{"id":24,"date":"2021-01-08T17:53:08","date_gmt":"2021-01-08T08:53:08","guid":{"rendered":"https:\/\/ubuntu.auctionpro.co.kr\/?page_id=24"},"modified":"2026-10-25T18:30:44","modified_gmt":"2026-10-25T09:30:44","slug":"install-postfix-on-ubuntu","status":"publish","type":"page","link":"https:\/\/ubuntu.auctionpro.co.kr\/?page_id=24","title":{"rendered":"Ubuntu Postfix \uc124\uce58 \uac00\uc774\ub4dc \u2014 SMTP \ubc1c\uc1a1\u00b7\ub9b4\ub808\uc774\u00b7TLS\u00b7\uc624\ub958 \ud574\uacb0"},"content":{"rendered":"\n\n

Postfix\ub294 \uc774\uba54\uc77c\uc744 \ubc1b\uc544 \ub2e4\uc74c \uba54\uc77c \uc11c\ubc84\ub85c \uc804\ub2ec\ud558\ub294 SMTP \uc11c\ubc84\uc785\ub2c8\ub2e4.<\/strong> \uc774 \ubb38\uc11c\ub294 Ubuntu\uc758 \ub85c\uceec \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0\uc11c \uba54\uc77c\uc744 \ubcf4\ub0b4\ub294 \uae30\ubcf8 \uad6c\uc131\uacfc \uc678\ubd80 SMTP \ub9b4\ub808\uc774 \uc5f0\uacb0\uc744 \uc124\uba85\ud569\ub2c8\ub2e4. \uc778\ud130\ub137 \uc218\uc2e0 \uc11c\ubc84\uc640 \uc0ac\uc6a9\uc790 \ub85c\uadf8\uc778\uc6a9 SMTP \uc11c\ubc84\ub97c \uc644\uc131\ud558\ub824\uba74 \ubcc4\ub3c4 \uad6c\uc131\uc774 \ud544\uc694\ud569\ub2c8\ub2e4.<\/p>\n

\"\uba54\uc77c
\uc11c\ubc84 \uc6b4\uc601 \ud658\uacbd \uc608\uc2dc \uc0ac\uc9c4. Taylor Vick<\/a> \/ Unsplash. \uc2e4\uc81c \uc0ac\uc774\ud2b8\uc758 \uc11c\ubc84 \uc0ac\uc9c4\uc740 \uc544\ub2d9\ub2c8\ub2e4.<\/figcaption><\/figure>\n

\ubaa9\ucc28<\/h2>
  1. \uc5ed\ud560\uacfc \uad6c\uc131 \uc120\ud0dd<\/a><\/li>
  2. Ubuntu \uc124\uce58<\/a><\/li>
  3. \ub85c\uceec \ubc1c\uc1a1\uc6a9 \uae30\ubcf8 \uc124\uc815<\/a><\/li>
  4. \uc678\ubd80 SMTP \ub9b4\ub808\uc774 \uc5f0\uacb0<\/a><\/li>
  5. \uc778\ud130\ub137 \uc218\uc2e0\uacfc 587 \uc778\uc99d\uc758 \ucc28\uc774<\/a><\/li>
  6. DNS\uc640 \ubc1c\uc1a1 \uc2e0\ub8b0\ub3c4<\/a><\/li>
  7. \ubc1c\uc1a1 \uc2dc\ud5d8\u00b7\ub85c\uadf8\u00b7\uc624\ub958 \ud574\uacb0<\/a><\/li><\/ol>\n

    1. Postfix\uc758 \uc5ed\ud560\uacfc \uad6c\uc131 \uc120\ud0dd<\/h2>\n
    \ubaa9\uc801<\/th>\uad6c\uc131<\/th>\ucd94\uac00 \uc900\ube44<\/th><\/tr><\/thead>
    \uc6f9 \uc11c\ubc84 \uc54c\ub9bc \ubc1c\uc1a1<\/td>\ub85c\uceec \uc571 \u2192 Postfix \u2192 \uc678\ubd80 SMTP \uc81c\uacf5\uc790<\/td>\ub9b4\ub808\uc774 \uacc4\uc815\u00b7\ubc1c\uc2e0 \ub3c4\uba54\uc778 \uc778\uc99d<\/td><\/tr>
    \uc9c1\uc811 \uc678\ubd80 \ub3c4\uba54\uc778\uc73c\ub85c \ubc1c\uc1a1<\/td>\ub85c\uceec \uc571 \u2192 Postfix \u2192 \uc218\uc2e0 \ub3c4\uba54\uc778\uc758 MX<\/td>\uc544\uc6c3\ubc14\uc6b4\ub4dc 25\ubc88, PTR, IP \ud3c9\ud310, DNS \uc778\uc99d<\/td><\/tr>
