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| <h1 class="page">Distributed James Server — smtpserver.xml</h1> |
| <div class="sect1"> |
| <h2 id="_incoming_smtp"><a class="anchor" href="#_incoming_smtp"></a>Incoming SMTP</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Consult this <a href="https://github.com/apache/james-project/blob/master/dockerfiles/run/guice/cassandra-rabbitmq/destination/conf/smtpserver.xml">example</a> |
| to get some examples and hints.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The SMTP service is controlled by a configuration block in the smptserver.xml. |
| The smtpserver tag defines the boundaries of the configuration block. It encloses |
| all the relevant configuration for the SMTP server. The behavior of the SMTP service is |
| controlled by the attributes and children of this tag.</p> |
| </div> |
| <div class="paragraph"> |
| <p>This tag has an optional boolean attribute - <strong>enabled</strong> - that defines whether the service is active or not. The value defaults to "true" if |
| not present.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The standard children of the smtpserver tag are:</p> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <caption class="title">Table 1. smtpserver.xml content</caption> |
| <colgroup> |
| <col style="width: 50%;"> |
| <col style="width: 50%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Property name</th> |
| <th class="tableblock halign-left valign-top">explanation</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">bind</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">A list of address:port separed by comma - This is an optional value. If present, this value is a string describing |
| the IP address to which this service should be bound. If the tag or value is absent then the service |
| will bind to all network interfaces for the machine on port 25. Port 25 is the well-known/IANA registered port for SMTP. |
| Port 465 is the well-known/IANA registered port for SMTP over TLS.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">connectBacklog</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">The IP address (host name) the MBean Server will bind/listen to.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">tls</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Set to true to support STARTTLS or SSL for the Socket. |
| To use this you need to copy sunjce_provider.jar to /path/james/lib directory. To create a new keystore execute: |
| <code>keytool -genkey -alias james -keyalg RSA -keystore /path/to/james/conf/keystore</code>. |
| The algorithm is optional and only needs to be specified when using something other |
| than the Sun JCE provider - You could use IbmX509 with IBM Java runtime. |
| Please note that each SMTP/LMTP server exposed on different port can specify its own keystore, independently from any other |
| TLS based protocols.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">helloName</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">This is a required tag with an optional body that defines the server name |
| used in the initial service greeting. The tag may have an optional attribute - <strong>autodetect</strong>. If |
| the autodetect attribute is present and true, the service will use the local hostname |
| returned by the Java libraries. If autodetect is absent or false, the body of the tag will be used. In |
| this case, if no body is present, the value "localhost" will be used.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">connectionTimeout</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">This is an optional tag with a non-negative integer body. Connection timeout in seconds.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">connectionLimit</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Set the maximum simultaneous incoming connections for this service.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">connectionLimitPerIP</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Set the maximum simultaneous incoming connections per IP for this service.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">handler.authRequired</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">This is an optional tag with a boolean body. If true, then the server will |
| require authentication before delivering mail to non-local email addresses. If this tag is absent, or the value |
| is false then the client will not be prompted for authentication. Only simple user/password authentication is |
| supported at this time. supported values:</p> |
| <p class="tableblock">* true: required but announced only to not authorizedAddresses |
| * false: don’t use AUTH |
| * announce: like true, but always announce AUTH capability to clients</p> |
| <p class="tableblock">The correct behaviour per RFC value would be false or announce |
| but we still support true for backward compatibility and because |
| some webmail client fails when AUTH is announced but no authentication |
| information has been provided</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">authorizedAddresses</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Authorize specific addresses/networks.</p> |
| <p class="tableblock">If you use SMTP AUTH, addresses that match those specified here will |
| be permitted to relay without SMTP AUTH. If you do not use SMTP |
| AUTH, and you specify addreses here, then only addresses that match |
| those specified will be permitted to relay.</p> |
| <p class="tableblock">Addresses may be specified as a an IP address or domain name, with an |
| optional netmask, e.g.,</p> |
| <p class="tableblock">127.*, 127.0.0.0/8, 127.0.0.0/255.0.0.0, and localhost/8 are all the same</p> |
| <p class="tableblock">See also the RemoteAddrNotInNetwork matcher in the transport processor. |
| You would generally use one OR the other approach.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">verifyIdentity</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">This is an optional tag with a boolean body. This option can only be used |
| if SMTP authentication is required. If the parameter is set to true then the sender address for the submitted message |
