In Figure 26.13 in the text, what is the difference between the MAIL FROM in the envelope and the FROM in the header?

Figure 26.13

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Figure 26.13 Format of an e-mail Behrouz Forouzan 20122 Olive Street Bellbury, CA 91000 William Shane Mail From: forouzan@some.com RCPT To: shanew@aNetwork.com 1400 Los Gatos Street San Louis, CA 91005 Behrouz Forouzan From: Behrouz Forouzan 20122 Olive Street To: William Shane Bellbury, CA 91000 Jan. 10, 2011 Date: 1/10/2011 Subject: Network Subject: Network Dear Mr. Shane Dear Mr. Shane We want to inform you that our network is working pro- perly after the last repair. We want to inform you that our network is working pro- perly after the last repair. Yours truly, Behrouz Forouzan Yours truly. Behrouz Forouzan Postal mail Electronic mail Body Header Message Envelope