On Apache
Under GNU General Public License
2024-12-12 17:06 @18.223.206.193 CrawledBy Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
MAILADDR(7) Linux User's Manual MAILADDR(7)
NAME
mailaddr - mail addressing description
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 AT monet.com
John Doe <john.doe AT monet.com>
john.doe AT monet.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 AT some.where
machine!machine!name AT some.where
I2461572 AT 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 AT monet.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.
FILES
/etc/aliases
~/.forward
SEE ALSO
mail(1), aliases(5), forward(5), sendmail(8)
IETF RFC 5322 <http://www.ietf.org/rfc/rfc5322.txt>
COLOPHON
This page is part of release 5.10 of the Linux man-pages project. A description of the
project, information about reporting bugs, and the latest version of this page, can be
found at https://www.kernel.org/doc/man-pages/.
4.2 Berkeley Distribution 2020-08-13 MAILADDR(7)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
2024-12-12 17:06 @18.223.206.193 CrawledBy Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)