mailaddr man page on 4.4BSD

Printed from

MAILADDR(7)							   MAILADDR(7)

       mailaddr - mail addressing description

       Mail  addresses	are based on the ARPANET protocol listed at the end of
       this manual page.  These addresses are in the general format


       where a domain is a hierarchical dot separated list of subdomains.  For
       example, the address

       is  normally  interpreted  from right to left: the message should go to
       the ARPA name tables (which do not correspond exactly to	 the  physical
       ARPANET), then to the Berkeley gateway, after which it should go to the
       local host monet.  When the message reaches monet it  is	 delivered  to
       the user ``eric''.

       Unlike some other forms of addressing, this does not imply any routing.
       Thus, although this address is specified as an ARPA address,  it	 might
       travel by an alternate route if that were more convenient or efficient.
       For example, at Berkeley, the  associated  message  would  probably  go
       directly	 to monet over the Ethernet rather than going via the Berkeley
       ARPANET gateway.

       Under certain circumstances it may not be necessary to type the	entire
       domain name.  In general, anything following the first dot may be omit‐
       ted if it is the same as the domain from which you are sending the mes‐
       sage.   For  example,  a	 user on ``'' could send to
       ``eric@monet'' without adding the ``'' since it is the same
       on both sending and receiving hosts.

       Certain	other  abbreviations  may  be permitted as special cases.  For
       example, at Berkeley, ARPANET hosts may be  referenced  without	adding
       the  ``''  as  long	as  their names do not conflict with a
       local host name.

       Certain old address formats are converted to the new format to  provide
       compatibility with the previous mail system.  In particular,


       is allowed and


       is converted to


       to be consistent with the rcp(1) command.

       Also, the syntax


       is converted to:


       This  is normally converted back to the ``host!user'' form before being
       sent on for compatibility with older UUCP hosts.

       The current implementation is not able to route messages	 automatically
       through the UUCP network.  Until that time you must explicitly tell the
       mail system which hosts to send your message through  to	 get  to  your
       final destination.

   Case Distinctions.
       Domain  names (i.e., anything after the ``@'' sign) may be given in any
       mixture of upper and lower case with the exception of  UUCP  hostnames.
       Most  hosts  accept  any	 combination  of  case in user names, with the
       notable exception of MULTICS sites.

       Under some circumstances it may be necessary to route a message through
       several	hosts to get it to the final destination.  Normally this rout‐
       ing is done automatically, but sometimes it is desirable to  route  the
       message	manually.   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.	This path is forced even if there is a
       more efficient path 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@domain'' 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.

   Other Networks.
       Some other networks can be reached by giving the name of the network as
       the  last  component of the domain.  This is not a standard feature and
       may not be supported at all sites.  For example, messages to  CSNET  or
       BITNET	sites	can   often   be   sent	  to   ``user@host.CSNET''  or
       ``user@host.BITNET'' respectively.

       The RFC822 group syntax (``group:user1,user2,user3;'') is not supported
       except  in  the	special case of ``group:;'' because of a conflict with
       old berknet-style addresses.

       Route-Address syntax is grotty.

       UUCP- and ARPANET-style addresses do not coexist politely.

       mail(1), sendmail(8); Crocker, D. H., Standard for the Format  of  Arpa
       Internet Text Messages, RFC822.

4.2 Berkeley Distribution      February 14, 1989		   MAILADDR(7)

List of man pages available for 4.4BSD

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
Vote for polarhome
Free Shell Accounts :: the biggest list on the net