| http://www.w3.org/ns/prov#value | - BRIEF DESCRIPTION OF THE DRAWINGS The foregoing and other exemplary aspects and advantages will be better understood from the following detailed description of the exemplary embodiments of the invention with reference to the drawings, in which: FIG. 1 illustrates a simple mail transfer protocol (SMTP) architecture 1000 of a conventional electronic mail system; FIG. 2 illustrates an example of an S
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