{
    "mode": "man",
    "parameter": "MAILADDR",
    "section": "",
    "url": "https://www.chedong.com/phpMan.php/man/MAILADDR/json",
    "generated": "2026-10-22T13:29:02Z",
    "sections": {
        "NAME": {
            "content": "mailaddr - mail addressing description\n",
            "subsections": []
        },
        "DESCRIPTION": {
            "content": "This  manual page gives a brief introduction to SMTP mail addresses, as used on the Internet.\nThese addresses are in the general format\n\nuser@domain\n\nwhere a domain is a hierarchical dot-separated list of subdomains.  These examples are  valid\nforms of the same address:\n\njohn.doe@monet.example.com\nJohn Doe <john.doe@monet.example.com>\njohn.doe@monet.example.com (John Doe)\n\nThe  domain  part  (\"monet.example.com\") is a mail-accepting domain.  It can be a host and in\nthe past it usually was, but it doesn't have to be.  The domain part is not case sensitive.\n\nThe local part (\"john.doe\") is often a username, but its meaning  is  defined  by  the  local\nsoftware.  Sometimes it is case sensitive, although that is unusual.  If you see a local-part\nthat looks like garbage, it is usually because of a gateway between an internal e-mail system\nand the net, here are some examples:\n\n\"surname/admd=telemail/c=us/o=hp/prmd=hp\"@some.where\nUSER%SOMETHING@some.where\nmachine!machine!name@some.where\nI2461572@some.where\n\n(These  are,  respectively,  an X.400 gateway, a gateway to an arbitrary internal mail system\nthat lacks proper internet support, an UUCP gateway, and the last one is just boring username\npolicy.)\n\nThe real-name part (\"John Doe\") can either be  placed  before  <>,  or  in  ()  at  the  end.\n(Strictly  speaking  the  two aren't the same, but the difference is beyond the scope of this\npage.)  The name may have to be quoted using \"\", for example, if it contains \".\":\n\n\"John Q. Doe\" <john.doe@monet.example.com>\n",
            "subsections": [
                {
                    "name": "Abbreviation",
                    "content": "Some mail systems let users abbreviate the domain name.  For instance, users  at  example.com\nmay  get  away  with \"john.doe@monet\" to send mail to John Doe.  This behavior is deprecated.\nSometimes it works, but you should not depend on it.\n"
                },
                {
                    "name": "Route-addrs",
                    "content": "In the past, sometimes one had to route a message through several hosts  to  get  it  to  its\nfinal  destination.   Addresses  which show these relays are termed \"route-addrs\".  These use\nthe syntax:\n\n<@hosta,@hostb:user@hostc>\n\nThis specifies that the message should be sent to hosta, from there to hostb, and finally  to\nhostc.  Many hosts disregard route-addrs and send directly to hostc.\n\nRoute-addrs  are  very  unusual  now.   They  occur  sometimes  in  old mail archives.  It is\ngenerally possible to ignore all but the \"user@hostc\" part of the address  to  determine  the\nactual address.\n"
                },
                {
                    "name": "Postmaster",
                    "content": "Every site is required to have a user or user alias designated \"postmaster\" to which problems\nwith the mail system may be addressed.  The \"postmaster\" address is not case sensitive.\n"
                }
            ]
        },
        "FILES": {
            "content": "/etc/aliases\n~/.forward\n",
            "subsections": []
        },
        "SEE ALSO": {
            "content": "mail(1), aliases(5), forward(5), sendmail(8)\n\nIETF RFC 5322\n\n4.2 Berkeley Distribution                    2023-10-31                                  mailaddr(7)",
            "subsections": []
        }
    },
    "summary": "mailaddr - mail addressing description",
    "flags": [],
    "examples": [],
    "see_also": [
        {
            "name": "mail",
            "section": "1",
            "url": "https://www.chedong.com/phpMan.php/man/mail/1/json"
        },
        {
            "name": "aliases",
            "section": "5",
            "url": "https://www.chedong.com/phpMan.php/man/aliases/5/json"
        },
        {
            "name": "forward",
            "section": "5",
            "url": "https://www.chedong.com/phpMan.php/man/forward/5/json"
        },
        {
            "name": "sendmail",
            "section": "8",
            "url": "https://www.chedong.com/phpMan.php/man/sendmail/8/json"
        }
    ]
}