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<h1>Email Gathering with Fetchmail</h1>
<p>To enable the <a href="https://www.fetchmail.info">fetchmail</a> service to retrieve e-mails, set the environment variable <code>ENABLE_FETCHMAIL</code> to <code>1</code>. Your <code>compose.yaml</code> file should look like following snippet:</p>
<div class="highlight"><pre><span></span><code><span class="nt">environment</span><span class="p">:</span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ENABLE_FETCHMAIL=1</span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">FETCHMAIL_POLL=300</span>
</code></pre></div>
<p>Generate a file called <code>fetchmail.cf</code> and place it in the <code>docker-data/dms/config/</code> folder. Your DMS folder should look like this example:</p>
<div class="highlight"><pre><span></span><code>├── docker-data/dms/config
│ ├── dovecot.cf
│ ├── fetchmail.cf
│ ├── postfix-accounts.cf
│ └── postfix-virtual.cf
└── compose.yaml
</code></pre></div>
<h2 id="configuration"><a class="toclink" href="#configuration">Configuration</a></h2>
<p>Configuration options for <code>fetchmail.cf</code> are covered at the <a href="https://www.fetchmail.info/fetchmail-man.html#the-run-control-file">official fetchmail docs</a> (<em>see the section "The run control file" and the table with "keyword" column for all settings</em>).</p>
<div class="admonition example">
<p class="admonition-title">Basic <code>fetchmail.cf</code> configuration</p>
<p>Retrieve mail from <code>remote-user@somewhere.com</code> and deliver it to <code>dms-user@example.com</code>:</p>
<div class="highlight"><pre><span></span><code>poll 'mail.somewhere.com'
proto imap
user 'remote-user'
pass 'secret'
is 'dms-user@example.com'
</code></pre></div>
<ul>
<li><code>poll</code> sets the remote mail server to connect to retrieve mail from.</li>
<li><code>proto</code> lets you connect via IMAP or POP3.</li>
<li><code>user</code> and <code>pass</code> provide the login credentials for the remote mail service account to access.</li>
<li><code>is</code> configures where the fetched mail will be sent to (<em>eg: your local DMS account in <code>docker-data/dms/config/postfix-accounts.cf</code></em>).</li>
</ul>
<hr />
<details class="warning">
<summary><code>proto imap</code> will still delete remote mail once fetched</summary>
<p>This is due to a separate default setting <code>no keep</code>. Adding the setting <code>keep</code> to your config on a new line will prevent deleting the remote copy.</p>
</details>
</div>
<details class="example">
<summary>Multiple users or remote servers</summary>
<p>The official docs <a href="https://www.fetchmail.info/fetchmail-man.html#configuration-examples">config examples</a> show a common convention to indent settings on subsequent lines for visually grouping per server.</p>
<div class="tabbed-set tabbed-alternate" data-tabs="1:2"><input checked="checked" id="minimal-syntax" name="__tabbed_1" type="radio" /><input id="with-optional-syntax" name="__tabbed_1" type="radio" /><div class="tabbed-labels"><label for="minimal-syntax">Minimal syntax</label><label for="with-optional-syntax">With optional syntax</label></div>
<div class="tabbed-content">
<div class="tabbed-block">
<div class="highlight"><pre><span></span><code>poll 'mail.somewhere.com' proto imap
user 'john.doe' pass 'secret' is 'johnny@example.com'
user 'jane.doe' pass 'secret' is 'jane@example.com'
poll 'mail.somewhere-else.com' proto pop3
user 'john.doe@somewhere-else.com' pass 'secret' is 'johnny@example.com'
</code></pre></div>
</div>
<div class="tabbed-block">
<ul>
<li><code>#</code> for adding comments.</li>
<li>The config file may include "noise" keywords to improve readability.</li>
</ul>
<div class="highlight"><pre><span></span><code># Retrieve mail for users `john.doe` and `jane.doe` via IMAP at this remote mail server:
poll 'mail.somewhere.com' with proto imap wants:
