{"id":888,"date":"2018-06-25T18:26:43","date_gmt":"2018-06-26T03:26:43","guid":{"rendered":"\/blog\/?p=888"},"modified":"2023-09-21T09:37:33","modified_gmt":"2023-09-21T00:37:33","slug":"%ea%b0%80-centos-7-%eb%b2%84%ec%a0%84%ec%97%90-smtp-%ec%84%9c%eb%b2%84-%ec%84%a4%ec%b9%98%ed%95%98%ea%b8%b0","status":"publish","type":"post","link":"https:\/\/hasu0707.duckdns.org\/blog\/?p=888","title":{"rendered":"?\uac00 CentOS 7 \ubc84\uc804\uc5d0 SMTP \uc11c\ubc84 \uc124\uce58\ud558\uae30"},"content":{"rendered":"

\ucd9c\ucc98: https:\/\/hooni.net\/87009<\/span><\/p>\n


<\/p>\n

[Postfix]<\/span><\/p>\n

\ub9ac\ub205\uc2a4 \uacc4\uc5f4\uc774\ub098 \ubc84\uc804\uc5d0 \ub530\ub77c \uae30\ubcf8\uc73c\ub85c \uc0ac\uc6a9\ud558\ub294 MTA(Mail Transfer Agent)\uac00 \ub2e4\ub97c \uc218 \uc788\ub2e4.<\/span><\/p>\n

CentOS(\ub808\ub4dc\ud587 \uacc4\uc5f4)\uc5d0\uc11c\ub294 Sendmail\uc774 \uae30\ubcf8 MTA\ub85c \uc124\uc815\ub418\uc5b4 \uc788\uace0 \uc6b0\ubd84\ud22c\uc5d0\uc11c\ub294 Postfix\ub97c \uae30\ubcf8 MTA\ub85c \uc124\uc815\ub418\uc5b4 \uc788\ub2e4. <\/span>\uac1c\uc778\uc801\uc73c\ub85c Sendmail \ubcf4\ub2e4\ub294 Postfix\ub294 \ube60\ub974\uace0 \uad00\ub9ac\uc640 \ubcf4\uc548\uc774 \uc218\uc6d4\ud558\ub2e4. \uadf8\ub9ac\uace0 Sendmail\uacfc \ud638\ud658\uc774 \ub41c\ub2e4.<\/span><\/p>\n


<\/p>\n

\uc124\uce58\uc5d0 \uc55e\uc11c \uba54\uc77c\uc11c\ubc84\uc5d0\uc11c \uc0ac\uc6a9\ud558\ub294 \uae30\ubcf8\uc801\uc778 \ud3ec\ud2b8 \ubc88\ud638\ub97c \uc54c\uc544\ub450\uace0 \uc124\uce58 \ud6c4 \ubc29\ud654\ubcbd\uc5d0 \uc801\uc6a9\ud558\uc790.<\/span><\/p>\n

smtp(25), smtps(465), pop3(110), pop3s(995), submission(587, pop3 \ub300\uccb4 \ud3ec\ud2b8)<\/span><\/p>\n


<\/p>\n


<\/p>\n


<\/p>\n

1. yum \uc744 \uc774\uc6a9\ud574 postfix \uc124\uce58<\/span><\/p>\n

[root@hooni ~] yum -y <\/span>update<\/span>\n<\/span><\/code>[root@hooni ~] yum -y <\/span>install<\/span> postfix<\/span><\/pre>\n\n\n\n

<\/p>\n

<\/p>\n

<\/p>\n
2. hosts \ud30c\uc77c \uc124\uc815<\/span><\/p>\n
[root@hooni ~]# <\/span>vi<\/span> \/etc\/hosts<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4\n::1       localhost localhost.localdomain localhost6 localhost6.localdomain6\n121.78.119.99 mail.hooni.net<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n