    \uc790\uccb4 \ub3c4\uba54\uc778 \uc218\uc2e0<\/td>\uc678\ubd80 \uba54\uc77c \uc11c\ubc84 \u2192 Postfix \u2192 \uba54\uc77c\ud568<\/td>MX\u00b7\uc218\uc2e0\uc790\u00b7\uba54\uc77c\ud568\u00b7\uc2a4\ud338 \uac80\uc0ac<\/td><\/tr>
    PC\u00b7\uc2a4\ub9c8\ud2b8\ud3f0\uc5d0\uc11c \uba54\uc77c \ubc1c\uc1a1<\/td>\uba54\uc77c \uc571 \u2192 \uc778\uc99d\ub41c 587\/465 \uc11c\ube44\uc2a4<\/td>SASL \uc778\uc99d\uacfc TLS \uc124\uc815<\/td><\/tr><\/tbody><\/table>\n

    Postfix \uc124\uce58\ub9cc\uc73c\ub85c IMAP \uba54\uc77c \uc77d\uae30\uac00 \uc81c\uacf5\ub418\uc9c0\ub294 \uc54a\uc2b5\ub2c8\ub2e4. \uba54\uc77c\ud568 \uc870\ud68c\uc5d0\ub294 Dovecot \uac19\uc740 \ubcc4\ub3c4 \uc11c\ube44\uc2a4\uac00 \ud544\uc694\ud569\ub2c8\ub2e4. \uc544\ub798 example.com\uacfc mail.example.com\uc740 \uc124\uba85\uc6a9 \ub3c4\uba54\uc778\uc774\ubbc0\ub85c \uc18c\uc720\ud55c \ub3c4\uba54\uc778\uc73c\ub85c \ubc14\uafc9\ub2c8\ub2e4.<\/p>\n

    2. Ubuntu\uc5d0 \uc124\uce58<\/h2>\n
    cat \/etc\/os-release\nsudo apt update\napt-cache policy postfix\nsudo apt install postfix libsasl2-modules ca-certificates\npostconf mail_version\nsudo systemctl status postfix --no-pager<\/code><\/pre>\n
    \uc124\uce58 \uc911 \uae30\ubcf8 \uc720\ud615\uc744 \uc120\ud0dd\ud558\ub294 \ud654\uba74\uc774 \ud45c\uc2dc\ub420 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc9c1\uc811 SMTP \ubc1c\uc1a1\uc744 \uc704\ud55c \ucd9c\ubc1c\uc810\uc740 Internet Site\uc774\uace0, \uc678\ubd80 \uc11c\ubc84\ub97c \uacbd\uc720\ud558\ub294 \uad6c\uc131\uc740 Satellite system \ub4f1 \ubaa9\uc801\uc5d0 \ub9de\ub294 \uc720\ud615\uc744 \uc120\ud0dd\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc5ec\uae30\uc11c\ub294 \uc124\uce58 \ud6c4 \uc124\uc815\uc744 \uba85\uc2dc\uc801\uc73c\ub85c \ud655\uc778\ud569\ub2c8\ub2e4. System mail name\uc5d0\ub294 \ubcf4\ud1b5 \ubc1c\uc2e0 \uc8fc\uc18c\uc758 \ub3c4\uba54\uc778\uc778 example.com\uc744 \uc785\ub825\ud569\ub2c8\ub2e4.<\/p>\n
    \uae30\uc874 \uc124\uce58 \ud654\uba74 \ucc38\uace0<\/h3>\n
    \ub2e4\uc74c\uc740 \uae30\uc874 \ubb38\uc11c\uc758 \uc124\uce58 \ud654\uba74\uc785\ub2c8\ub2e4. \uacfc\uac70 Ubuntu \ud654\uba74\uc774\ubbc0\ub85c \ud604\uc7ac \uc124\uce58 \ud504\ub85c\uadf8\ub7a8\uc758 \ubb38\uad6c\uc640 \uc21c\uc11c\ub294 \ub2e4\ub97c \uc218 \uc788\uc73c\uba70, \ud654\uba74 \uc18d \ub3c4\uba54\uc778 \uac12\uc744 \uadf8\ub300\ub85c \uc0ac\uc6a9\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/p>\n
    \"\uae30\uc874
    \uae30\uc874 \uc124\uce58 \ud654\uba74 1 \u2014 \uc2e4\uc81c \ud658\uacbd\uc758 \ub3c4\uba54\uc778\uacfc \uc6a9\ub3c4\uc5d0 \ub9de\uac8c \uc124\uc815\ud569\ub2c8\ub2e4.<\/figcaption><\/figure>
    \"\uae30\uc874
