Looking through various articles I was confused by different names of From-headers of email. Now I want to put all aliases of FROM and TO headers into one table.
First of
all it is necessary to understand that email consists of two parts: «envelope» and «content». Quotation from RFC5322:
«In the context of electronic mail, messages
are viewed as having an envelope and contents. The envelope contains whatever
information is needed to accomplish transmission and delivery. (See [RFC5321]
for a discussion of the envelope.) The
contents comprise the object to be delivered to the recipient. This specification applies only to the format
and some of the semantics of message contents.
It contains no specification of the information in the envelope.»
Each of parts contains its own FROM and TO headers/fields. In fact, there are many other
headers (sender, cc, bcc and etc.), I will not consider them all, so read the
RFC.
A content
part consists of two sections: «header»
and «body». Quotation from RFC5321:
«The SMTP content is sent in the SMTP DATA
protocol unit and has two parts: the header section and the body. If the
content conforms to other contemporary standards, the header section consists
of a collection of header fields, each consisting of a header name, a colon,
and data, structured as in the message format specification (RFC 5322 [4]); the
body, if structured, is defined according to MIME (RFC 2045 [21]).»
