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SMTP transport
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<h1>SMTP transport</h1>
<p>This transport uses the SMTP protocol to send emails over the network (locally or remotely).</p>
<p>It is desinged to be:</p>
<ul>
<li>Secured: email are encrypted by default</li>
<li>Modern: Unicode support for email content and sender/recipient adresses when compatible</li>
<li>Fast: supports tcp connection reuse</li>
</ul>
<p>This client is designed to send emails to a relay server, and should <em>not</em> be used to send
emails directly to the destination.</p>
<p>The relay server can be the local email server, a specific host or a third-party service.</p>
<h4 id="simple-example">Simple example</h4>
<p>This is the most basic example of usage:</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-rust" data-lang="rust"><span style="color:#66d9ef">use</span><span style=""> </span><span style="">lettre</span><span style="">::</span><span style="">{</span><span style="">SimpleSendableEmail</span><span style="">,</span><span style=""> </span><span style="">EmailTransport</span><span style="">,</span><span style=""> </span><span style="">EmailAddress</span><span style="">,</span><span style=""> </span><span style="">SmtpTransport</span><span style="">};</span><span style="">
</span><span style="">
</span><span style=""></span><span style="color:#66d9ef">let</span><span style=""> </span><span style="">email</span><span style=""> </span><span style="color:#f92672">=</span><span style=""> </span><span style="">SimpleSendableEmail</span><span style="">::</span><span style="">new</span><span style="">(</span><span style="">
</span><span style=""> </span><span style="">EmailAddress</span><span style="">::</span><span style="">new</span><span style="">(</span><span style="color:#e6db74">&#34;user@localhost&#34;</span><span style="">.</span><span style="">to_string</span><span style="">()),</span><span style="">
</span><span style=""> </span><span style="">vec</span><span style="color:#f92672">!</span><span style="">[</span><span style="">EmailAddress</span><span style="">::</span><span style="">new</span><span style="">(</span><span style="color:#e6db74">&#34;root@localhost&#34;</span><span style="">.</span><span style="">to_string</span><span style="">())],</span><span style="">
</span><span style=""> </span><span style="color:#e6db74">&#34;message_id&#34;</span><span style="">.</span><span style="">to_string</span><span style="">(),</span><span style="">
</span><span style=""> </span><span style="color:#e6db74">&#34;Hello world&#34;</span><span style="">.</span><span style="">to_string</span><span style="">(),</span><span style="">
</span><span style=""> </span><span style="">);</span><span style="">
</span><span style="">
</span><span style=""></span><span style="color:#75715e">// Open a local connection on port 25
</span><span style="color:#75715e"></span><span style="color:#66d9ef">let</span><span style=""> </span><span style="color:#66d9ef">mut</span><span style=""> </span><span style="">mailer</span><span style=""> </span><span style="color:#f92672">=</span><span style="">
</span><span style=""></span><span style="">SmtpTransport</span><span style="">::</span><span style="">builder_unencrypted_localhost</span><span style="">().</span><span style="">unwrap</span><span style="">().</span><span style="">build</span><span style="">();</span><span style="">
</span><span style=""></span><span style="color:#75715e">// Send the email
</span><span style="color:#75715e"></span><span style="color:#66d9ef">let</span><span style=""> </span><span style="">result</span><span style=""> </span><span style="color:#f92672">=</span><span style=""> </span><span style="">mailer</span><span style="">.</span><span style="">send</span><span style="">(</span><span style="color:#f92672">&amp;</span><span style="">email</span><span style="">);</span><span style="">
</span><span style="">
</span><span style=""></span><span style="">assert</span><span style="color:#f92672">!</span><span style="">(</span><span style="">result</span><span style="">.</span><span style="">is_ok</span><span style="">());</span></code></pre>
</div>
<h4 id="complete-example">Complete example</h4>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-rust" data-lang="rust"><span style="color:#66d9ef">use</span><span style=""> </span><span style="">lettre</span><span style="">::</span><span style="">smtp</span><span style="">::</span><span style="">authentication</span><span style="">::</span><span style="">{</span><span style="">Credentials</span><span style="">,</span><span style=""> </span><span style="">Mechanism</span><span style="">};</span><span style="">
</span><span style=""></span><span style="color:#66d9ef">use</span><span style=""> </span><span style="">lettre</span><span style="">::</span><span style="">smtp</span><span style="">::</span><span style="">SUBMISSION_PORT</span><span style="">;</span><span style="">