    \uae30\uc874 \uc124\uce58 \ud654\uba74 2 \u2014 \uc2e4\uc81c \ud658\uacbd\uc758 \ub3c4\uba54\uc778\uacfc \uc6a9\ub3c4\uc5d0 \ub9de\uac8c \uc124\uc815\ud569\ub2c8\ub2e4.<\/figcaption><\/figure>
    \"\uae30\uc874
    \uae30\uc874 \uc124\uce58 \ud654\uba74 3 \u2014 \uc2e4\uc81c \ud658\uacbd\uc758 \ub3c4\uba54\uc778\uacfc \uc6a9\ub3c4\uc5d0 \ub9de\uac8c \uc124\uc815\ud569\ub2c8\ub2e4.<\/figcaption><\/figure>\n
    \uc124\uce58 \uc9c8\ubb38\uc744 \ub2e4\uc2dc \ubcf4\uace0 \uc2f6\uc73c\uba74 \ub2e4\uc74c \uba85\ub839\uc744 \uc0ac\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uae30\uc874 \uc6b4\uc601 \uc124\uc815\uc774 \ubcc0\uacbd\ub420 \uc218 \uc788\uc73c\ubbc0\ub85c \uba3c\uc800 \ubc31\uc5c5\ud569\ub2c8\ub2e4.<\/p>\n
    sudo dpkg-reconfigure postfix<\/code><\/pre>\n
    3. \ub85c\uceec \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \ubc1c\uc1a1\uc6a9 \uae30\ubcf8 \uc124\uc815<\/h2>\n
    \ubcc0\uacbd \uc804\uc5d0 main.cf\uc640 master.cf\ub97c \ubcc4\ub3c4 \uc774\ub984\uc73c\ub85c \ubc31\uc5c5\ud569\ub2c8\ub2e4. \uc544\ub798 .before-guide \ud30c\uc77c\uc774 \uc774\ubbf8 \uc788\ub2e4\uba74 \ub2e4\ub978 \uc774\ub984\uc73c\ub85c \uc800\uc7a5\ud558\uc138\uc694.<\/p>\n
    sudo cp -a \/etc\/postfix\/main.cf \/etc\/postfix\/main.cf.before-guide\nsudo cp -a \/etc\/postfix\/master.cf \/etc\/postfix\/master.cf.before-guide\nsudo postconf -n\nsudo vi \/etc\/postfix\/main.cf<\/code><\/pre>\n
    \uc544\ub798\ub294 \uad00\ub828 \ud56d\ubaa9\ub9cc \uc815\ub9ac\ud55c \uc608\uc2dc\uc785\ub2c8\ub2e4. main.cf \uc804\uccb4\ub97c \uc774 \ub0b4\uc6a9\uc73c\ub85c \ub36e\uc5b4\uc4f0\uc9c0 \ub9d0\uace0 \uae30\uc874 \ud56d\ubaa9\uc744 \uc218\uc815\ud569\ub2c8\ub2e4. \uc911\ubcf5 \ud56d\ubaa9\uc744 \ucd94\uac00\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/p>\n
    myhostname = mail.example.com\nmydomain = example.com\nmyorigin = $mydomain\n\nmydestination = $myhostname, localhost.$mydomain, localhost\nmynetworks = 127.0.0.0\/8, [::1]\/128\ninet_interfaces = loopback-only\n\nsmtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination\nrelayhost =\nsmtp_tls_security_level = may<\/code><\/pre>\n
    \ud56d\ubaa9<\/th>\uc758\ubbf8<\/th><\/tr><\/thead>
    myhostname<\/td>SMTP \uc11c\ubc84\uc758 \uc804\uccb4 \ud638\uc2a4\ud2b8\uba85. world \uac19\uc740 \uc9e7\uc740 \uc774\ub984\ubcf4\ub2e4 mail.example.com \ud615\ud0dc \uc0ac\uc6a9<\/td><\/tr>
    myorigin<\/td>\ub3c4\uba54\uc778\uc774 \uc5c6\ub294 \ub85c\uceec \ubc1c\uc2e0 \uc8fc\uc18c\uc5d0 \ubd99\uc77c \ub3c4\uba54\uc778<\/td><\/tr>
    mydestination<\/td>\uc774 \uc11c\ubc84\uac00 \ucd5c\uc885 \uc218\uc2e0\uc9c0\ub85c \ucc98\ub9ac\ud560 \ub3c4\uba54\uc778. \ubc1c\uc1a1 \ud5c8\uc6a9 \ubaa9\ub85d\uc774 \uc544\ub2d8<\/td><\/tr>