<\/p>\n

<\/p>\n
3. SSL \uc778\uc99d\uc11c \uc0dd\uc131<\/span><\/p>\n
\uc77c\ubc18\uc801\uc73c\ub85c SSL \uc778\uc99d\uc11c\ub294 \uacf5\uc778\ub41c \uc778\uc99d\uae30\uad00(CA)\uc5d0\uc11c \uc720\ub8cc\ub85c \ubc1c\uae09\ud558\uc9c0\ub9cc Let's Encrypt\ub77c\ub294 \ube44\uc601\ub9ac \ubb34\ub8cc \uac1c\ubc29\ud615 \uc774\uc99d \uae30\uad00(CA)\uc5d0\uc11c \ubb34\ub8cc\ub85c \ubc1c\uae09 \ubc1b\uc744 \uc218 \uc788\ub2e4.<\/span><\/p>\n

<\/p>\n
Let's Encrypt \uc778\uc99d\uc11c \ubc1c\uae09\ud558\ub294 \ubc29\ubc95\uc740 \uc774\ubc88 \uc8fc\uc81c\uc640 \ubb34\uad00\ud558\ubbc0\ub85c \uad00\ub828 \ub9c1\ud06c\ub97c \ucca8\ubd80\ud568<\/span><\/p>\n
[\ucc38\uace0]<\/span> <\/span>\ubb34\ub8cc\ub85c HTTPS \uc801\uc6a9\ud558\uae30 (Let's Encrypt)<\/span><\/a><\/span><\/p>\n

<\/p>\n
\uc5ec\uae30\uc11c\ub294 openssl \uba85\ub839\uc5b4\ub97c \uc774\uc6a9\ud574 \ub85c\uceec\uc5d0\uc11c \uc9c1\uc811 \uc0dd\uc131\ud574\uc11c \uc774\uc6a9\ud558\ub294 \ubc29\ubc95\uc73c\ub85c \uc124\uba85\ud558\uaca0\ub2e4.<\/span>
<\/p>\n

<\/p>\n
SSL \uad00\ub828 \ud30c\uc77c\uc744 \uc800\uc7a5\ud560 \ub514\ub809\ud1a0\ub9ac \uc0dd\uc131<\/span>
<\/p>\n
[root@hooni ~]# <\/span>mkdir<\/span> \/etc\/postfix\/ssl\n[root@hooni ~]# <\/span>cd<\/span> \/etc\/postfix\/ssl<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n
openssl \uc774 \uc124\uce58\ub418\uc5b4 \uc788\uc9c0 \uc54a\ub294 \uacbd\uc6b0 yum\uc744 \uc774\uc6a9\ud574 \uc124\uce58<\/span><\/p>\n
[root@hooni ssl]# yum -y <\/span>install<\/span> openssl<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n
openssl \uba85\ub839\uc744 \ud1b5\ud574 \uac1c\uc778\ud0a4\uc640 \uc778\uc99d\uc11c \uc0dd\uc131<\/span><\/p>\n
[root@hooni ssl]# openssl req -x509 -nodes -newkey rsa:2048 -keyout server.key -out server.crt -nodes -days 365<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n
\ub2e4\uc74c \uc608\uc640 \uac19\uc774 \uac1c\uc778\ud0a4\uc5d0 \ub300\ud55c \uc815\ubcf4\ub97c \uc785\ub825\ud558\uace0 \uc0dd\uc131<\/span><\/p>\n
Generating a 2048 bit RSA private key\n<\/span>..<\/span>..<\/span>..<\/span>..<\/span>..<\/span>..<\/span>..<\/span>..<\/span>..<\/span>..<\/span>..<\/span>..<\/span>..<\/span>+++\n<\/span>..<\/span>..<\/span>..<\/span>..<\/span>..<\/span>..<\/span>..<\/span>..<\/span>..<\/span>..<\/span>..<\/span>..<\/span>..<\/span>.+++\nwriting new private key to <\/span>'server.key'<\/span>\n-----\nYou are about to be asked to enter information that will be incorporated\ninto your certificate request.\nWhat you are about to enter is what is called a Distinguished Name or a DN.\nThere are quite a few fields but you can leave some blank\nFor some fields there will be a default value,\nIf you enter <\/span>'.'<\/span>, the field will be left blank.\n-----\nCountry Name <\/span>(<\/span>2 letter code<\/span>)<\/span> <\/span>[<\/span>XX<\/span>]<\/span>:US\nState or Province Name <\/span>(<\/span>full name<\/span>)<\/span> <\/span>[<\/span>]<\/span>:CA\nLocality Name <\/span>(<\/span>eg, city<\/span>)<\/span> <\/span>[<\/span>Default City<\/span>]<\/span>:Irvine\nOrganization Name <\/span>(<\/span>eg, company<\/span>)<\/span> <\/span>[<\/span>Default Company Ltd<\/span>]<\/span>:Hooni.net\nOrganizational Unit Name <\/span>(<\/span>eg, section<\/span>)<\/span> <\/span>[<\/span>]<\/span>:S\/W Develop\nCommon Name <\/span>(<\/span>eg, your name or your server's hostname<\/span>)<\/span> <\/span>[<\/span>]<\/span>:mail.hooni.net\nEmail Address <\/span>[<\/span>]<\/span>:me@hooni<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n

