Apache James 메일서버 – 환경설정

0. conf/domainlist.xml

메일서버에서 사용하는 도메인을 지정해준다.
아래 설정에서는 두개의 도메인을 사용하는 것을 기준으로 했다.

jongwan.com
another-domain.com

<?xml version="1.0"?>
<domainlist class="org.apache.james.domainlist.jpa.JPADomainList">
  <autodetect>false</autodetect>
  <autodetectIP>false</autodetectIP>
  <defaultDomain>jongwan.com</defaultDomain>
    <domainnames>
      <domainname>jongwan.com</domainname>      
      <domainname>another-domain.com</domainname>
    </domainnames>
</domainlist>

defaultDomain : 기본 도메인을 지정한다. domainname 항목중에 하나를 지정한다.
domainnames.domainname : 사용할 도메인을 추가한다. domainname 항목을 추가해서 여러개의 도메인을 사용할 수 있다.

1. conf/dnsservice.xml

DNS 서버를 지정한다. 자동으로 했을 때 문제가 있어 강제로 지정했다.

<?xml version="1.0"?>
<dnsservice>
  <servers>
    <server>1.1.1.1</server>
  </servers>
  <autodiscover>false</autodiscover>
  <authoritative>false</authoritative>
  <maxcachesize>50000</maxcachesize>
</dnsservice>

autodiscover : 기본값은 true인데, 동작을 잘 안해서 변경했다.
servers.server : 1.1.1.1로 강제 지정했다.

2. keystore

TLS사용을 위해서 키를 생성한다.
smtpserver.xml, imapserver.xml에서 사용한다.

/usr/local/james 위치에 설치기준

keytool -genkey -alias james -keyalg RSA -storetype PKCS12 -keystore /usr/local/james/conf/keystore

Enter keystore password: 
Re-enter new password:
What is your first and last name?
  [Unknown]:  Jongwan Kim
What is the name of your organizational unit?
  [Unknown]:  None
What is the name of your organization?
  [Unknown]:  None
What is the name of your City or Locality?
  [Unknown]:  Seoul
What is the name of your State or Province?
  [Unknown]:  Guro-gu
What is the two-letter country code for this unit?
  [Unknown]:  KR
Is CN=Jongwan Kim, OU=None, O=None, L=Seoul, ST=Guro-gu, C=KR correct?
  [no]:  y

3. conf/smtpserver.xml

메일 발송을 위한 SMTP 설정을 한다.
25번 포트와 465번 포트설정이 각각 smtpserver 항목으로 있다.

<?xml version="1.0"?>
<smtpservers>
  <smtpserver enabled="true">
    <jmxName>smtpserver</jmxName>
    <bind>0.0.0.0:25</bind>
    <connectionBacklog>200</connectionBacklog>
    <tls socketTLS="false" startTLS="false">
      <keystore>file://conf/keystore</keystore>
      <keystoreType>PKCS12</keystoreType>
      <secret>123456</secret>
      <provider>org.bouncycastle.jce.provider.BouncyCastleProvider</provider>
      <algorithm>SunX509</algorithm>
    </tls>
    <connectiontimeout>360</connectiontimeout>
    <connectionLimit>0</connectionLimit>
    <connectionLimitPerIP>0</connectionLimitPerIP>
    <auth>
      <plainAuthEnabled>true</plainAuthEnabled>
    </auth>
    <authorizedAddresses>127.0.0.0/24, 192.168.0.0/24, 100.100.100.0/24</authorizedAddresses>
    <maxmessagesize>0</maxmessagesize>
    <addressBracketsEnforcement>true</addressBracketsEnforcement>
    <handlerchain>
      <handler class="org.apache.james.smtpserver.fastfail.ValidRcptHandler"/>
      <handler class="org.apache.james.smtpserver.CoreCmdHandlerLoader"/>       
    </handlerchain>           
  </smtpserver>
  <smtpserver enabled="true">
    <jmxName>smtpservertls</jmxName>
    <bind>0.0.0.0:465</bind>
    <connectionBacklog>200</connectionBacklog>
    <tls socketTLS="false" startTLS="true">
      <keystore>file://conf/keystore</keystore>
      <keystoreType>PKCS12</keystoreType>
      <secret>123456</secret>
      <provider>org.bouncycastle.jce.provider.BouncyCastleProvider</provider>
      <algorithm>SunX509</algorithm>
    </tls>
    <connectiontimeout>360</connectiontimeout>
    <connectionLimit>0</connectionLimit>
    <connectionLimitPerIP>0</connectionLimitPerIP>
    <auth>
      <plainAuthEnabled>true</plainAuthEnabled>
    </auth>
    <authorizedAddresses>127.0.0.0/24, 192.168.0.0/24, 100.100.100.0/24</authorizedAddresses>
    <maxmessagesize>0</maxmessagesize>
    <addressBracketsEnforcement>true</addressBracketsEnforcement>
    <handlerchain>
      <handler class="org.apache.james.smtpserver.fastfail.ValidRcptHandler"/>
      <handler class="org.apache.james.smtpserver.CoreCmdHandlerLoader"/>       
    </handlerchain>           
  </smtpserver>
</smtpservers>