    mynetworks<\/td>\ubcc4\ub3c4 \uc778\uc99d \uc5c6\uc774 \ub9b4\ub808\uc774\ub97c \uc2e0\ub8b0\ud560 \uc811\uc18d \uc6d0\ubcf8<\/td><\/tr>
    inet_interfaces<\/td>SMTP \uc811\uc18d\uc744 \ubc1b\uc744 \uc778\ud130\ud398\uc774\uc2a4<\/td><\/tr>
    relayhost<\/td>\ub2e4\uc74c \ub2e8\uacc4 \ubc1c\uc1a1\uc744 \ub9e1\uae38 SMTP \uc11c\ubc84. \ube44\uc5b4 \uc788\uc73c\uba74 \uc77c\ubc18\uc801\uc73c\ub85c \ubaa9\uc801\uc9c0 MX\ub85c \uc9c1\uc811 \uc804\ub2ec<\/td><\/tr><\/tbody><\/table>\n
    example.com \uba54\uc77c\ud568\uc744 \ub2e4\ub978 \uc81c\uacf5\uc790\uc5d0\uc11c \uc6b4\uc601\ud55c\ub2e4\uba74 \uc774\ub97c mydestination\uc5d0 \ucd94\uac00\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \uc798\ubabb \ucd94\uac00\ud558\uba74 \uac19\uc740 \ub3c4\uba54\uc778\uc73c\ub85c \ubcf4\ub0b4\ub294 \uba54\uc77c\uc744 \uc678\ubd80 \uc81c\uacf5\uc790 \ub300\uc2e0 \ub85c\uceec\uc5d0\uc11c \ucc98\ub9ac\ud558\ub824\uace0 \ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. mynetworks\uc5d0 0.0.0.0\/0\uc774\ub098 \ubd88\ud544\uc694\ud55c \ub300\uc5ed\uc744 \ub123\uc73c\uba74 \uc624\ud508 \ub9b4\ub808\uc774 \uc704\ud5d8\uc774 \uc0dd\uae41\ub2c8\ub2e4.<\/p>\n
    \uc774 \uad6c\uc131\uc740 \ub85c\uceec\uc5d0\uc11c\ub9cc SMTP\ub97c \ubc1b\uc2b5\ub2c8\ub2e4. \ub2e4\ub978 \uc6f9 \uc11c\ubc84\ub098 PC\uac00 \uc5f0\uacb0\ud574\uc57c \ud55c\ub2e4\uba74 \ubcc4\ub3c4\uc758 \uc2e0\ub8b0 IP \uc81c\ud55c \ub610\ub294 \uc778\uc99d \uc81c\ucd9c \uc11c\ube44\uc2a4\ub97c \uc124\uacc4\ud574\uc57c \ud569\ub2c8\ub2e4.<\/p>\n
    sudo postfix check\nsudo systemctl restart postfix\nsudo ss -ltnp | grep ':25'\nsudo postconf -n<\/code><\/pre>\n
    \uc124\uc815 \uac80\uc0ac \uc624\ub958\ub97c \ud574\uacb0\ud55c \ub4a4 \uc7ac\uc2dc\uc791\ud569\ub2c8\ub2e4. inet_interfaces \ubcc0\uacbd\uc740 restart\uac00 \ud544\uc694\ud558\uba70 \uadf8 \ubc16\uc758 \ub9ce\uc740 \uc124\uc815\uc740 postfix reload\ub85c \uc801\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. IPv6\ub97c \uc0ac\uc6a9\ud560 \uacbd\uc6b0 \uc8fc\uc18c\u00b7\ub77c\uc6b0\ud305\u00b7DNS\ub3c4 \ud568\uaed8 \ud655\uc778\ud558\uace0, \uc0ac\uc6a9\ud558\uc9c0 \uc54a\ub294 IPv6 \uc1a1\uc2e0 \uacbd\ub85c\ub97c \ubc29\uce58\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/p>\n
    4. \uc678\ubd80 SMTP \ub9b4\ub808\uc774\ub97c \ud1b5\ud55c \ubc1c\uc1a1<\/h2>\n
    \ud638\uc2a4\ud305\uc5d0\uc11c 25\ubc88 \uc1a1\uc2e0\uc774 \uc81c\ud55c\ub418\uac70\ub098 \ubc1c\uc1a1 \uc11c\ube44\uc2a4\ub97c \uc774\uc6a9\ud560 \uacbd\uc6b0 \uc81c\uacf5\uc790\uac00 \uc9c0\uc815\ud55c 587 STARTTLS \uc11c\ubc84\ub97c \uc0ac\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc544\ub798 smtp.provider.example\uc740 \uc2e4\uc81c \uc11c\ubc84 \uc8fc\uc18c\ub85c \ubc14\uafd4\uc57c \ud569\ub2c8\ub2e4.<\/p>\n