<\/p>\n

<\/p>\n
4. Postfix \uc124\uc815\ud30c\uc77c \uc218\uc815 (\/etc\/postfix\/main.cf)<\/span><\/p>\n
[root@hooni ~]# <\/span>vi<\/span> \/etc\/postfix\/main.cf<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n
myhostname = mail.hooni.net\nmydomain = hooni.net\nmyorigin = <\/span>$mydomain<\/span>\nhome_mailbox = mail\/\nmynetworks = 127.0.0.0\/8\ninet_interfaces = all\ninet_protocols = all\ninet_interfaces = localhost\nmydestination = <\/span>$myhostname<\/span>, localhost.<\/span>$mydomain<\/span>, localhost, <\/span>$mydomain<\/span>\nsmtpd_sasl_type = dovecot\nsmtpd_sasl_path = private\/auth\nsmtpd_sasl_local_domain =\nsmtpd_sasl_security_options = noanonymous\nbroken_sasl_auth_clients = <\/span>yes<\/span>\nsmtpd_sasl_auth_enable = <\/span>yes<\/span>\nsmtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination\nsmtp_tls_security_level = may\nsmtpd_tls_security_level = may\nsmtp_tls_note_starttls_offer = <\/span>yes<\/span>\nsmtpd_tls_loglevel = 1\nsmtpd_tls_key_file = \/etc\/postfix\/ssl\/server.key\nsmtpd_tls_cert_file = \/etc\/postfix\/ssl\/server.crt\nsmtpd_tls_received_header = <\/span>yes<\/span>\nsmtpd_tls_session_cache_timeout = 3600s\ntls_random_source = dev:\/dev\/urandom<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n

<\/p>\n

<\/p>\n
5. Postfix \uc124\uc815\ud30c\uc77c \uc218\uc815 (\/etc\/postfix\/master.cf)<\/span><\/p>\n
[root@hooni ~]# <\/span>nano<\/span>  \/etc\/postfix\/master.cf<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n
# service type  private unpriv  chroot  wakeup  maxproc command + args<\/span>\n<\/span>#               (yes)   (yes)   (yes)   (never) (100)<\/span>\n<\/span># ==========================================================================<\/span>\nsmtp      inet  n       -       n       -       -       smtpd<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n
 \ub2e4\uc74c\uacfc \uac19\uc774 \ud574\ub2f9 \uc601\uc5ed\uc758 \uc8fc\uc11d\uc744 \uc81c\uac70\ud55c\ub2e4.<\/span><\/p>\n
submission     inet  n       -       n       -       -       smtpd\n  -o syslog_name=postfix\/submission\n  -o smtpd_sasl_auth_enable=yes\n  -o smtpd_recipient_restrictions=permit_sasl_authenticated,reject\n  -o milter_macro_daemon_name=ORIGINATING\nsmtps     inet  n       -       n       -       -       smtpd\n  -o syslog_name=postfix\/smtps\n  -o smtpd_sasl_auth_enable=yes\n  -o smtpd_recipient_restrictions=permit_sasl_authenticated,reject\n  -o milter_macro_daemon_name=ORIGINATING<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n

<\/p>\n

<\/p>\n
6. Dovecot \uc124\uce58<\/span><\/p>\n
[root@hooni ~]# yum -y <\/span>install<\/span> dovecot<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n