jmxName : smtpserver, smtpservertls 두가지 항목이 각각 smtpserver 항목에 있다. smtpserver 항목마다 jmxName이 달라야 오류가 발생하지 않는다.
bind : 각각 0.0.0.0:25, 0.0.0.0:465 을 설정한다.
tls : 465포트를 사용하는 0.0.0.0:465에 대해서 startTLS=”true” 를 변경
tls.keystore : /usr/local/james/ 폴더를 기준으로 이전에 생성한 keystore를 지정해준다.
tls.secret : keystore 생성시 사용한 비밀번호
authorizedAddresses : 인증없이 접속가능한 아이피 대역을 쉼표 기준으로 입력한다.

4. imapserver.xml

IMAP 사용을 위해서 143, 993 포트 설정을 한다.
imapserver 항목으로 추가가 가능하다.

<?xml version="1.0"?>
<imapservers>
  <imapserver enabled="true">
    <jmxName>imapserver</jmxName>
    <bind>0.0.0.0:143</bind>
    <connectionBacklog>200</connectionBacklog>
    <tls socketTLS="false" startTLS="false">
      <keystore>file://conf/keystore</keystore>
      <keystoreType>PKCS12</keystoreType>
      <secret>123456</secret>
      <provider>org.bouncycastle.jce.provider.BouncyCastleProvider</provider>
    </tls>
    <connectionLimit>0</connectionLimit>
    <connectionLimitPerIP>0</connectionLimitPerIP>
    <plainAuthDisallowed>false</plainAuthDisallowed>
    <auth>
      <plainAuthEnabled>true</plainAuthEnabled>
    </auth>
  </imapserver>
  <imapserver enabled="true">
    <jmxName>imapservertls</jmxName>
    <bind>0.0.0.0:993</bind>
    <connectionBacklog>200</connectionBacklog>
    <tls socketTLS="false" startTLS="true">
      <keystore>file://conf/keystore</keystore>
      <keystoreType>PKCS12</keystoreType>
      <secret>123456</secret>
      <provider>org.bouncycastle.jce.provider.BouncyCastleProvider</provider>
    </tls>
    <connectionLimit>0</connectionLimit>
    <connectionLimitPerIP>0</connectionLimitPerIP>
    <plainAuthDisallowed>false</plainAuthDisallowed>
    <auth>
      <plainAuthEnabled>true</plainAuthEnabled>
    </auth>
  </imapserver>
</imapservers>

imapserver.jmxName : 143, 993 두가지 항목에 대해서 이름을 다르게 지정한다.
tls : 993 포트 지정시 startTLS=”true” 로 변경
tls.keystore : 위에서 생성한 keystore를 지정해준다.
plainAuthDisallowed : 기본값은 true 이고, 외부에서 접속시 암호화 없는 비밀번호를 사용하려고 false로 변경했다.

5. pop3server.xml

POP3는 사용하지 않는다.