    relayhost = [smtp.provider.example]:587\nsmtp_sasl_auth_enable = yes\nsmtp_sasl_password_maps = hash:\/etc\/postfix\/sasl_passwd\nsmtp_sasl_security_options = noanonymous\nsmtp_sasl_tls_security_options = noanonymous\nsmtp_tls_security_level = verify\nsmtp_tls_CAfile = \/etc\/ssl\/certs\/ca-certificates.crt<\/code><\/pre>\n
    verify\ub294 \uc554\ud638\ud654\uc640 \uc6d0\uaca9 \uc11c\ubc84 \uc778\uc99d\uc11c \uac80\uc99d\uc744 \uc694\uad6c\ud569\ub2c8\ub2e4. \uc811\uc18d \ud638\uc2a4\ud2b8\uba85\uc774 \uc81c\uacf5\uc790\uc758 \uc778\uc99d\uc11c \uc774\ub984\uacfc \ub9de\uc544\uc57c \ud569\ub2c8\ub2e4. 465 \uc554\uc2dc\uc801 TLS \uc11c\ube44\uc2a4\ub294 \ubcc4\ub3c4 wrapper mode \uad6c\uc131\uc774 \ud544\uc694\ud558\ubbc0\ub85c \uc704 \uc608\uc81c\uc758 \ud3ec\ud2b8\ub9cc 465\ub85c \ubc14\uafb8\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/p>\n
    \uc778\uc99d \uc815\ubcf4 \ud30c\uc77c\uc740 \uc178 \uba85\ub839\uc5d0 \ube44\ubc00\ubc88\ud638\ub97c \uc9c1\uc811 \ubd99\uc774\uc9c0 \ub9d0\uace0 \ud3b8\uc9d1\uae30\ub85c \uc791\uc131\ud569\ub2c8\ub2e4.<\/p>\n
    sudo install -m 600 \/dev\/null \/etc\/postfix\/sasl_passwd\nsudo vi \/etc\/postfix\/sasl_passwd<\/code><\/pre>\n
    \uc704 install \uba85\ub839\uc740 \uc2e0\uaddc \ud30c\uc77c \uc0dd\uc131\uc6a9\uc785\ub2c8\ub2e4.<\/strong> \uae30\uc874 sasl_passwd \ud30c\uc77c\uc774 \uc788\uc73c\uba74 \ub0b4\uc6a9\uc744 \uc9c0\uc6b0\ubbc0\ub85c \uc2e4\ud589\ud558\uc9c0 \ub9d0\uace0 \uae30\uc874 \ud30c\uc77c\uc744 \ud3b8\uc9d1\ud569\ub2c8\ub2e4. \ud30c\uc77c \ub0b4\uc6a9\uc740 \ub2e4\uc74c \ud615\uc2dd\uc785\ub2c8\ub2e4.<\/p>\n
    [smtp.provider.example]:587 SMTP_USERNAME:SMTP_PASSWORD<\/code><\/pre>\n
    \uc11c\ubc84\uba85\u00b7\ub300\uad04\ud638\u00b7\ud3ec\ud2b8\ub294 relayhost\uc640 \uc77c\uce58\ud574\uc57c \ud569\ub2c8\ub2e4. \uc2e4\uc81c \uc790\uaca9 \uc99d\uba85\uc744 \ubb38\uc11c\u00b7\uc2a4\ud06c\ub9b0\uc0f7\u00b7\uacf5\uc720 \ub85c\uadf8\uc5d0 \ub123\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. hash \ub9f5 \uc9c0\uc6d0 \uc5ec\ubd80\ub97c \ud655\uc778\ud55c \ub4a4 \ub370\uc774\ud130\ubca0\uc774\uc2a4 \ud30c\uc77c\uc744 \uc0dd\uc131\ud569\ub2c8\ub2e4.<\/p>\n
    postconf -m\nsudo postmap \/etc\/postfix\/sasl_passwd\nsudo chmod 600 \/etc\/postfix\/sasl_passwd \/etc\/postfix\/sasl_passwd.db\nsudo postfix check\nsudo postfix reload<\/code><\/pre>\n
