Who will this E-mail be from, from me or the organization?
The e-mail message that you send to a chosen recipient will be from the individual or organization's name you specify in the Your Name text box in the Compose an E-mail Message Page.
This is what the recipient will see in the From field of the message when he/she views it.
Similarly, the e-mail address the recipient sees in the From field of the message will be the E-mail you specify in the Your E-mail text box.
This is what the recipient will see in the From field of the message, accompanying the name (see above)