<?xml version="1.0"?>
<pop3servers>
  <pop3server enabled="false"
</pop3servers>

pop3server : 사용하지 않으려고 enabled=”false”로 변경

6. mailetcontainer.xml

메일 송/수신관련된 복잡한 설정이 있다.

<?xml version="1.0"?>
<mailetcontainer enableJmx="true">
  <context>
    <postmaster>me@jongwan.com</postmaster>
  </context>
  <spooler>
    <threads>20</threads>
    <errorRepository>file://var/mail/error/</errorRepository>
  </spooler>
  <processors>
    <processor state="root" enableJmx="true">
      <mailet match="All" class="PostmasterAlias"/>
      <mailet match="RelayLimit=30" class="Null"/>
      <mailet match="HasMailAttribute=spamChecked" class="ToProcessor">
        <processor>transport</processor>
      </mailet>
      <mailet match="All" class="SetMailAttribute">
        <spamChecked>true</spamChecked>
      </mailet>
      <mailet match="SMTPAuthSuccessful" class="ToProcessor">
        <processor>transport</processor>
      </mailet>
      <mailet match="All" class="ToProcessor">
        <processor>transport</processor>
      </mailet>
    </processor>
    <processor state="error" enableJmx="true">
      <mailet match="All" class="ToRepository">
        <repositoryPath>file://var/mail/error/</repositoryPath>
      </mailet>
    </processor>
    <processor state="transport" enableJmx="true">
      <mailet match="SenderIsRegex=(.*)@jongwan\.com" class="org.apache.james.jdkim.mailets.DKIMSign">
        <signatureTemplate>v=1; s=mail; d=jongwan.com ; h=from : reply-to : subject : date : to : cc : resent-date : resent-from : resent-sender : resent-to : resent-cc : in-reply-to : references : list-id : list-help : list-unsubscribe : list-subscribe : list-post : list-owner : list-archive; a=rsa-sha256; bh=; b=;</signatureTemplate>
        <privateKey>
-----BEGIN RSA PRIVATE KEY-----
# 여기에 Private Key 입력
-----END RSA PRIVATE KEY-----
        </privateKey>
      </mailet>
      <mailet match="SenderIsRegex=(.*)@another-domain\.com" class="org.apache.james.jdkim.mailets.DKIMSign">
        <signatureTemplate>v=1; s=mail; d=another-domain.com ; h=from : reply-to : subject : date : to : cc : resent-date : resent-from : resent-sender : resent-to : resent-cc : in-reply-to : references : list-id : list-help : list-unsubscribe : list-subscribe : list-post : list-owner : list-archive; a=rsa-sha256; bh=; b=;</signatureTemplate>
          <privateKey>
-----BEGIN RSA PRIVATE KEY-----
# 여기에 Private Key 입력
-----END RSA PRIVATE KEY-----
        </privateKey>
      </mailet>
      <mailet match="SMTPAuthSuccessful" class="SetMimeHeader">
        <name>X-UserIsAuth</name>
        <value>true</value>
        <onMailetException>ignore</onMailetException>
      </mailet>
      <mailet match="HasMailAttribute=org.apache.james.SMIMECheckSignature" class="SetMimeHeader">
        <name>X-WasSigned</name>
        <value>true</value>
        <onMailetException>ignore</onMailetException>
      </mailet>
      <mailet match="All" class="RecipientRewriteTable" />
      <mailet match="RecipientIsLocal" class="Sieve"/>
      <mailet match="RecipientIsLocal" class="AddDeliveredToHeader"/>
      <mailet match="RecipientIsLocal" class="LocalDelivery"/>
      <mailet match="HostIsLocal" class="ToProcessor">
        <processor>local-address-error</processor>
        <notice>550 - Requested action not taken: no such user here</notice>
      </mailet>
      <mailet match="All" class="RemoteDelivery">
        <outgoing>outgoing</outgoing>
        <startTLS>true</startTLS>
        <mail.smtp.ssl.trust>*</mail.smtp.ssl.trust>
        <delayTime>5000, 100000, 500000</delayTime>
        <maxRetries>3</maxRetries>
        <maxDnsProblemRetries>0</maxDnsProblemRetries>
        <deliveryThreads>10</deliveryThreads>
        <sendpartial>true</sendpartial>
        <bounceProcessor>bounces</bounceProcessor>
      </mailet>
    </processor>
    <processor state="over-quota" enableJmx="true">
      <mailet match="All" class="MetricsMailet">
        <metricName>mailet-over-quota-error</metricName>
      </mailet>
      <mailet match="All" class="Bounce">
        <message>The following recipients do not have enough space for storing the email you sent them.</message>
        <attachment>none</attachment>
      </mailet>
      <mailet match="All" class="ToRepository">
        <repositoryPath>file://var/mail/over-quota-error/</repositoryPath>
      </mailet>
    </processor>
    <processor state="spam" enableJmx="true">
      <mailet match="All" class="ToRepository">
        <repositoryPath>file://var/mail/spam/</repositoryPath>
      </mailet>
    </processor>
    <processor state="virus" enableJmx="true">
      <mailet match="All" class="SetMailAttribute">
        <org.apache.james.infected>true, bouncing</org.apache.james.infected>
      </mailet>
      <mailet match="SMTPAuthSuccessful" class="Bounce">
        <inline>heads</inline>
        <attachment>none</attachment>
        <notice>Warning: We were unable to deliver the message below because it was found infected by virus(es).</notice>
      </mailet>
      <mailet match="All" class="Null" />
    </processor>
    <processor state="local-address-error" enableJmx="true">
      <mailet match="All" class="ToRepository">
        <repositoryPath>file://var/mail/address-error/</repositoryPath>
      </mailet>
    </processor>
    <processor state="relay-denied" enableJmx="true">
      <mailet match="All" class="ToRepository">
        <repositoryPath>file://var/mail/relay-denied/</repositoryPath>
      </mailet>
    </processor>
    <processor state="bounces" enableJmx="true">
      <mailet match="All" class="DSNBounce">
        <passThrough>false</passThrough>
      </mailet>
    </processor>
  </processors>
</mailetcontainer>

