описание почтового адреса (mail addressing description)
Имя (Name)
mailaddr - mail addressing description
Описание (Description)
This manual page gives a brief introduction to SMTP mail
addresses, as used on the Internet. These addresses are in the
general format
user@domain
where a domain is a hierarchical dot-separated list of
subdomains. These examples are valid forms of the same address:
john.doe@monet.example.com
John Doe <john.doe@monet.example.com>
john.doe@monet.example.com (John Doe)
The domain part ("monet.example.com") is a mail-accepting domain.
It can be a host and in the past it usually was, but it doesn't
have to be. The domain part is not case sensitive.
The local part ("john.doe") is often a username, but its meaning
is defined by the local software. Sometimes it is case
sensitive, although that is unusual. If you see a local-part
that looks like garbage, it is usually because of a gateway
between an internal e-mail system and the net, here are some
examples:
"surname/admd=telemail/c=us/o=hp/prmd=hp"@some.where
USER%SOMETHING@some.where
machine!machine!name@some.where
I2461572@some.where
(These are, respectively, an X.400 gateway, a gateway to an
arbitrary internal mail system that lacks proper internet
support, an UUCP gateway, and the last one is just boring
username policy.)
The real-name part ("John Doe") can either be placed before <>,
or in () at the end. (Strictly speaking the two aren't the same,
but the difference is beyond the scope of this page.) The name
may have to be quoted using "", for example, if it contains ".":
"John Q. Doe" <john.doe@monet.example.com>
Abbreviation
Some mail systems let users abbreviate the domain name. For
instance, users at example.com may get away with "john.doe@monet"
to send mail to John Doe. This behavior is deprecated.
Sometimes it works, but you should not depend on it.
Route-addrs
In the past, sometimes one had to route a message through several
hosts to get it to its final destination. Addresses which show
these relays are termed "route-addrs". These use the syntax:
<@hosta,@hostb:user@hostc>
This specifies that the message should be sent to hosta, from
there to hostb, and finally to hostc. Many hosts disregard
route-addrs and send directly to hostc.
Route-addrs are very unusual now. They occur sometimes in old
mail archives. It is generally possible to ignore all but the
"user@hostc" part of the address to determine the actual address.
Postmaster
Every site is required to have a user or user alias designated
"postmaster" to which problems with the mail system may be
addressed. The "postmaster" address is not case sensitive.
Файлы (Files)
/etc/aliases
~/.forward
Смотри также (See also)
mail(1), aliases(5), forward(5), sendmail(8)
IETF RFC 5322 ⟨http://www.ietf.org/rfc/rfc5322.txt⟩