    postconf -m \ucd9c\ub825\uc5d0 hash\uac00 \uc5c6\ub294 \ud658\uacbd\uc740 \uc9c0\uc6d0\ud558\ub294 \ub9f5 \uc720\ud615\uacfc \ud30c\uc77c \uc0dd\uc131 \ubc29\uc2dd\uc744 \ud655\uc778\ud574\uc57c \ud569\ub2c8\ub2e4. \ube44\ubc00\ubc88\ud638\ub97c \ubc14\uafb8\uba74 postmap\ub3c4 \ub2e4\uc2dc \uc2e4\ud589\ud569\ub2c8\ub2e4. \uc678\ubd80 \uc81c\uacf5\uc790\uac00 \ud5c8\uc6a9\ud55c \ubc1c\uc2e0 \uc8fc\uc18c\u00b7\ub3c4\uba54\uc778\uc73c\ub85c\ub9cc \ubc1c\uc1a1\ud558\uc138\uc694.<\/p>\n
    5. \uc218\uc2e0\uc6a9 25\ubc88\uacfc \uc0ac\uc6a9\uc790 \uc81c\ucd9c\uc6a9 587\ubc88<\/h2>\n
    \ud3ec\ud2b8<\/th>\uc6a9\ub3c4<\/th>\ud2b9\uc9d5<\/th><\/tr><\/thead>
    25<\/td>\uc11c\ubc84 \uac04 SMTP \uc804\ub2ec<\/td>\uacf5\uac1c \uc218\uc2e0\uc5d0\ub294 MX, \uc218\uc2e0\uc790 \uad00\ub9ac\uc640 \ub9b4\ub808\uc774 \uc81c\ud55c\uc774 \ud544\uc694<\/td><\/tr>
    587<\/td>\uc0ac\uc6a9\uc790\uc758 \uba54\uc77c \uc81c\ucd9c<\/td>\uc77c\ubc18\uc801\uc73c\ub85c STARTTLS\uc640 SASL \uc778\uc99d\uc744 \uc694\uad6c<\/td><\/tr>
    465<\/td>\uc554\uc2dc\uc801 TLS \uba54\uc77c \uc81c\ucd9c<\/td>\uc811\uc18d \uc2dc\uc791\ubd80\ud130 TLS \uc0ac\uc6a9<\/td><\/tr>
    993<\/td>IMAPS \uba54\uc77c\ud568 \uc870\ud68c<\/td>Postfix\uc640 \ubcc4\ub3c4 IMAP \uc11c\ube44\uc2a4 \ub2f4\ub2f9<\/td><\/tr><\/tbody><\/table>\n
    smtp_\ub85c \uc2dc\uc791\ud558\ub294 \uc124\uc815\uc740 Postfix\uac00 \ub2e4\ub978 \uc11c\ubc84\ub85c \ubcf4\ub0bc \ub54c\uc758 \ud074\ub77c\uc774\uc5b8\ud2b8 \ub3d9\uc791\uc774\uace0, smtpd_ \uc124\uc815\uc740 \ub2e4\ub978 \ud074\ub77c\uc774\uc5b8\ud2b8\uac00 \uc774 \uc11c\ubc84\ub85c \uc811\uc18d\ud560 \ub54c\uc758 \ub3d9\uc791\uc785\ub2c8\ub2e4. smtp_sasl_auth_enable\uc744 \ucf1c\ub3c4 \uc774 \uc11c\ubc84\uc5d0 \ub85c\uadf8\uc778\ud558\ub294 587 \uc11c\ube44\uc2a4\uac00 \uc790\ub3d9 \uc0dd\uc131\ub418\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/p>\n
    587 \uc11c\ube44\uc2a4\ub294 master.cf\uc5d0\uc11c \ud65c\uc131\ud654\ud558\uace0, \uc720\ud6a8\ud55c \uc11c\ubc84 \uc778\uc99d\uc11c\uc640 SASL \uc778\uc99d \ubc31\uc5d4\ub4dc(Dovecot \ub4f1)\ub97c \uc5f0\uacb0\ud574\uc57c \ud569\ub2c8\ub2e4. \uc554\ud638\ud654 \uc804 \uc778\uc99d \uae08\uc9c0, \uc778\uc99d \uc0ac\uc6a9\uc790\ub9cc \ub9b4\ub808\uc774 \ud5c8\uc6a9, \uc2e4\uc81c \uc778\uc99d \uc18c\ucf13 \uacbd\ub85c\uc640 \uad8c\ud55c\uc744 \ud568\uaed8 \uac80\uc99d\ud569\ub2c8\ub2e4. \uc124\uce58 \uc608\uc81c\uc758 snakeoil \uc778\uc99d\uc11c\ub294 \uacf5\uc778 \uc6b4\uc601 \uc778\uc99d\uc11c\ub97c \ub300\uc2e0\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/p>\n
    \uc778\ud130\ub137 \uc218\uc2e0\uc744 \uc5f4 \ub54c\ub294 inet_interfaces, \ubc29\ud654\ubcbd 25\ubc88, MX\uc640 \ub85c\uceec\/\uac00\uc0c1 \uc218\uc2e0\uc790 \uad6c\uc131\uc744 \ud568\uaed8 \ubcc0\uacbd\ud569\ub2c8\ub2e4. \uc11c\ubc84 \uac04 SMTP\uc758 TLS\ub294 \uc0c1\ud638\uc6b4\uc6a9\uc131\uc744 \uace0\ub824\ud574\uc57c \ud558\uba70, \uc0ac\uc6a9\uc790\uc758 587 \uc81c\ucd9c \uc815\ucc45\uc744 25\ubc88\uc5d0 \ubb34\uc870\uac74 \uc801\uc6a9\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/p>\n