기본설정에서 변경된 부분만 설명한다.

<mailet match="SenderIsRegex=(.*)@jongwan\.com" class="org.apache.james.jdkim.mailets.DKIMSign">
  <signatureTemplate>v=1; s=mail; d=jongwan.com ; h=from : reply-to : subject : date : to : cc : resent-date : resent-from : resent-sender : resent-to : resent-cc : in-reply-to : references : list-id : list-help : list-unsubscribe : list-subscribe : list-post : list-owner : list-archive; a=rsa-sha256; bh=; b=;</signatureTemplate>
  <privateKey>
-----BEGIN RSA PRIVATE KEY-----
# 여기에 Private Key 입력
-----END RSA PRIVATE KEY-----
  </privateKey>
</mailet>

DKIM 설정을 위해서 <processor state=”transport”> 항목의 가장위에 추가한다.
도메인별로 키가 다르므로 match=”SenderIsRegex=…” 를 사용해서 발송시 도메인별로 헤더를 다르게 추가해준다.

<mailet match="All" class="RemoteDelivery">
  ...
  <startTLS>true</startTLS>
  <mail.smtp.ssl.trust>*</mail.smtp.ssl.trust>
  ...
</mailet>

구글메일에서 위와같이 나올경우

위처럼 암호화관련 경고나 나오면 <startTLS>true</startTLS>를 추가한다.

직접 생성한 인증서를 사용해서 경고가 나올 경우 <mail.smpt.ssl.trust>*</mail.smpt.ssl.trust> 항목을 추가한다.

외부로 메일발송 허용

<mailet match="RemoteAddrNotInNetwork=127.0.0.1" class="ToProcessor">
  <processor>relay-denied</processor>
  <notice>550 - Requested action not taken: relaying denied</notice>
</mailet>

이 규칙이 있으면 외부로 메일이 발송되지 않는다.
내부메일서버로만 사용한다면 놔두고, 외부로 메일발송이 필요하다면 주석처리해야한다.