Linux.com

mailaddr.7

MAILADDR

Section: Linux User's Manual (7)
Updated: 2004-09-15
Index Return to Main Contents
 

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:

        This e-mail address is being protected from spambots. You need JavaScript enabled to view it

       Eric Allman < This e-mail address is being protected from spambots. You need JavaScript enabled to view it >

        This e-mail address is being protected from spambots. You need JavaScript enabled to view it (Eric Allman)

The domain part ("monet.berkeley.edu") 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 ("eric") 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 ("Eric Allman") 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 ".":

       "Eric P. Allman" < This e-mail address is being protected from spambots. You need JavaScript enabled to view it >
 

Abbreviation.

Many mail systems let users abbreviate the domain name. For instance, users at berkeley.edu may get away with "eric@monet" to send mail to Eric Allman. 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

binmail(1), mail(1), mconnect(1), aliases(5), forward(5), sendmail(8), vrfy(8)

RFC 2822 (Internet Message Format)  

COLOPHON

This page is part of release 3.21 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


 

Index

NAME
DESCRIPTION
Abbreviation.
Route-addrs.
Postmaster.
FILES
SEE ALSO
COLOPHON

 

Comments

Subscribe to Comments Feed

Upcoming Linux Foundation Courses

  1. LFD320 Linux Kernel Internals and Debugging
    03 Nov » 07 Nov - Virtual
    Details
  2. LFS416 Linux Security
    03 Nov » 06 Nov - Virtual
    Details
  3. LFS426 Linux Performance Tuning
    10 Nov » 13 Nov - Virtual
    Details

View All Upcoming Courses

Become an Individual Member
Check out the Friday Funnies

Sign Up For the Linux.com Newsletter


Who we are ?

The Linux Foundation is a non-profit consortium dedicated to the growth of Linux.

More About the foundation...

Frequent Questions

Join / Linux Training / Board