</span><span style=""></span><span style="color:#66d9ef">use</span><span style=""> </span><span style="">lettre</span><span style="">::</span><span style="">{</span><span style="">SimpleSendableEmail</span><span style="">,</span><span style=""> </span><span style="">EmailTransport</span><span style="">,</span><span style=""> </span><span style="">EmailAddress</span><span style="">,</span><span style=""> </span><span style="">SmtpTransport</span><span style="">};</span><span style="">
</span><span style=""></span><span style="color:#66d9ef">use</span><span style=""> </span><span style="">lettre</span><span style="">::</span><span style="">smtp</span><span style="">::</span><span style="">extension</span><span style="">::</span><span style="">ClientId</span><span style="">;</span><span style="">
</span><span style=""></span><span style="color:#66d9ef">use</span><span style=""> </span><span style="">lettre</span><span style="">::</span><span style="">smtp</span><span style="">::</span><span style="">ConnectionReuseParameters</span><span style="">;</span><span style="">
</span><span style="">
</span><span style="">
</span><span style=""></span><span style="color:#66d9ef">let</span><span style=""> </span><span style="">email</span><span style=""> </span><span style="color:#f92672">=</span><span style=""> </span><span style="">SimpleSendableEmail</span><span style="">::</span><span style="">new</span><span style="">(</span><span style="">
</span><span style=""> </span><span style="">EmailAddress</span><span style="">::</span><span style="">new</span><span style="">(</span><span style="color:#e6db74">&#34;user@localhost&#34;</span><span style="">.</span><span style="">to_string</span><span style="">()),</span><span style="">
</span><span style=""> </span><span style="">vec</span><span style="color:#f92672">!</span><span style="">[</span><span style="">EmailAddress</span><span style="">::</span><span style="">new</span><span style="">(</span><span style="color:#e6db74">&#34;root@localhost&#34;</span><span style="">.</span><span style="">to_string</span><span style="">())],</span><span style="">
</span><span style=""> </span><span style="color:#e6db74">&#34;message_id&#34;</span><span style="">.</span><span style="">to_string</span><span style="">(),</span><span style="">
</span><span style=""> </span><span style="color:#e6db74">&#34;Hello world&#34;</span><span style="">.</span><span style="">to_string</span><span style="">(),</span><span style="">
</span><span style=""> </span><span style="">);</span><span style="">
</span><span style="">
</span><span style=""></span><span style="color:#75715e">// Connect to a remote server on a custom port
</span><span style="color:#75715e"></span><span style="color:#66d9ef">let</span><span style=""> </span><span style="color:#66d9ef">mut</span><span style=""> </span><span style="">mailer</span><span style=""> </span><span style="color:#f92672">=</span><span style=""> </span><span style="">SmtpTransport</span><span style="">::</span><span style="">simple_builder</span><span style="">(</span><span style="color:#e6db74">&#34;server.tld&#34;</span><span style="">.</span><span style="">to_string</span><span style="">()).</span><span style="">unwrap</span><span style="">()</span><span style="">
</span><span style=""> </span><span style="color:#75715e">// Set the name sent during EHLO/HELO, default is `localhost`
</span><span style="color:#75715e"></span><span style=""> </span><span style="">.</span><span style="">hello_name</span><span style="">(</span><span style="">ClientId</span><span style="">::</span><span style="">Domain</span><span style="">(</span><span style="color:#e6db74">&#34;my.hostname.tld&#34;</span><span style="">.</span><span style="">to_string</span><span style="">()))</span><span style="">
</span><span style=""> </span><span style="color:#75715e">// Add credentials for authentication
</span><span style="color:#75715e"></span><span style=""> </span><span style="">.</span><span style="">credentials</span><span style="">(</span><span style="">Credentials</span><span style="">::</span><span style="">new</span><span style="">(</span><span style="color:#e6db74">&#34;username&#34;</span><span style="">.</span><span style="">to_string</span><span style="">(),</span><span style=""> </span><span style="color:#e6db74">&#34;password&#34;</span><span style="">.</span><span style="">to_string</span><span style="">()))</span><span style="">
</span><span style=""> </span><span style="color:#75715e">// Enable SMTPUTF8 if the server supports it
</span><span style="color:#75715e"></span><span style=""> </span><span style="">.</span><span style="">smtp_utf8</span><span style="">(</span><span style="color:#66d9ef">true</span><span style="">)</span><span style="">
