How to Interpret Email Fields 
 
 Field Name   Field Description 
 To
Line is used to indicate the primary person or persons the mail message is intended for. Usually a name will precede the actual address, though this is certainly not required. The To line may also contain more than one address, each separated by commas. In this case, the mail will be delivered to each address listed in this line as well as the Cc line and the otherwise invisible Bcc line (see Cc and Bcc) There really is no functional difference between an address contained in the Cc or To lines of an email message.
(e.g. manager@yoursite.com, support@yoursite.com)
 From  
This line indicates who the message is from.
(e.g. admin@yoursite.com)
 Cc  
The Cc or "Carbon Copy", line of an email message is used to list all of the people who were sent a copy of the mail message. The message you compose is sent to the person in the To field, of course. But a copy of exactly the same message is also sent to all the addresses listed in the Cc field. Yes, there can be more than one email address in this field, and they all get a copy. To enter more than one address in the Cc field separate them with commas. Or, it may not contain anything at all. When you send a message to more than one address using the Cc field, both the original recipient and all the recipients of the carbon copies see the To and Cc fields including all the addresses in them. This means that every recipient gets to know the email addresses of all the persons that received your message. This is usually not desirable. Nobody likes their email address exposed in public.
(e.g. copy@yoursite.com, another_copy@yoursite.com)
 Bcc  
The long version of Bcc is "Bind carbon copy". The Bcc field helps you deal with the problems created by Cc. As it is the case with the Cc field, a copy of the message goes to every single email address appearing in the Bcc field. The difference is that neither the Bcc field itself nor the email addresses in it appear in any of the copies (and not in the message sent to the person in the To field either). The only recipient address that will be visible to all recipients is the one in the To or Cc field. So, to keep maximum anonymity you can put email addresses in the Bcc field.
(e.g. blind_copy@yoursite.com, my_copy@yoursite.com)
 Reply To  
Since this header is not normally displayed to the reader, it's direct importance is limited. However, like it or not, readers will use the reply-to address to send feedback, manual unsubscribe requests and the like.
(e.g. replies@yoursite.com)
 Return Path  
Your email client will automatically refer to this header line to determine which address to use when replying, or by the mail server when bouncing back undeliverable mail messages or mailer-daemon error messages.
(e.g. bounced@yoursite.com)
 Subject  
This line is used to provide a short description of what the message is about.
 Message Type  
This line tells the receiving email client exactly what MIME type or types are included in the mail message
(e.g. HTML or Plain Text).
 Message  
This is a full description of your message.
 
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