My original question was:
     
"I would like to create long names for users in their e-mail addresses. 
     An example:
            jimi.hendrix_at_guitar.play.com
            ^^^^^^^^^^^^
     Is it necessary to do login names with more than 8 characteres? If the
answer is "yes", how can I do it?"
Thanks for all:  
*Leon Troeth <lanks_at_ccds.cc.monash.edu.au>
 Make a mail alias.  Have a look at the file /etc/aliases, and add a line 
 like this:
 jimi.hendrix:jimi
 Where jimi.hendrix is the mail alias and jimi is the user's real login 
 name.  After you edit the file, run the program 
 newaliases
* Gyula Szokoly <szgyula_at_skysrv.Pha.Jhu.EDU>
  No, actually it's not even supported on every platform. You create mail
  aliases instead.
* danno_at_large.com (Dan Notov)
  
  Try man aliases.
  You can create these alias entries in the file /var/adm/sendmail/aliases.
  Aliases are entered in the following form:
        alias: name1, name2, ..., namen.
  So, you can try the following:
        jimi.hendrix:   jhendrix_at_guitar.play.com
  Then, run sendmail -bi to re-create the dbm database files.
* Michel.Royer_at_iut-nantes.univ-nantes.fr (Michel.Royer)
  If hou use sendmail as central mail program, you can use aliases
  ----> man aliases.
* Lucio Chiappetti <lucio_at_ifctr.mi.cnr.it>
  NO, e-mail addresses may be just entries in the aliases file.
  Depending on how your network is set up, this can be a local file on
  the mail hub (/etc/aliases on most systems, /var/adm/sendmail/aliases
  on OSF), or a NIS-mantained network-wide map.
  In the alias file you have just entries of the form :
      nickname: loginname_at_machine
* Herve DEMARTHE (CEA France) <demarthe_at_alpha.cad.cea.fr>
  Just use E-mail aliases. 
  Locally  : /var/adm/sendmail/aliases + newaliases
  With NIS : /car/yp/src/mail.aliases + make
* Benoit Maillard - Digital France- dtn: "858-1243 / ext: 33 1 69 87 12 43"
<maillard_at_atyisa.enet.dec.com>
  Just add an entry in the /etc/aliases file like the following:
  jimi.hendrix:Real_UserName_at_machine.domain
  Then rebuild the aliases database with newaliases(8)
* Murthy Hebbar <murthy_at_dicer.incyte.com>
 You don't have to have the same name for logins. You can map the
corresponding email address with the login name using /etc/aliases.
*David Hoyt <dhoyt_at_oem.net>
 use /usr/adm/sendmail/aliases
 entries follow
 joe.user:	joeu_at_machine.domain.dom
* Matti Saarinen <mjs_at_butler.cc.tut.fi>
        The answer is "no". Only thing you must do is to define alias for
        login name in the mail alias file.
        The location of the alias file is usually under /var/adm/sendmail.
* Jean-Loup.Risler_at_genetique.uvsq.fr (Jean-Loup Risler)
 You must do the following things.
 - Let us suppose your login name is yamamoto (which is probable...)
 - you want your e-mail address to be Futoshi.Yamamoto
 1) in /usr/var/adm/sendmail create a file called revaliases if it does
    not already exist.
    In this file put one line:
  yamamoto: futoshi.yamamoto
   NO blank at the beginning, ONE blank after the :
 2) In the same directory there should be a file called aliases
    Add one line:
  futoshi.yamamoto:yamamoto     WITHOUT any blank
 3) type
  newaliases
  so that the new alias in "aliases" are known
 4) type
 /usr/lib/sendmail -bi -oA/usr/var/adm/sendmail/revaliases
                       ^
                     letter, not zero
   so that the revalias is known
  And that's all. Of course you can add several revaliases and aliases in one
  pass before typing the two above commands.
* rioux_at_ip6480nl.ce.utexas.edu (Tom Rioux)
 look into /usar/var/adm/sendmail/aliases
 man aliases
* huber_at_kodak.com (Ron Huber)
  The simple way is to use aliases.
* Jim Neeland <neeland_at_madmax.hrl.hac.com>
        You may already have received many answers, but, just in case...
 Use the alias facility.  Look at the file /var/adm/sendmail/aliases
 for the format of entries.  After modifying the file, be sure to issue
 the 'newaliases' command to get sendmail to recognize the changes.
----------------------------------------------
| real name:   | Jorge Futoshi Yamamoto      |
| e-mail:      | jorge.yamamoto_at_hcnet.usp.br |
| organization:| CIA - HC - FMUSP            |
| geography:   | Sao Paulo - Brazil          |
----------------------------------------------
******************************************************
"The chicken was the egg's idea for getting more eggs"
Samuel Butler
******************************************************
Received on Thu Oct 03 1996 - 00:47:38 NZST