| will be verified against the authenticated subject. Verify sender addresses, ensuring that |
| the sender address matches the user who has authenticated. |
| It will verify that the sender address matches the address of the user or one of its alias (from user or domain aliases). |
| This prevents a user of your mail server from acting as someone else |
| If unspecified, default value is true.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">maxmessagesize</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">This is an optional tag with a non-negative integer body. It specifies the maximum |
| size, in kbytes, of any message that will be transmitted by this SMTP server. It is a service-wide, as opposed to |
| a per user, limit. If the value is zero then there is no limit. If the tag isn’t specified, the service will |
| default to an unlimited message size.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">heloEhloEnforcement</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">This sets whether to enforce the use of HELO/EHLO salutation before a |
| MAIL command is accepted. If unspecified, the value defaults to true.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">smtpGreeting</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">This sets the SMTPGreeting which will be used when connect to the smtpserver |
| If none is specified a default is generated</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">handlerchain</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">The configuration handler chain. See <a href="smtp-hooks.html" class="xref page">this page</a> for configuring out-of the |
| box extra SMTP handlers and hooks.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_about_open_relays"><a class="anchor" href="#_about_open_relays"></a>About open relays</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Authenticated SMTP is a method of securing your SMTP server. With SMTP AUTH enabled senders who wish to |
| relay mail through the SMTP server (that is, send mail that is eventually to be delivered to another SMTP |
| server) must authenticate themselves to Apache James Server before sending their message. Mail that is to be delivered |
| locally does not require authentication. This method ensures that spammers cannot use your SMTP server |
| to send unauthorized mail, while still enabling users who may not have fixed IP addresses to send their |
| messages.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Mail servers that allow spammers to send unauthorized email are known as open relays. So SMTP AUTH |
| is a mechanism for ensuring that your server is not an open relay.</p> |
| </div> |
| <div class="paragraph"> |
| <p>It is extremely important that your server not be configured as an open relay. Aside from potential |
| costs associated with usage by spammers, connections from servers that are determined to be open relays |
| are routinely rejected by SMTP servers. This can severely impede the ability of your mail server to |
| send mail.</p> |
| </div> |
| <div class="paragraph"> |
| <p>At this time Apache James Server only supports simple user name / password authentication.</p> |
| </div> |
| <div class="paragraph"> |
| <p>As mentioned above, SMTP AUTH requires that Apache James Server be able to distinguish between mail intended |
| for local delivery and mail intended for remote delivery. Apache James Server makes this determination by matching the |
| domain to which the mail was sent against the <strong>DomainList</strong> component, configured by |
| <a href="domainlist.html" class="xref page"><strong>domainlist.xml</strong></a>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The Distributed Server is configured out of the box so as to not serve as an open relay for spammers. This is done |
| by relayed emails originate from a trusted source. This includes:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Authenticated SMTP/JMAP users</p> |
| </li> |
| <li> |
| <p>Mails generated by the server (eg: bounces)</p> |
| </li> |
| <li> |
| <p>Mails originating froma trusted network as configured in <strong>smtpserver.xml</strong></p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>If you wish to ensure that authenticated users can only send email from their own account, you may |
| optionally set the verifyIdentity element of the smtpserver configuration block to "true".</p> |
| </div> |
| <div class="sect2"> |
| <h3 id="_verification"><a class="anchor" href="#_verification"></a>Verification</h3> |
| <div class="paragraph"> |
| <p>Verify that you have not inadvertently configured your server as an open relay. This is most easily |
| accomplished by using the service provided at <a href="https://mxtoolbox.com/diagnostic.aspx">mxtoolbox.com</a>. mxtoolbox.com will |
| check your mail server and inform you if it is an open relay. This tool further more verifies additional propertiess like:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Your DNS condifuration, especially that you mail server IP has a valid reverse DNS entry</p> |
| </li> |
| <li> |
| <p>That your SMTP connection is secured</p> |
| </li> |
| <li> |
| <p>That you are not an OpenRelay</p> |
| </li> |
| <li> |
| <p>This website also allow a quick lookup to ensure your mail server is not in public blacklists.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>Of course it is also necessary to confirm that users and log in and send |
| mail through your server. This can be accomplished using any standard mail client (i.e. Thunderbird, Outlook, |
| Eudora, Evolution).</p> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_lmtp_configuration"><a class="anchor" href="#_lmtp_configuration"></a>LMTP Configuration</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Consult this <a href="https://github.com/apache/james-project/blob/master/dockerfiles/run/guice/cassandra-rabbitmq/destination/conf/lmtpserver.xml">example</a> |
| to get some examples and hints.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The configuration is the same of for SMTP.</p> |
| </div> |
| <div class="paragraph"> |
| <p>By default, it is deactivated. You can activate it alongside SMTP and bind for example on port 24.</p> |
| </div> |
| </div> |
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