There are several things that are included in the header of an email. The most important things to include are the recipient and the subject.
the email address of the receiver, the header and the message
If you have the email, check for some form of a timestamp on the email in the header or somewhere on the email.
On the Email itself, look for "Original" or "Headers". Every email program is different.
The sender's email address is included automatically as the sender. Well, yes and no. Most email clients such as Thunderbird allow you to set up multiple email addresses and send emails from any of them. So you could set up fake @fake.com as a second address, then send emails from that and your real address would not be included in the header, although other information that could be used to track you may be.
Message Header
The std::pow() function can be found in the <cmath> header.
Header file is a file which is meant to be included into another file during compilation. Examples: string.h, stdio.h, inttypes.h. Header pointer is a pointer to an object called header (for example header of a linked list).
All functions are included without graphics.h.The graphic parameters will not be included.
to merge the content of a file included
I guess you wanted to ask which header is to be included for string functions. It's string.h
The Header (username)WebsiteOrganization
Your ISP can help. You should email them with the full details of the email header.