<\/p>\n

<\/p>\n
7. Dovecot \uc124\uc815\ud30c\uc77c \uc218\uc815 (\/etc\/dovecot\/conf.d\/10-master.cf)<\/span><\/p>\n
[root@hooni ~]# <\/span>vi<\/span> \/etc\/dovecot\/conf.d\/10-master.conf<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n
\ub2e4\uc74c\uacfc \uac19\uc774 \ud574\ub2f9 \uc601\uc5ed\uc758 \uc8fc\uc11d\uc744 \uc81c\uac70\ud55c\ub2e4.<\/span><\/p>\n
# Postfix smtp-auth<\/span>\nunix_listener \/var\/spool\/postfix\/private\/auth <\/span>{<\/span>\nmode = 0660\nuser = postfix\ngroup = postfix\n<\/span>}<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n

<\/p>\n

<\/p>\n
8. Dovecot \uc124\uc815\ud30c\uc77c \uc218\uc815 (\/etc\/dovecot\/conf.d\/10-auth.cf)<\/span>
<\/p>\n
   <\/span>nano<\/span> \/etc\/dovecot\/conf.d\/10-auth.conf<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n
\ub2e4\uc74c\uacfc \uac19\uc774 'login' \ud0a4\uc6cc\ub4dc\ub97c \ucd94\uac00\ud55c\ub2e4.<\/span>
<\/p>\n
# Space separated list of wanted authentication mechanisms:<\/span>\n<\/span>#   plain login digest-md5 cram-md5 ntlm rpa apop anonymous gssapi otp skey<\/span>\n<\/span>#   gss-spnego<\/span>\n<\/span># NOTE: See also disable_plaintext_auth setting.<\/span>\nauth_mechanisms = plain<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n

<\/p>\n

<\/p>\n
9. Dovecot \uc124\uc815\ud30c\uc77c \uc218\uc815 (\/etc\/dovecot\/conf.d\/10-mail.cf)<\/span><\/p>\n

<\/p>\n
\ub2e4\uc74c\uacfc \uac19\uc774 \ud574\ub2f9 \uc601\uc5ed\uc758 \uc8fc\uc11d\uc744 \uc81c\uac70\ud558\uace0 maildir\uc744 \uc124\uc815.<\/span><\/p>\n
mail_location = maildir:~\/mail<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n

<\/p>\n

<\/p>\n
10. Dovecot \uc124\uc815\ud30c\uc77c \uc218\uc815 (\/etc\/dovecot\/conf.d\/20-pop3.cf)<\/span><\/p>\n
[root@hooni ~]# <\/span>vi<\/span> \/etc\/dovecot\/conf.d\/20-pop3.conf<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n
\ub2e4\uc74c\uacfc \uac19\uc774 \ud574\ub2f9 \ub0b4\uc6a9\uc758 \uc8fc\uc11d\uc744 \uc81c\uac70\ud55c\ub2e4.<\/span><\/p>\n
# Note that Outlook 2003 seems to have problems with %v.%u format which was<\/span>\n<\/span># Dovecot's default, so if you're building a new server it would be a good<\/span>\n<\/span># idea to change this. %08Xu%08Xv should be pretty fail-safe.<\/span>\n<\/span>#<\/span>\npop3_uidl_format <\/span>=<\/span> %08Xu%08Xv<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n

<\/p>\n

<\/p>\n
11. Postfix\uc640 Devecot \uc2e4\ud589 \ubc0f \uc11c\ube44\uc2a4 \ub4f1\ub85d<\/span><\/p>\n
\uc124\uc815\ud30c\uc77c\uc774  \ubc18\uc601\ub418\ub3c4\ub85d Postfix\uc640 Devecot\ub97c \uc7ac\uc2dc\uc791 \ud558\uace0 \uc2dc\uc2a4\ud15c\uc774 \uc7ac\ubd80\ud305\ub418\uba74 \uc790\ub3d9\uc73c\ub85c \uc2e4\ud589\ub418\ub3c4\ub85d \uc11c\ube44\uc2a4\uc5d0 \ub4f1\ub85d\ud55c\ub2e4.<\/span><\/p>\n
[root@hooni ~]# systemctl restart postfix\n[root@hooni ~]# systemctl <\/span>enable<\/span> postfix\n[root@hooni ~]# systemctl restart dovecot\n[root@hooni ~]# systemctl <\/span>enable<\/span> dovecot<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n