    6. DNS\uc640 \ubc1c\uc1a1 \uc2e0\ub8b0\ub3c4<\/h2>\n
    \ud56d\ubaa9<\/th>\ud655\uc778 \ub0b4\uc6a9<\/th><\/tr><\/thead>
    A \/ AAAA<\/td>\uba54\uc77c \ud638\uc2a4\ud2b8\uc758 \uc2e4\uc81c IPv4 \/ IPv6 \uc8fc\uc18c<\/td><\/tr>
    MX<\/td>\ud574\ub2f9 \ub3c4\uba54\uc778\uc758 \uc218\uc2e0 \ub2f4\ub2f9 \uc11c\ubc84. \ubc1c\uc1a1\ub9cc \ud558\ub294 \ubaa8\ub4e0 \uc11c\ubc84\uc5d0 \uc790\uccb4 MX\uac00 \ud544\uc694\ud55c \uac83\uc740 \uc544\ub2d8<\/td><\/tr>
    PTR<\/td>\uc1a1\uc2e0 IP\uc758 \uc5ed\ubc29\ud5a5 \uc774\ub984. IP \uc81c\uacf5\uc790\uc5d0 \uc124\uc815 \uc694\uccad<\/td><\/tr>
    SPF<\/td>\ud574\ub2f9 \ubc1c\uc2e0 \ub3c4\uba54\uc778\uc744 \ub300\uc2e0\ud574 \ubcf4\ub0bc \uc218 \uc788\ub294 \uc11c\ubc84\u00b7\uc81c\uacf5\uc790 \uc120\uc5b8<\/td><\/tr>
    DKIM<\/td>\ubc1c\uc1a1 \uc2dc \uc11c\uba85\ud558\uace0 DNS \uacf5\uac1c \ud0a4\ub85c \uac80\uc99d. \ubcc4\ub3c4 \uc11c\uba85 \uc11c\ube44\uc2a4 \ub610\ub294 \uc81c\uacf5\uc790 \uc124\uc815 \ud544\uc694<\/td><\/tr>
    DMARC<\/td>\ud45c\uc2dc\ub41c From \ub3c4\uba54\uc778\uacfc SPF\/DKIM \uc815\ub82c\uc744 \ubc14\ud0d5\uc73c\ub85c \uc815\ucc45\u00b7\ubcf4\uace0 \uc124\uc815<\/td><\/tr><\/tbody><\/table>\n
    DNS \uc778\uc99d \ud1b5\uacfc\uac00 \ubc1b\uc740\ud3b8\uc9c0\ud568 \ub3c4\ucc29\uc744 \ubcf4\uc7a5\ud558\uc9c0\ub294 \uc54a\uc2b5\ub2c8\ub2e4. IP \ud3c9\ud310, \ub0b4\uc6a9, \uc218\uc2e0 \ub3d9\uc758, \ubc18\uc1a1\ub960\uacfc \ubc1c\uc1a1\ub7c9\ub3c4 \uc601\ud5a5\uc744 \uc90d\ub2c8\ub2e4. SPF\ub97c \uc5ec\ub7ec TXT \ub808\ucf54\ub4dc\ub85c \uc911\ubcf5 \uc0dd\uc131\ud558\uac70\ub098 \uc2e4\uc81c \uc0ac\uc6a9\ud558\uc9c0 \uc54a\ub294 \ubc1c\uc1a1 \uc11c\ubc84\ub97c \ucd94\uac00\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/p>\n
    7. \ubc1c\uc1a1 \uc2dc\ud5d8\uacfc \ub85c\uadf8 \ud655\uc778<\/h2>\n
    \ub2e4\uc74c\uc740 \uc11c\ubc84 \uad00\ub9ac\uc790\uac00 \uc9c1\uc811 \uc18c\uc720\ud55c \ud14c\uc2a4\ud2b8 \uc218\uc2e0 \uc8fc\uc18c<\/strong>\ub85c \uc2e4\ud589\ud558\ub294 \uc608\uc2dc\uc785\ub2c8\ub2e4. \ubc1c\uc2e0 \uc8fc\uc18c\ub3c4 \ud5c8\uc6a9\ub41c \uc8fc\uc18c\ub85c \ubc14\uafc9\ub2c8\ub2e4.<\/p>\n
    printf 'From: sender@example.com\\nTo: your-test-address@example.net\\nSubject: Postfix test\\n\\nTest message.\\n' | \/usr\/sbin\/sendmail -f sender@example.com -v your-test-address@example.net\n\npostqueue -p\nsudo journalctl --since \"10 minutes ago\" | grep postfix\nsudo tail -n 100 \/var\/log\/mail.log<\/code><\/pre>\n