</span><span style=""> </span><span style="color:#75715e">// Configure expected authentication mechanism
</span><span style="color:#75715e"></span><span style=""> </span><span style="">.</span><span style="">authentication_mechanism</span><span style="">(</span><span style="">Mechanism</span><span style="">::</span><span style="">Plain</span><span style="">)</span><span style="">
</span><span style=""> </span><span style="color:#75715e">// Enable connection reuse
</span><span style="color:#75715e"></span><span style=""> </span><span style="">.</span><span style="">connection_reuse</span><span style="">(</span><span style="">ConnectionReuseParameters</span><span style="">::</span><span style="">ReuseUnlimited</span><span style="">).</span><span style="">build</span><span style="">();</span><span style="">
</span><span style="">
</span><span style=""></span><span style="color:#66d9ef">let</span><span style=""> </span><span style="">result_1</span><span style=""> </span><span style="color:#f92672">=</span><span style=""> </span><span style="">mailer</span><span style="">.</span><span style="">send</span><span style="">(</span><span style="color:#f92672">&amp;</span><span style="">email</span><span style="">);</span><span style="">
</span><span style=""></span><span style="">assert</span><span style="color:#f92672">!</span><span style="">(</span><span style="">result_1</span><span style="">.</span><span style="">is_ok</span><span style="">());</span><span style="">
</span><span style="">
</span><span style=""></span><span style="color:#75715e">// The second email will use the same connection
</span><span style="color:#75715e"></span><span style="color:#66d9ef">let</span><span style=""> </span><span style="">result_2</span><span style=""> </span><span style="color:#f92672">=</span><span style=""> </span><span style="">mailer</span><span style="">.</span><span style="">send</span><span style="">(</span><span style="color:#f92672">&amp;</span><span style="">email</span><span style="">);</span><span style="">
</span><span style=""></span><span style="">assert</span><span style="color:#f92672">!</span><span style="">(</span><span style="">result_2</span><span style="">.</span><span style="">is_ok</span><span style="">());</span><span style="">
</span><span style="">
</span><span style=""></span><span style="color:#75715e">// Explicitly close the SMTP transaction as we enabled connection reuse
</span><span style="color:#75715e"></span><span style="">mailer</span><span style="">.</span><span style="">close</span><span style="">();</span></code></pre>
</div>
<h4 id="lower-level">Lower level</h4>
<p>You can also send commands, here is a simple email transaction without
error handling:</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-rust" data-lang="rust"><span style="color:#66d9ef">use</span><span style=""> </span><span style="">lettre</span><span style="">::</span><span style="">EmailAddress</span><span style="">;</span><span style="">
</span><span style=""></span><span style="color:#66d9ef">use</span><span style=""> </span><span style="">lettre</span><span style="">::</span><span style="">smtp</span><span style="">::</span><span style="">SMTP_PORT</span><span style="">;</span><span style="">
</span><span style=""></span><span style="color:#66d9ef">use</span><span style=""> </span><span style="">lettre</span><span style="">::</span><span style="">smtp</span><span style="">::</span><span style="">client</span><span style="">::</span><span style="">Client</span><span style="">;</span><span style="">
</span><span style=""></span><span style="color:#66d9ef">use</span><span style=""> </span><span style="">lettre</span><span style="">::</span><span style="">smtp</span><span style="">::</span><span style="">client</span><span style="">::</span><span style="">net</span><span style="">::</span><span style="">NetworkStream</span><span style="">;</span><span style="">
</span><span style=""></span><span style="color:#66d9ef">use</span><span style=""> </span><span style="">lettre</span><span style="">::</span><span style="">smtp</span><span style="">::</span><span style="">extension</span><span style="">::</span><span style="">ClientId</span><span style="">;</span><span style="">
</span><span style=""></span><span style="color:#66d9ef">use</span><span style=""> </span><span style="">lettre</span><span style="">::</span><span style="">smtp</span><span style="">::</span><span style="">commands</span><span style="">::</span><span style="color:#f92672">*</span><span style="">;</span><span style="">
</span><span style="">