<\/p>\n

<\/p>\n
12. \ubc29\ud654\ubcbd\uc5d0 \uc11c\ube44\uc2a4 \uad00\ub828 \ud3ec\ud2b8\ub97c \uc801\uc6a9<\/span><\/p>\n
[root@hooni ~]# firewall-cmd --permanent --add-service<\/span>=<\/span>smtp\n[root@hooni ~]# firewall-cmd --permanent --add-port<\/span>=<\/span>587\/tcp\n[root@hooni ~]# firewall-cmd --permanent --add-port<\/span>=<\/span>465\/tcp\n[root@hooni ~]# firewall-cmd --permanent --add-port<\/span>=<\/span>110\/tcp\n[root@hooni ~]# firewall-cmd --permanent --add-service<\/span>=<\/span>pop3s\n[root@hooni ~]# firewall-cmd --permanent --add-port<\/span>=<\/span>143\/tcp\n[root@hooni ~]# firewall-cmd --permanent --add-service<\/span>=<\/span>imaps\n[root@hooni ~]# firewall-cmd --permanent --add-service<\/span>=<\/span>http\n[root@hooni ~]# firewall-cmd --reload<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n

<\/p>\n

<\/p>\n
13. \uc11c\ube44\uc2a4 \ud655\uc778\ud558\uae30<\/span>
<\/p>\n
\ud154\ub137 \uba85\ub839\uc5b4(telnet)\ub97c \ud1b5\ud574 \uac01 \uc11c\ube44\uc2a4\uc758 \ud574\ub2f9 \ud3ec\ud2b8\ub85c \uc811\uc18d\ud574\uc11c \uc798 \uc791\ud558\ub294\uc9c0 \ud655\uc778\ud560 \uc218 \uc788\ub2e4.<\/span><\/p>\n

<\/p>\n
telnet \ud074\ub77c\uc774\uc5b8\ud2b8\uac00 \uc5c6\ub2e4\uba74 \uc124\uce58\ud55c\ub2e4.<\/span><\/p>\n
[root@hooni ~]# yum -y <\/span>install<\/span> telnet<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n
telnet \uba85\ub839\uc73c\ub85c smtp \uc11c\ube44\uc2a4\uc5d0 \uc811\uc18d\ud55c\ub2e4.<\/span><\/p>\n
[root@hooni ~]# telnet mail.hooni.net smtp<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n
\uc811\uc18d \ud6c4 ehlo mail.hooni.net \uba85\ub839 \uc2e4\ud589 \ud6c4 \ub2e4\uc74c\uacfc \uac19\uc774 \ucd9c\ub825\ub418\uba74 \uc798 \ub3d9\uc791\ud558\ub294 \uac83\uc774\ub2e4.<\/span><\/p>\n
Trying 121.78.119.99<\/span>..<\/span>.\nConnected to localhost.\nEscape character is <\/span>'^]'<\/span>.<\/span>\n220 mail.hooni.net ESMTP Postfix\n<\/span>ehlo<\/span> <\/span><\/code>mail.hooni.net\n250-mail.hooni.net\n250-PIPELINING\n250-SIZE 10240000\n250-VRFY\n250-ETRN\n250-STARTTLS\n250-AUTH PLAIN LOGIN\n250-AUTH=PLAIN LOGIN\n250-ENHANCEDSTATUSCODES\n250-8BITMIME\n250 DSN<\/span><\/pre>\n\n\n\n

