{
    "mode": "man",
    "parameter": "mailaddr",
    "section": "7",
    "url": "https://www.chedong.com/phpMan.php/man/mailaddr/7/json",
    "generated": "2026-06-03T03:33:38Z",
    "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 ⟨http://www.ietf.org/rfc/rfc5322.txt⟩\n",
            "subsections": []
        },
        "COLOPHON": {
            "content": "This  page  is  part  of  release  5.10 of the Linux man-pages project.  A description of the\nproject, information about reporting bugs, and the latest version of this page, can be  found\nat https://www.kernel.org/doc/man-pages/.\n\n\n\n4.2 Berkeley Distribution                    2020-08-13                                  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"
        }
    ]
}