    mail.log\ub294 rsyslog \uad6c\uc131\uc5d0 \ub530\ub77c \uc5c6\uc744 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uac19\uc740 queue ID\ub85c \uc811\uc218\ubd80\ud130 \ub2e4\uc74c \uc11c\ubc84 \uc751\ub2f5\uae4c\uc9c0 \ucd94\uc801\ud569\ub2c8\ub2e4. status=sent\ub294 \ub2e4\uc74c \uc11c\ubc84\uac00 \uc218\ub77d\ud588\ub2e4\ub294 \uc758\ubbf8\uc774\uba70 \ucd5c\uc885 \ubc1b\uc740\ud3b8\uc9c0\ud568 \ub3c4\ucc29\uc744 \ub73b\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. deferred\ub294 \uc77c\uc2dc \uc2e4\ud328\ub85c \uc7ac\uc2dc\ub3c4 \ub300\uae30, bounced\ub294 \ubc18\uc1a1 \ucc98\ub9ac\uc785\ub2c8\ub2e4.<\/p>\n
    \uc624\ub958\u00b7\uc99d\uc0c1<\/th>\uc810\uac80 \ubc29\ud5a5<\/th><\/tr><\/thead>
    Relay access denied<\/td>\uc5b4\ub290 \uc11c\ubc84\uac00 \uac70\ubd80\ud588\ub294\uc9c0 \ud655\uc778. \ub85c\uceec \uc2e0\ub8b0 IP\u00b7\uc778\uc99d \uc0c1\ud0dc \ub610\ub294 \uc678\ubd80 \uc81c\uacf5\uc790\uc758 \ub9b4\ub808\uc774 \uc815\ucc45 \ud655\uc778<\/td><\/tr>
    SASL authentication failed<\/td>\uc790\uaca9 \uc99d\uba85, \uc571 \ube44\ubc00\ubc88\ud638 \uc694\uad6c, \ub9f5 \ud0a4\uc758 \ud3ec\ud2b8, postmap \uc7ac\uc0dd\uc131 \ud655\uc778<\/td><\/tr>
    Connection timed out<\/td>\uc1a1\uc2e0 \ud3ec\ud2b8 \ucc28\ub2e8, \ubc29\ud654\ubcbd, DNS, IPv6 \uacbd\ub85c \ud655\uc778<\/td><\/tr>
    Certificate verification failed<\/td>\uc811\uc18d \uc774\ub984\u00b7\uc778\uc99d\uc11c \uc774\ub984\u00b7\uc720\ud6a8\uae30\uac04\u00b7CA \uccb4\uc778\u00b7\uc11c\ubc84 \uc2dc\uac04 \ud655\uc778<\/td><\/tr>
    User unknown in local recipient table<\/td>mydestination \uc624\uc124\uc815 \ub610\ub294 \uc2e4\uc81c \ub85c\uceec \uc218\uc2e0\uc790 \ub204\ub77d \ud655\uc778<\/td><\/tr>
    \uba54\uc77c\uc774 \uc2a4\ud338\ud568\uc73c\ub85c \uc774\ub3d9<\/td>\uc218\uc2e0 \ud5e4\ub354\uc758 \uc778\uc99d \uacb0\uacfc, IP \ud3c9\ud310, \ubc1c\uc2e0 \ub0b4\uc6a9\u00b7\ub3c4\uba54\uc778 \uc815\ub82c \ud655\uc778<\/td><\/tr><\/tbody><\/table>\n
    \uc6d0\uc778\uc744 \ud574\uacb0\ud55c \ud6c4 \ud544\uc694\ud55c \uacbd\uc6b0 postqueue -f\ub85c \ub300\uae30 \ud050 \uc7ac\uc2dc\ub3c4\ub97c \uc694\uccad\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uac19\uc740 \uc624\ub958\uac00 \uacc4\uc18d\ub418\ub294 \uc0c1\ud0dc\uc5d0\uc11c \ubc18\ubcf5 \uc2e4\ud589\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \ub300\uae30 \uba54\uc77c\uc744 \ubaa8\ub450 \uc0ad\uc81c\ud558\ub294 \uba85\ub839\uc740 \uc9c4\ub2e8 \ub2e8\uacc4\uc5d0\uc11c \uc0ac\uc6a9\ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.<\/p>\n
    \uc6b4\uc601 \uc804 \ud655\uc778 \uc0ac\ud56d<\/h2>