<\/p>\n
\ub2e4\uc74c\uacfc \uac19\uc740 \uba85\ub839\uc744 \uc0ac\uc6a9\ud558\uc5ec \ucf58\uc194\uc5d0\uc11c \uba54\uc77c\uc744 \ubc1c\uc1a1\ud560 \uc218 \uc788\ub2e4.<\/span>
<\/p>\n
mail from:hooni@test.com<\/span><\/code><\/pre>\n\n\n\n
mail from:<\/span>hooni@test.com\n<\/span><\/code>250 2.1.0 Ok\n<\/span><\/font>rcpt to:<\/span>picomax@test.com\n<\/span>250 2.1.5 Ok\n<\/span><\/font>data\n<\/span><\/font><\/span>354 End data with <CR><LF>.<CR><LF>\nThis is a kind of test email.\nIt would be finished when you put a period at the end of the document.\n.\n250 2.0.0 Ok: queued as 655A4C1C08<\/span><\/font><\/pre>\n\n\n\n

<\/p>\n

<\/p>\n

<\/p>\n
telnet \uba85\ub839\uc73c\ub85c pop3 \uc11c\ube44\uc2a4\uc5d0 \uc811\uc18d\ud55c\ub2e4.<\/span>
<\/p>\n
[root@hooni ~]# telnet mail.hooni.net pop3<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n
\ub2e4\uc74c\uacfc \uac19\uc740 \ub0b4\uc6a9\uc774 \ucd9c\ub825\ub418\uba74 \uc815\uc0c1\uc801\uc73c\ub85c \ub3d9\uc791\ud558\ub294 \uac83\uc774\ub2e4.<\/span><\/p>\n
Trying 121.78.119.99<\/span>..<\/span>.\nConnected to mail.hooni.net.\nEscape character is <\/span>'^]'<\/span>.<\/span>\n+OK Dovecot ready.<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n
\ub4f1\ub85d\ub41c \uc0ac\uc6a9\uc790 \uacc4\uc815\uc73c\ub85c \ub85c\uadf8\uc778\uc744 \uc2dc\ub3c4\ud574\ubcf4\uc790.<\/span><\/p>\n
user picomax\n+OK\npass Password\n+OK Logged in.\nretr\n-ERR There's no message 1.\nquit\n+OK Logging out.\nConnection closed by foreign host.<\/span><\/code><\/pre>\n\n\n\n

<\/p>\n

<\/p>\n
<\/span><\/p>","protected":false},"excerpt":{"rendered":"
\ucd9c\ucc98: https:\/\/hooni.net\/87009 [Postfix] \ub9ac\ub205\uc2a4 \uacc4\uc5f4\uc774\ub098 \ubc84\uc804\uc5d0 \ub530\ub77c \uae30\ubcf8\uc73c\ub85c \uc0ac\uc6a9\ud558\ub294 MTA(Mail Transfer Agent)\uac00 \ub2e4\ub97c \uc218 \uc788\ub2e4. CentOS(\ub808\ub4dc\ud587 \uacc4\uc5f4)\uc5d0\uc11c\ub294 Sendmail\uc774 \uae30\ubcf8 MTA\ub85c \uc124\uc815\ub418\uc5b4 \uc788\uace0 \uc6b0\ubd84\ud22c\uc5d0\uc11c\ub294 Postfix\ub97c \uae30\ubcf8 MTA\ub85c \uc124\uc815\ub418\uc5b4 \uc788\ub2e4. \uac1c\uc778\uc801\uc73c\ub85c Sendmail \ubcf4\ub2e4\ub294 Postfix\ub294 \ube60\ub974\uace0 \uad00\ub9ac\uc640 \ubcf4\uc548\uc774 \uc218\uc6d4\ud558\ub2e4. \uadf8\ub9ac\uace0 Sendmail\uacfc \ud638\ud658\uc774 \ub41c\ub2e4. \uc124\uce58\uc5d0 \uc55e\uc11c \uba54\uc77c\uc11c\ubc84\uc5d0\uc11c \uc0ac\uc6a9\ud558\ub294 \uae30\ubcf8\uc801\uc778 \ud3ec\ud2b8 \ubc88\ud638\ub97c \uc54c\uc544\ub450\uace0 \uc124\uce58 \ud6c4 \ubc29\ud654\ubcbd\uc5d0 \uc801\uc6a9\ud558\uc790. smtp(25), smtps(465), pop3(110), pop3s(995), submission(587, 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