metadata from the document, replacing the document received with the message with the cleansed version of the document, and transmitting the message with the cleansed version of the document.
56. A non-transitory computer-readable storage medium storing instructions for transmitting an electronic document, the instructions causing one or more computer processors at an intermediate computer that is remote from an electronic device sending a message to perform operations comprising: receiving the message, the message including a document including metadata, automatically creating a cleansed version of the document by removing at least a portion of the metadata from the document, replacing the document received with the message with the cleansed version of the document, and transmitting the message with the cleansed version of the document. 61. The storage medium of claim 56 , wherein automatically creating a cleansed version of the document further includes removing only pre-specified types of metadata in accordance with a cleansing policy.