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MAILADDR(7)		      Linux User's Manual		   MAILADDR(7)

       mailaddr	- mail addressing description

       This  manual page gives a brief introduction to SMTP mail addresses, as
       used on the Internet.  These addresses are in the general format


       where a domain is a hierarchical	dot separated list of subdomains.  For
       example,	the addresses
	    Eric Allman	<> (Eric Allman)

       are valid forms of the same address.

       The domain part (``'')	may be the name	of an internet
       host, or	it may be a logical mail address.  The domain part is not case

       The  local  part	 (``eric'')  is	 often a user name, but	its meaning is
       defined by the local software.  It can be case sensitive,  but  usually
       isn't.	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:

	    USER%SOMETHING@some.where	       machine!machine!name@some.where

       (These  are,  respectively, an X.400 gateway, a gateway to an arbitrary
       inernal mail system that	lacks proper internet support, an  UUCP	 gate-
       way, and	the last one is	just boring username policy.)

       The  real-name  part (``Eric Allman'') can either be placed first, out-
       side <>,	or last, inside	().  (Strictly speaking	 the  two  aren't  the
       same,  but the difference is outside the	scope of this page.)  The name
       may have	to be quoted using "" if it contains certain characters,  most
       commonly	``.'':

	    "Eric P. Allman" <>

       Many  mail systems let users abbreviate the domain name.	 For instance,
       users at may get away with ``eric@monet'' to send mail  to
       Eric Allman. This behavior is deprecated.

       Under some circumstances	it may be necessary to route a message through
       several hosts to	get it to the final destination.  Normally  this  hap-
       pens  automatically and invisibly, but sometimes	not, particularly with
       old and broken software.	 Addresses which show these relays are	termed
       ``route-addrs.''	 These use the syntax:


       This  specifies that the	message	should be sent to hosta, from there to
       hostb, and finally to hostc.  Some hosts	disregard route-addrs and send
       directly	to hostc.

       Route-addrs  occur frequently on	return addresses, since	these are gen-
       erally augmented	by the software	at each	host.  It is generally	possi-
       ble  to ignore all but the ``user@hostc'' part of the address to	deter-
       mine the	actual sender.

       Every site is required to have a	user or	user alias designated  ``post-
       master''	 to which problems with	the mail system	may be addressed.  The
       ``postmaster'' address is not case sensitive.

   FREQUENTLY ASKED QUESTIONS and	many mirrors store a collection	of FAQs.  Please  find
       and  use	 a nearby FAQ archive; there are dozens	or hundreds around the
       world.  mail/inter-network-guide	explains how to	send mail between many
       different  networks.   mail/country-codes  lists	 the top level domains
       (e.g.  ``no''  is  Norway  and  ``ea''  is   Eritrea).	 mail/college-
       email/part* gives some useful tips on how to locate e-mail addresses.


       binmail(1),  mail(1), mconnect(1), forward(5), aliases(5), sendmail(8),
       vrfy(8),	RFC822 (Standard for the Format	of  Arpa  Internet  Text  Mes-

4.2 Berkeley Distribution	  1995-06-24			   MAILADDR(7)


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