</span><span style=""></span><span style="color:#66d9ef">let</span><span style=""> </span><span style="color:#66d9ef">mut</span><span style=""> </span><span style="">email_client</span><span style="">: </span><span style="color:#a6e22e">Client</span><span style="color:#f92672">&lt;</span><span style="">NetworkStream</span><span style="color:#f92672">&gt;</span><span style=""> </span><span style="color:#f92672">=</span><span style=""> </span><span style="">Client</span><span style="">::</span><span style="">new</span><span style="">();</span><span style="">
</span><span style=""></span><span style="color:#66d9ef">let</span><span style=""> </span><span style="">_</span><span style=""> </span><span style="color:#f92672">=</span><span style=""> </span><span style="">email_client</span><span style="">.</span><span style="">connect</span><span style="">(</span><span style="color:#f92672">&amp;</span><span style="">(</span><span style="color:#e6db74">&#34;localhost&#34;</span><span style="">,</span><span style=""> </span><span style="">SMTP_PORT</span><span style="">),</span><span style=""> </span><span style="">None</span><span style="">);</span><span style="">
</span><span style=""></span><span style="color:#66d9ef">let</span><span style=""> </span><span style="">_</span><span style=""> </span><span style="color:#f92672">=</span><span style=""> </span><span style="">email_client</span><span style="">.</span><span style="">smtp_command</span><span style="">(</span><span style="">EhloCommand</span><span style="">::</span><span style="">new</span><span style="">(</span><span style="">ClientId</span><span style="">::</span><span style="">new</span><span style="">(</span><span style="color:#e6db74">&#34;my_hostname&#34;</span><span style="">.</span><span style="">to_string</span><span style="">())));</span><span style="">
</span><span style=""></span><span style="color:#66d9ef">let</span><span style=""> </span><span style="">_</span><span style=""> </span><span style="color:#f92672">=</span><span style=""> </span><span style="">email_client</span><span style="">.</span><span style="">smtp_command</span><span style="">(</span><span style="">
</span><span style=""> </span><span style="">MailCommand</span><span style="">::</span><span style="">new</span><span style="">(</span><span style="">Some</span><span style="">(</span><span style="">EmailAddress</span><span style="">::</span><span style="">new</span><span style="">(</span><span style="color:#e6db74">&#34;user@example.com&#34;</span><span style="">.</span><span style="">to_string</span><span style="">())),</span><span style=""> </span><span style="">vec</span><span style="color:#f92672">!</span><span style="">[])</span><span style="">
</span><span style=""> </span><span style="">);</span><span style="">
</span><span style=""></span><span style="color:#66d9ef">let</span><span style=""> </span><span style="">_</span><span style=""> </span><span style="color:#f92672">=</span><span style=""> </span><span style="">email_client</span><span style="">.</span><span style="">smtp_command</span><span style="">(</span><span style="">
</span><span style=""> </span><span style="">RcptCommand</span><span style="">::</span><span style="">new</span><span style="">(</span><span style="">EmailAddress</span><span style="">::</span><span style="">new</span><span style="">(</span><span style="color:#e6db74">&#34;user@example.org&#34;</span><span style="">.</span><span style="">to_string</span><span style="">()),</span><span style=""> </span><span style="">vec</span><span style="color:#f92672">!</span><span style="">[])</span><span style="">
</span><span style=""> </span><span style="">);</span><span style="">
</span><span style=""></span><span style="color:#66d9ef">let</span><span style=""> </span><span style="">_</span><span style=""> </span><span style="color:#f92672">=</span><span style=""> </span><span style="">email_client</span><span style="">.</span><span style="">smtp_command</span><span style="">(</span><span style="">DataCommand</span><span style="">);</span><span style="">
</span><span style=""></span><span style="color:#66d9ef">let</span><span style=""> </span><span style="">_</span><span style=""> </span><span style="color:#f92672">=</span><span style=""> </span><span style="">email_client</span><span style="">.</span><span style="">message</span><span style="">(</span><span style="">Box</span><span style="">::</span><span style="">new</span><span style="">(</span><span style="color:#e6db74">&#34;Test email&#34;</span><span style="">.</span><span style="">as_bytes</span><span style="">()));</span><span style="">
</span><span style=""></span><span style="color:#66d9ef">let</span><span style=""> </span><span style="">_</span><span style=""> </span><span style="color:#f92672">=</span><span style=""> </span><span style="">email_client</span><span style="">.</span><span style="">smtp_command</span><span style="">(</span><span style="">QuitCommand</span><span style="">);</span></code></pre>
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mermaid.initialize({ startOnLoad: true });
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