user 'john.doe' with pass 'secret', is 'johnny@example.com' here
user 'jane.doe' with pass 'secret', is 'jane@example.com' here
# Also retrieve mail from this mail server (but via POP3).
# NOTE: This could also be all on a single line, or with each key + value as a separate line.
# Notice how the remote username includes a full email address,
# Some mail servers like DMS use the full email address as the username:
poll 'mail.somewhere-else.com' with proto pop3 wants:
user 'john.doe@somewhere-else.com' with pass 'secret', is 'johnny@example.com' here
</code></pre></div>
</div>
</div>
</div>
</details>
<div class="admonition tip">
<p class="admonition-title"><code>FETCHMAIL_POLL</code> ENV: Override default polling interval</p>
<p>By default the fetchmail service will check every 5 minutes for new mail at the configured mail accounts.</p>
<div class="highlight"><pre><span></span><code><span class="nt">environment</span><span class="p">:</span>
<span class="w"> </span><span class="c1"># The fetchmail polling interval in seconds:</span>
<span class="w"> </span><span class="nt">FETCHMAIL_POLL</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">60</span>
</code></pre></div>
</div>
<h2 id="debugging"><a class="toclink" href="#debugging">Debugging</a></h2>
<p>To debug your <code>fetchmail.cf</code> configuration run this <code>setup debug</code> command:</p>
<div class="highlight"><pre><span></span><code>docker<span class="w"> </span><span class="nb">exec</span><span class="w"> </span>-it<span class="w"> </span>dms-container-name<span class="w"> </span>setup<span class="w"> </span>debug<span class="w"> </span>fetchmail
</code></pre></div>
<details class="example">
<summary>Sample output of <code>setup debug fetchmail</code></summary>
<div class="highlight"><pre><span></span><code><span class="go">fetchmail: 6.3.26 querying outlook.office365.com (protocol POP3) at Mon Aug 29 22:11:09 2016: poll started</span>
<span class="go">Trying to connect to 132.245.48.18/995...connected.</span>
<span class="go">fetchmail: Server certificate:</span>
<span class="go">fetchmail: Issuer Organization: Microsoft Corporation</span>
<span class="go">fetchmail: Issuer CommonName: Microsoft IT SSL SHA2</span>
<span class="go">fetchmail: Subject CommonName: outlook.com</span>
<span class="go">fetchmail: Subject Alternative Name: outlook.com</span>
<span class="go">fetchmail: Subject Alternative Name: *.outlook.com</span>
<span class="go">fetchmail: Subject Alternative Name: office365.com</span>
<span class="go">fetchmail: Subject Alternative Name: *.office365.com</span>
<span class="go">fetchmail: Subject Alternative Name: *.live.com</span>
<span class="go">fetchmail: Subject Alternative Name: *.internal.outlook.com</span>
<span class="go">fetchmail: Subject Alternative Name: *.outlook.office365.com</span>
<span class="go">fetchmail: Subject Alternative Name: outlook.office.com</span>
<span class="go">fetchmail: Subject Alternative Name: attachment.outlook.office.net</span>
<span class="go">fetchmail: Subject Alternative Name: attachment.outlook.officeppe.net</span>
<span class="go">fetchmail: Subject Alternative Name: *.office.com</span>
<span class="go">fetchmail: outlook.office365.com key fingerprint: 3A:A4:58:42:56:CD:BD:11:19:5B:CF:1E:85:16:8E:4D</span>
<span class="go">fetchmail: POP3< +OK The Microsoft Exchange POP3 service is ready. [SABFADEAUABSADAAMQBDAEEAMAAwADAANwAuAGUAdQByAHAAcgBkADAAMQAuAHAAcgBvAGQALgBlAHgAYwBoAGEAbgBnAGUAbABhAGIAcwAuAGMAbwBtAA==]</span>
<span class="go">fetchmail: POP3> CAPA</span>
<span class="go">fetchmail: POP3< +OK</span>
<span class="go">fetchmail: POP3< TOP</span>
<span class="go">fetchmail: POP3< UIDL</span>
<span class="go">fetchmail: POP3< SASL PLAIN</span>
<span class="go">fetchmail: POP3< USER</span>
<span class="go">fetchmail: POP3< .</span>
<span class="go">fetchmail: POP3> USER user1@outlook.com</span>
<span class="go">fetchmail: POP3< +OK</span>
<span class="go">fetchmail: POP3> PASS *</span>
<span class="go">fetchmail: POP3< +OK User successfully logged on.</span>
<span class="go">fetchmail: POP3> STAT</span>
<span class="go">fetchmail: POP3< +OK 0 0</span>
<span class="go">fetchmail: No mail for user1@outlook.com at outlook.office365.com</span>
<span class="go">fetchmail: POP3> QUIT</span>
<span class="go">fetchmail: POP3< +OK Microsoft Exchange Server 2016 POP3 server signing off.</span>
<span class="go">fetchmail: 6.3.26 querying outlook.office365.com (protocol POP3) at Mon Aug 29 22:11:11 2016: poll completed</span>
<span class="go">fetchmail: normal termination, status 1</span>
</code></pre></div>
</details>
<div class="admonition tip">
<p class="admonition-title">Troubleshoot with this reference <code>compose.yaml</code></p>
<p><a href="https://github.com/orgs/docker-mailserver/discussions/3994#discussioncomment-9290570">A minimal <code>compose.yaml</code> example</a> demonstrates how to run two instances of DMS locally, with one instance configured with <code>fetchmail.cf</code> and the other to simulate a remote mail server to fetch from.</p>
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